Synthesis of Ecofriendly Self-crosslinking Adhesive and Its Application in Pigment Printing

Glycidyl acrylate was synthesized successfully utilizing phase - transfer catalyst and was applied to emulsion polymerization of acrylates as the crosslinking agent. Combined with other two kinds of crosslinking agents, a new type of ecofriendly self - crosslinking adhesive was prepared . Factors affecting the preparation such as reaction temperature, initiator, eniulsifiers, reaction time and so on were studied comprehensively. Properties in relation to pigment printing of the prepared adhesives were also tested and compared with two kinds of commercial adhesives that have been widely applied in printing industry.

Synthesis and characterization of in-chain silyl-hydride functional SBR and self-crosslinking elastomer

Functional in-chain silyl-hydride （Si-H） SBR copolymers of 4-vinyiphenyldimethylsilanol （VPDMS） and butadiene were synthesized by living anionic polymerization, in which active group Si-H was not lost and its content was controllable. Corresponding self-crosslinking elastomers were obtained by hydrosilation of Si-H group with vinyl bonds in chain. The copolymers and elastomers were characterized by 1a NMR, size exclusion chromatography （SEC）, Fourier transform infrared （FTIR） spectroscopy, differential scaskning calorimetry （DSC）, and thermogravimetry analysis （TGA） techniques.

A self-crosslinking,double-functional group modified bacterial cellulose gel used for antibacterial and healing of infected wound

Cellulose/chitosan composite,as a mature commercial antibacterial dressing,is an important type of wound repair material.However,how to achieve the perfect compound of two components and improve antibacterial activity is a major,lingering issue.In this study,a bifunctional group modified bacterial cellulose(DCBC)was prepared by carboxymethylation and selective oxidation.Further,the chitosan(CS)was compounded in the network of DCBC by self-crosslinking to form dialdehyde carboxymethyl bacterial cellulose/chitosan composites(S-DCBC/CS).The aldehyde group can react with amino of CS by Schiff base reaction.The carboxyl group of DCBC and the amorphous distribution of CS molecular chains increase the antimicrobial properties of com-posites.The bacteriostatic rate of composites could be higher than 95%.Bacteria can be attracted onto the surface of composites,what we call it“directional adhesion antibacterial effects”.In particular,a kind of large animal wound model,deep II degree infected scald of Bama miniature pig,was used to research the antimicrobial and healing properties of materials.The S-DCBC/CS can effectively inhibit bacterial proliferation of wound and kill the bacteria.The wound healing rate of S-DCBC/CS was up to 80%after three weeks.The composites show better antibacterial and promoting concrescence effects than traditional chitosan dressings.

Temperature difference-enhanced salinity gradient energy conversion enabled by thermostable hydrogel membrane with anti-swelling property

Coupling low-grade heat(LGH)with salinity gradient is an effective approach to increase the efficiency of the nanofluidic-membrane-based power generator.However,it is a challenge to fabricate membranes with high charge density that ensures ion permselectivity,while maintaining chemical and mechanical stability in this composite environment.Here,we develop a bis[2-(methacryloyloxy)ethyl]phosphate(BMAP)hydrogel membrane with good thermal stability and anti-swelling property through self-crosslinking of the selected monomer.By taking advantage of negative space charge and three-dimensional(3D)interconnected nanochannels,salinity gradient energy conversion efficiency is substantially enhanced by temperature difference.Theoretical and experimental results verify that LGH can largely weaken the concentration polarization,promoting transmembrane ion transport.As a result,such a hydrogel membrane delivers high-performance energy conversion with a power density of 11.53 W·m^(−2)under a negative temperature difference(NTD),showing a 193%increase compared with that without NTD.

A Novel GEL-OHA/HAp Bone Substitute

Self-crosslinked gelatin-oxidized hyaluronic acid/hydroxyapatite（GEL-OHA/HAp） composite bone substitute was successfully prepared with a novel in situ precipitation method without using any toxic chemical cross-linkers,and its characterizations,including elemental composition,surface morphology,crystallinity,and structure of crystalline phase,were carried out. In order to evaluate its corresponding performances,comparisons with glutaraldehyde crosslinked gelatin/hydroxyapatite（GEL-Glu/HAp） composite were made in detail. The results indicate that nano-HAp crystallites are homogeneously dispersed in both GEL-OHA/HAp and GEL-Glu/HAp composites,and the HAp crystallites in the former take larger particle size than those in the latter. Mechanical property tests show the acceptable mechanical strength at high strain of GEL-OHA/HAp composite. Study of in vitro degradation and swelling demonstrate that the two composites have similar degradation rate and water absorption capability.By in vitro cell culture,it has been found out that the cells on the GEL-OHA/HAp composite show higher proliferative potential than the cells on the GEL-Glu/HAp composite. Compared with GEL-Glu/HAp composite,GEL-OHA/HAp composite provides an excellent strategy for preparation of non-toxic bone substitute with acceptable corresponding properties.