Tag: M.W=200-250

Taplan, Christian published the artcileCovalent Adaptable Networks Using β-Amino Esters as Thermally Reversible Building Blocks, Quality Control of 1761-71-3, the publication is Journal of the American Chemical Society (2021), 143(24), 9140-9150, database is CAplus and MEDLINE.

In this study, β-amino esters, prepared by the aza-Michael addition of an amine to an acrylate moiety, are investigated as building blocks for the formation of dynamic covalent networks. While such amino esters are usually considered as thermally nondynamic adducts, the kinetic model studies presented here show that dynamic covalent exchange occurs via both dynamic aza-Michael reaction and catalyst-free transesterification. This knowledge is transferred to create β-amino ester-based covalent adaptable networks (CANs) with coexisting dissociative and associative covalent dynamic exchange reactions. The ease, robustness, and versatility of this chem. are demonstrated by using a variety of readily available multifunctional acrylates and amines. The presented CANs are reprocessed via either a dynamic aza-Michael reaction or a catalyst-free transesterification in the presence of hydroxyl moieties. This results in reprocessable, densely crosslinked materials with a glass transition temperature (T_g) ranging from -60 to 90°C. Moreover, even for the low T_g materials, a high creep resistance was demonstrated at elevated temperatures up to 80°C. When addnl. β-hydroxyl group-containing building blocks are applied during the network design, an enhanced neighboring group participation effect allows reprocessing of materials up to 10 times at 150°C within 30 min while maintaining their material properties.

Journal of the American Chemical Society published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C10H9NO4S, Quality Control of 1761-71-3.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Cao, Junya published the artcileRu/g-C₃N₄ as an efficient catalyst for selective hydrogenation of aromatic diamines to alicyclic diamines, Synthetic Route of 1761-71-3, the publication is RSC Advances (2020), 10(28), 16515-16525, database is CAplus and MEDLINE.

A series of Ru/g-C₃N₄ materials with highly dispersed Ru were firstly prepared by an ultrasonic impregnation method using carbon nitride as a support. The catalysts were characterized by various techniques including BET and elemental anal., ICP-AES, XPS, XRD, CO₂-TPD and TEM. The results demonstrated that Ru/g-C₃N₄ materials with a mesoporous structure and highly dispersed Ru were successfully prepared The chemo-selective hydrogenation of p-phenylenediamine (PPDA) to 1,4-cyclohexanediamine (CHDA) over Ru/g-C₃N₄ as a model reaction was investigated in detail. PPDA conversion of 100% with a CHDA selectivity of more than 86% could be achieved under mild conditions. It can be inferred that the carbon nitride support possessed abundant basic sites and the Ru/g-C₃N₄-T catalysts provided suitable basicity for the aromatic ring hydrogenation. Compared to the N-free Ru/C catalyst, the involvement of nitrogen species in Ru/g-C₃N₄ remarkably improved the catalytic performance. In addition, the recyclability of the catalyst demonstrated that the aggregation of Ru nanoparticles was responsible for the decrease of the catalytic activity. Furthermore, this strategy also could be expanded to the selective hydrogenation of other aromatic diamines to alicyclic diamines.

RSC Advances published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C13H26N2, Synthetic Route of 1761-71-3.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Giuntoli, Andrea published the artcileSystematic coarse-graining of epoxy resins with machine learning-informed energy renormalization, COA of Formula: C13H26N2, the publication is npj Computational Materials (2021), 7(1), 168, database is CAplus and MEDLINE.

Abstract: A persistent challenge in mol. modeling of thermoset polymers is capturing the effects of chem. composition and degree of crosslinking (DC) on dynamical and mech. properties with high computational efficiency. We established a coarse-graining (CG) approach combining the energy renormalization method with Gaussian process surrogate models of mol. dynamics simulations. This allows a machine-learning informed functional calibration of DC-dependent CG force field parameters. Taking versatile epoxy resins consisting of Bisphenol A diglycidyl ether combined with curing agent of either 4,4-Diaminodicyclohexylmethane or polyoxypropylene diamines, we demonstrated excellent agreement between all-atom and CG predictions for d., Debye-Waller factor, Young’s modulus, and yield stress at any DC. We further introduced a surrogate model-enabled simplification of the functional forms of 14 non-bonded calibration parameters by quantifying the uncertainty of a candidate set of calibration functions. The framework established provides an efficient methodol. for chem.-specific, large-scale investigations of the dynamics and mechanics of epoxy resins.

npj Computational Materials published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C13H26N2, COA of Formula: C13H26N2.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Tabuchi, Atsuko published the artcileSynthesis and Characterization of White-Light Luminescent End-Capped Polyimides Based on FRET and Excited State Intramolecular Proton Transfer, Application of 4,4-Diaminodicyclohexyl methane, the publication is Polymers (Basel, Switzerland) (2021), 13(22), 4050, database is CAplus and MEDLINE.

