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In general, the strength of injection molded objects increases with shear layer thickness or shish-kebab content. However, the effect of the change of the position of shear layer and spherulites layer on the mechanical properties is still unclear, when their thickness are fixed. To answer this question, a novel multilayer structure in which the shear layer mainly containing shish-kebab structure and...
Bio-based materials from Cardanol/cardol with episulfide group (CCES) and epoxy group (CCEO) were synthesized and further blended with commercial bisphenol-A diglycidyl ether type epoxy resin (DGEBA) for anti-corrosion coating application. The curing behavior of CCEO and CCES confirmed that episulfide exhibited a faster curing rate and higher curing conversion than epoxide. Anticorrosion properties...
Two donor–acceptor polymer semiconductors based on highly electron-deficient pyrrolo[3,4-d]pyridazine-5,7-dione unit were synthesized by Stille cross-coupling polymerization, and their thermal property, photophysical property, electrochemical property, microstructure, application as organic thin-film transistors, and photovoltaic property were investigated. Because of the strong electron-accepting...
In the work, ethylene–octene copolymer (POE) toughened isotatic polypropylene (PP) blends with different phase morphologies and crystalline structures were successfully fabricated and their influence on the toughness of PP blends was discussed. POE domains not only played the role of stress concentration to induce stress field around them, but also acted as stress deliverer to transmit stress to the...
An allyl-containing bifunctional benzoxazine is synthesized from o-allylphenol, 4,4′-diaminodiphenyl ether, and formaldehyde, followed by isomerization in the presence of chlorotris(triphenylphosphine)rhodium(I)/triethylsilane catalytic system yielding a propenyl-containing benzoxazine, and the chemical structures of the two isomers are confirmed. In the thermal activated polymerization, both isomers...
In this study, a novel approach has been developed to introduce orientation to bundle-like β spherulite in iPP samples. The addition of UHMWPE phase, which plays the role of maintaining orientation of iPP chains, into β-nucleation agent nucleated iPP samples leads to the formation of oriented β spherulite in the inner region of injection molded samples. Accordingly, both the tensile strength and impact...
In this study, isotactic polypropylene (iPP) samples were prepared by conventional injection molding (CIM) and pressure vibration injection molding (PVIM), in which a periodical shear field was imposed on the iPP melt during the cooling solidification. The distribution of supermolecular structures of samples was investigated by Polarized Light Microscopy (PLM) and Scanning Electron Microscopy (SEM)...
Main chain bile acid polymers obtained via entropy-driven ring-opening metathesis are biodegradable polymers with excellent shape memory properties. X-ray scattering was used to study the conformational changes implicated in the shape memory effect of these polymers. Strain induced orientation and ordering was observed upon the drawing of the polymer films. A correlation between ordering and the shape...
Dual temperature- and pH-sensitive comb-type grafted cationic hydrogels are successfully synthesized by grafting polymeric chains with freely mobile ends, which are composed of both N-isopropylacrylamide (NIPAM) segments and N,N-dimethylamino ethyl methacrylate (DMAEMA) segments, onto the backbone of crosslinked poly(NIPAM-co-DMAEMA) networks. Equilibrium and dynamic swelling/deswelling properties...
A novel graft-type poly(N-isopropylacrylamide-co-acrylic acid) (poly(NIPAM-co-AAc)) microgel with linear grafted poly(NIPAM-co-AAc) side chains was prepared by incorporating the dual stimuli-responsive chains into conventional copolymerized poly(NIPAM-co-AAc) backbones as side chains through a grafted modification of molecular structure. The grafted chains with unfettered ends can unfold and shrink...
A cholic acid-imprinted polymer has been prepared by a hybrid imprinting method involving the use of a template-containing monomer, 3α-methacryloyl cholic acid methyl ester. The removal of the template can afford the polymer with cavities and carboxylic acid groups well positioned in these cavities for the specific binding of cholic acid via hydrogen bonding. The maximum binding capabilities for the...
Novel dual temperature- and pH-sensitive comb-type grafted poly(N-isopropylacrylamide-co-acrylic acid) (P(NIPAM-co-AAc)) hydrogels were successfully prepared by grafting PNIPAM chains with freely mobile ends onto the backbone of a cross-linked P(NIPAM-co-AAc) network. The prepared comb-type grafted P(NIPAM-co-AAc) hydrogels exhibited a more rapid deswelling rate than normal-type P(NIPAM-co-AAc) hydrogels...
The exploring theoretical investigation on Ti-substituted polysilane model, (Si 5 TiH 12 ) n , (Si 3 TiH 8 ) n and (SiTiH 4 ) n , has been performed by using density functional theory (DFT). Ti substitutions have little effect on geometrical structures. The characteristic IR band of Ti substitutions is at 1710–1760cm −1 . TDDFT...
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