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Advances in hydrogel design are yielding new hydrogel materials with diverse macroscopic topological structures. Among these, hydrogel fibers have been considered as a new class of hydrogel material with unique spatiotemporal properties. In this study, based on the novel non-template dynamic-crosslinking-spinning (DCS) method which has been demonstrated for scalable fabrication of size-controllable...
Polymer blends comprising polypropylene, Nylon 6, and a compatibilizer were extruded and biaxially stretched. The as-extruded films with various compositions were characterized in terms of morphology, crystallization behavior, optical transparency, and oxygen barrier property. The blend films with all five compositions presented matrix-dispersed morphology with polypropylene as the continuous phase...
Organic-inorganic hybrid polymers based on poly(arylene ether sulfone) (PAES) containing multi-sulfonated polyhedral oligosilsesquioxane (POSS) pendants (PAES-sPOSS-x) were synthesized to improve the inorganic fillers' distribution in polymer matrix and to enhance the ion conductivity and swelling resistance of aromatic polymer electrolyte membrane. The synthesis of the graft hybrid polymers in this...
Biodegradable shape memory polymers are attractive materials for the design of biomedical scaffolds as they allow deploying implants remotely with minimal intervention, whilst allowing degradation and tissue repair. However, shape memory properties are difficult to design from common degradable polymers, without chemical modifications. Here were developed readily tunable processable shape memory polymer...
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...
We study the interactions between a cationic polypeptide chain with tunable hydrophobicity and a fluid phosphatidyl-choline lipid monolayer composed of neutral, tetravalent phosphatidylinositol 4, 5-bisphosphate and univalent phosphatidylserine acidic lipids at various ionic concentrations of the salt solution, using a simple coarse-grained Monte Carlo model. Our work illustrates that the enhancement...
Comb-like block copolymers PVSt-g-(PS-b-PE) (PVSt: poly(4-(vinylpheneyl)-1-butene)) with high grafting density were successfully synthesized based on “Graft onto” strategy. The grafting density of PVSt-g-(PS-b-PE) was 35–39% (branch chain number per 100 repeating units of the backbone). By introducing PS block in the side chains, the total PS volume fraction in the copolymers could be adjusted to...
Nonspherical poly(vinylidene fluoride)/poly(4-vinyl pyridine) (PVDF/P4VP) composite particles were prepared via a facile one-step soap-free seeded emulsion polymerization. A moderate amount of ammonia solution was introduced into the polymerization system to make the composite latex particles uniform and stable, possibly due to the prevention of P4VP nucleation in the aqueous phase. Depending upon...
We discovered important effects of chemically distinct initiator fragments incorporated at chain ends on the glass transition temperature (Tg) of poly(methyl methacrylate) (PMMA). Polymers of various molecular weight (MW) were synthesized via free radical polymerization (FRP) using 2,2’-azobis(2-methylpropionitrile) (AIBN) and benzoyl peroxide (BPO) as initiator. All samples have identical triad distribution...
Broader applications of polymer hydrogels are largely constrained by their poor mechanical performance. Here, we report our strategy of achieving ultrahigh mechanical strength, toughness, and self-healing properties simultaneously in a hybrid dual crosslinked polyacrylic acid (PAAc) hydrogel. The hybrid PAAc hydrogel was fabricated in a one-pot reaction with two types of crosslinking points, i.e....
Using salt-doped polystyrene-b-poly(2-vinylpyridine) star shaped block copolymer as a model, we show that the architecture of (A-b-B)n type multi-arm star block copolymers enhances the ordering of the block copolymers, enabling the generation of nanostructures with microdomain periods less than 10 nm. The influence of the arm number on the order-to-disorder transition temperature and molecular weight...
Two donor-π-acceptor (D-π-A) type low bandgap (LBG) conjugated polymers, namely, PT-DTNT-DT and PTT-DTNT-DT, consisting of thiophene (T) and/or thieno[3,2-b]thiophene (TT) as donor moiety, two flanking 2-decyltetradecylthienyl as π-bridges and large planarity and strong electron-withdrawing naphtho[1,2-c:5,6-c′]bis[1,2,5]thiadiazole (NT) as acceptor moiety have been developed and systematically investigated...
Novel fast-responding shape-memory polyurethanes were prepared from bio-based polyols, diphenyl methane diisocyanate and butane diol for the first time. The bio-based polyester polyols were synthesized from 9-hydroxynonanoic acid, a product obtained by ozonolysis of fatty acids extracted from soy oil and castor oil. The morphology of polyurethanes was investigated by synchrotron ultra-small angle...
A metal-free and efficient homodifunctional bimolecular ring-closure method was developed specifically for the formation of well-defined cyclic polyesters based on the combination of ring opening polymerization (ROP) and self-accelerating double strain-promoted azide-alkyne cycloaddition (DSPAAC) reaction. In this method, ROP and the following end group modification were used to prepare the azide-terminated...
A series of side-chain type poly(arylene ether sulfone)s (sPAE) bearing pendant 3,5-dimethylphenyl groups are prepared via high temperature polycondensation reaction of 4,4’-biphenol, 4,4'-difluorodiphenyl sulfone, and new difluoro aromatic ketone monomer, (2,6-difluorophenyl) [3-[(3,5-dimethylphenyl)methyl]-5-methylphenyl] methanone. The sPAE-based anion exchange membranes (sQPAE(x/y)) containing...
Alternating poly(lactide)/poly(ε-caprolactone) multiblock supramolecular polymers were synthesized by terminal functionalization of PLA-PCL-PLA triblock copolymers with the self-complementary quadruple hydrogen bonding of 2-ureido-4[1H]-pyrimidinone (UPy) dimers. The prepared supramolecular copolymers (SMPs) show the properties of thermoplastic elastomers, while the PLA-PCL-PLA is brittle solids,...
Ferroelectric composites, integrating dielectric ceramic fillers with mechanically flexible polymers, are promising materials for flexible electronic applications. Plenty of research has demonstrated the enhanced dielectric and ferroelectric properties of composite materials. However, the mechanisms responsible for these enhancements are not completely understood. Herein, we used typical dielectric...
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...
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...
Inorganic-organic hybrid membranes consisting of an aliphatic main-chain polymer and trisiloxane bond were synthesized using a simple, one-pot process from a trisiloxane derivative, phosphonic acid acrylate, and vinylbenzotriazole. 1,5-Divinyl-3-phenylpentamethyltrisiloxane (DPPMTS) was copolymerized with 2-hydroxyethyl methacrylate acid phosphate (HEMAP), and N-vinylbenzotriazole (VBT), yielding...
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