N-cyclohexylphthalimide-substituted trifluoroacetylamino (CF₃CONH-) group (3TfAPI), which forms an intramol. hydrogen bond, was synthesized, and it exhibited a bright yellow fluorescence owing to the excited-state intramol. proton transfer (ESIPT) in the solution and crystalline states. In addition, CF₃CONH-substituted phthalic anhydride (3TfAPA) was synthesized, which was attached to the termini of a blue-fluorescent semi-aromatic polyimide (PI) chain. Owing to the efficient Forster resonance energy transfer (FRET) occurring from the main chain to the termini and the suppression of deprotonation (anion formation) at the 3TfAPA moiety by H₂SO₄ doping, the resulting PI films display bright white fluorescence. Moreover, the enhancement of the chain rigidity by substituting the diamine moiety results in an increase in the quantum yield of white fluorescence (Φ) by a factor of 1.7, due to the suppression of local mol. motion. This material design strategy is promising for preparing thermally stable white-light fluorescent PIs applicable to solar spectral converters, displays, and ICT devices.

Polymers (Basel, Switzerland) published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C9H7NO2, Application of 4,4-Diaminodicyclohexyl methane.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Liu, Yingchun published the artcileUltrahigh thermal conductivity of epoxy composites based on curling bioinspired functionalized graphite films for thermal management application, Formula: C13H26N2, the publication is Composites, Part A: Applied Science and Manufacturing (2021), 106413, database is CAplus.

Unsatisfactory thermal conductive network (TCN) and poor heat conduction interface have limited thermal conductivity (TC) enhancement in the polymeric composites. In this study, inspired by mussels and a Chinese delicacy called the Hanamaki, a facile and environmental strategy is developed to prepare hierarchically ordered graphite film strips@polydopamine/epoxy (GFs@PDA/EP) composites. Organized TCNs and an optimized interface were constructed and thus an ultrahigh TC of GFs/EP (899.44 ± 18.51 W m^-1 K^-1) in perpendicular direction was obtained. Structural anal. and heat-transfer passages model suggests that superior TCNs were constructed and the designed structure is conducive for heat conduction in the perpendicular direction. Moreover, the interfacial bonding of GFs@PDA with EP matrix contributes to the remarkable enhancement of TC with increasing of PDA coverage. A decrease of ∼43°C in the thermal management experiment of LED chips indicated that it most likely becomes a good candidate in electronic device-cooling application.

Composites, Part A: Applied Science and Manufacturing published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C13H26N2, Formula: C13H26N2.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Yi, Pengcheng published the artcileSelf-Healable, Strong, and Tough Polyurethane Elastomer Enabled by Carbamate-Containing Chain Extenders Derived from Ethyl Carbonate, HPLC of Formula: 1761-71-3, the publication is Polymers (Basel, Switzerland) (2022), 14(9), 1673, database is CAplus and MEDLINE.

Com. diol chain extenders generally could only form two urethane bonds, while abundant hydrogen bonds were required to construct self-healing thermoplastic polyurethane elastomers (TPU). Herein, two diol chain extenders bis(2-hydroxyethyl) (1,3-pheny-lene-bis-(methylene)) dicarbamate (BDM) and bis(2-hydroxyethyl) (methylenebis(cyclohexane-4,1-diy-l)) dicarbamate (BDH), containing two carbamate groups were successfully synthesized through the ring-opening reaction of ethylene carbonate (EC) with 1,3-benzenedimetha-namine (MX-DA) and 4, 4′-diaminodicyclohexylmethane (HMDA). The two chain extenders were applied to successfully achieve both high strength and high self-healing ability. The BDM-1.7 and BDH-1.7 elastomers had high comprehensive self-healing efficiency (100%, 95%) after heated treatment at 60 °C, and exhibited exceptional comprehensive mech. performances in tensile strength (20.6 ± 1.3 MPa, 37.1 ± 1.7 MPa), toughness (83.5 ± 2.0 MJ/m³, 118.8 ± 5.1 MJ/m³), puncture resistance (196.0 mJ, 626.0 mJ), and adhesion (4.6 MPa, 4.8 MPa). The peculiar mech. and self-healing properties of TPUs originated from the coexisting short and long hard segments, strain-induced crystallization (SIC). The two elastomers with excellent properties could be applied to engineering-grade fields such as com. sealants, adhesives, and so on.

