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A PDMS elastomer based on acylhydrazone groups with both acid- and heat-assisted self-healing properties was successfully prepared from tetra-acylhydrazine-terminated PDMS and terephthalaldehyde through solution casting. The good healing performance was obtained with catalytic acetic acid for 24 h at 25 °C or by annealing at 120 °C for 2 h. The elastomer exhibited a reversible transition near 80 °C...
Main-chain/side-chain combined liquid crystalline polymers (MCSCLCPs) are usually difficult to synthesize and their degrees of polymerization are relatively low, which bring difficulties in studying their structure–property relationships. In order to solve this problem, we prepared a new series of MCSCLCPs containing mesogen-jacketed liquid crystalline polymer (MJLCP) main chains via hydrogen-bonding...
The conformations of binary nanoparticles (NPs) in semiflexible polymer brushes under compression are investigated by molecular dynamics simulations, and a migration phenomenon of large NPs in semiflexible polymer brushes is observed in our simulation. For flexible polymer brushes, small NPs disperse freely within polymer brushes and large NPs tend to be located at the brush interface during the compression...
Poly(butylene fumarate) (PBF) bearing reactive double bonds on the polymer main chains has been designed and synthesized by coupling with hexamethylene diisocyanate (HDI) under very mild condition. The chemical structure, conformational structure, crystal structure and molecular weight of PBF were systematically characterized by ATR-FTIR, 1 H NMR, 13 C NMR, GPC and WARD. The thermal...
We use molecular dynamics method (MD) combined with multi-particle collision dynamics (MPCD) method to investigate the effects of poiseuille flow on the conformations and migration behaviors of semiflexible chains confined in two infinite flat planes. At low shear rates, the semiflexible chain keeps semirigid conformation in the plane parallel to the infinite flat wall. At high shear rates, the semiflexible...
Several novel chiral side-chain liquid crystalline (LC) polysiloxane resins containing epoxy groups and mesogenic components have been graft copolymerized by a one-step hydrosilylation reaction with poly(methylhydrogeno)siloxane, an epoxy monomer 2-(allyloxymethyl)oxirane, and chiral fluorinated liquid-crystalline monomers 4′-(4-(allyloxy)benzoyloxy)biphenyl-4-yl 6-(perfluorooctanoyloxy)hexahydrofuro[3,2-b]furan-3-yl...
Star poly(amido amine)-b-poly(ɛ-caprolactone)-b-poly(d-gluconamidoethyl methacrylate) (PAMAM–PCL–PGAMA) block copolymers with a dendrimer core were synthesized from the ring-opening polymerization of ɛ-caprolactone using a hydroxyl-terminated dendrimer poly(amido amine) initiator followed by the direct atom transfer radical polymerization of unprotected glycomonomer. The self-assembly and the biomolecular...
5,15-Bis(4-aminophenyl)-10,20-diphenylporphyrin (trans-DATPP) was synthesized via the condensation of meso-(4-nitrophenyl)dipyrromethane and benzaldehyde. The further reaction with zinc acetylacetonate hydrate afforded zinc 5,15-bis(4-aminophenyl)-10,20-diphenylporphyrin (trans-ZnDATPP). A series of soluble polyimides based on trans-DATPP or trans-ZnDATPP, 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl...
A series of newly designed polyimides, composed of aromatic polyimide backbones and methylene side chains with terminal 4-cyanobiphenyl groups, were synthesized based on the polycondensation of 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA) with 2,2′-bis{ω-[4-(4-cyanophenyl)phenyoxy-n-alkoxycarbonyl]}-4,4′-biphenyl diamine (nCBBP, where n is the number of methylene units in the side chains)...
The effect of the imide unit on the isothermal and non-isothermal crystallization, kinetics crystallization of a new family of copoly(ethylene terephthalate-imides) (called copolyesterimides or PETIs) was investigated using differential scanning calorimetry. With a combined Avrami and Ozawa equation, one can describe the non-isothermal crystallization process of copolyesterimides, and the results...
Crystallization kinetics of copoly(ethyleneterephthalate-imide)s (PETIs) of various imide contents were studied by the DSC technique. The results of isothermal and nonisothermal crystallization kinetics studies showed a consistent trend in that the crystallization of all copolyesterimides comprised a primary stage and secondary stage, and that the crystallization mechanism was a three-dimensional...
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