Polymers (Basel, Switzerland) published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C3H7NO2, HPLC of Formula: 1761-71-3.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Li, Zhen published the artcileDiscovery of Potent 3,5-Diphenyl-1,2,4-oxadiazole Sphingosine-1-phosphate-1 (S1P₁) Receptor Agonists with Exceptional Selectivity against S1P₂ and S1P₃, Related Products of quinuclidine, the publication is Journal of Medicinal Chemistry (2005), 48(20), 6169-6173, database is CAplus and MEDLINE.

A class of 3,5-diphenyl-1,2,4-oxadiazole based compounds have been identified as potent sphingosine-1-phosphate-1 (S1P₁) receptor agonists with minimal affinity for the S1P₂ and S1P₃ receptor subtypes. Analog 26 (S1P₁ IC₅₀ = 0.6 nM) has an excellent pharmacokinetics profile in the rat and dog and is efficacious in a rat skin transplant model, indicating that S1P₃ receptor agonism is not a component of immunosuppressive efficacy.

Journal of Medicinal Chemistry published new progress about 20029-52-1. 20029-52-1 belongs to quinuclidine, auxiliary class Carboxylic acid,Benzene, name is 4-Cyclohexylbenzoic acid, and the molecular formula is C13H16O2, Related Products of quinuclidine.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Liu, Zheng-Fei published the artcileUltralong lifetime room temperature phosphorescence and dual-band waveguide behavior of phosphoramidic acid oligomers, Computed Properties of 1761-71-3, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2020), 8(22), 7330-7335, database is CAplus.

Phosphoramidic acid is introduced into an oligomer matrix to construct a nonconjugated luminescence system with ultralong phosphorescence lifetimes up to 376.5 and 776.9 ms and high phosphorescence quantum yield (4.6-10.5%). At the same time, the new system also displays good thermo-processing properties, vitreous solid and optical waveguide behavior.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C13H26N2, Computed Properties of 1761-71-3.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Chen, Fengbiao published the artcileThe effect of latent plasticity on the shape recovery of a shape memory vitrimer, Name: 4,4-Diaminodicyclohexyl methane, the publication is European Polymer Journal (2021), 110304, database is CAplus.

The utility of covalent crosslinkers as permanent netpoints has enabled robust shape memory behavior in shape memory thermosets (SMTs). Having this permanent crosslinked structure, alternatively, challenges the reprogramming of permanent shapes. The introduction of vitrimeric type dynamic chem. into SMTs allows for reconfiguration of crosslinked network and thus reprogramming of permanent shapes. However, adding this adaptability/plasticity to the network could potentially affect the shape memory behavior, especially when the shape programming is conducted at a temperature that activates the network plasticity as well. Herein, to address the potential influence of network plasticity, we studied the shape memory behavior of a shape memory vitrimer (SMV) that possesses a low network activation energy (Ea) of 33 kJ/mol, which indicates a relatively high plasticity index during shape programming. As we found, there is a dependence of shape recovery on the shape-programming time: a longer programming time leads to a poorer shape recovery. This neg. correlation results from the dissipation of stored elastic energy at local strained regions associated with shape programming. We further related the loss of elastic energy to the stress-relaxation that results from chain exchanges. Accordingly, the dependence can be analyzed with an analog of stress-relaxation model.

European Polymer Journal published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C13H26N2, Name: 4,4-Diaminodicyclohexyl methane.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Song, Sam Cha published the artcileSynthesis and properties of waterborne polyurethane dispersions for surface coatings on poly(vinyl chloride), Formula: C13H26N2, the publication is Molecular Crystals and Liquid Crystals (2020), 706(1), 101-107, database is CAplus.

Recently, conventional solvent-typed polyurethanes are subject to many regulations due to emission of organic volatile compounds (VOCs) and researches have been focused on eco-friendly waterborne polyurethane dispersions (WPUDs) as an alternative of conventional solvent-typed ones causing poor working environment. PVC is widely used because of low price and good heat and fire resistance. To develop eco-friendly coatings on poly(vinyl chloride) (PVC), various WPUDs were synthesized by combination of polyol such as polyester, polycaprolactone, polyether or polycarbonate, hydrophilic compounds (dimethylol butanoic acid, DMBA), and reactive silicone. The structure and properties of synthesized WPUDs were characterized by FT-IR, particle size, contact angle, surface energy, tensile strength, elongation, and adhesion strength. Also, their particle sizes decreased while tensile strengths increased with increasing DMBA content. Surface energy and contact angle of WPUDs were strongly affected by the content of hydrophobic reactive silicone. The optimum properties of WPUDs were obtained by controlling their compositions, polyol, hydrophilic compound, and reactive silicone.

Molecular Crystals and Liquid Crystals published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C6H13BO3, Formula: C13H26N2.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider