Poly(styrene-glycidyl methacrylate) particles having bowl-shaped hollow structures were synthesized by swollen seed emulsion polymerization. The PS emulsion synthesized through soap-free emulsion polymerization was sw...Poly(styrene-glycidyl methacrylate) particles having bowl-shaped hollow structures were synthesized by swollen seed emulsion polymerization. The PS emulsion synthesized through soap-free emulsion polymerization was swollen by toluene, and then the mixture of second monomers was added under polymerization condition. So a thin shell of poly(styrene-glycidyl methacrylate) cross-linked by triethylene glycol diacrylate was formed around the swollen PS particle. The bowl-shaped particles were obtained after the collapsing of the thin shell when the toluene emanated from the particles, but the shapes were effected by the degrees of cross-linking. The shape of the particles was observed by SEM. The release behavior of solvent from the particles was examined by TG.展开更多
Iminodiacetic acid functionalized polyglycidyl methacrylate grafted-carbon fibers(PGMA-IDA/CFs) were prepared for Ni(II) removal from aqueous solutions. The effects of solution p H value, temperature and adsorption ti...Iminodiacetic acid functionalized polyglycidyl methacrylate grafted-carbon fibers(PGMA-IDA/CFs) were prepared for Ni(II) removal from aqueous solutions. The effects of solution p H value, temperature and adsorption time were investigated. The maximum adsorption capacity of Ni(II) on PGMA-IDA/CFs is 0.923 mmol·L-1· g-1at pH 5.2 and 50 °C. Kinetic data indicate that the adsorption process matches the pseudo-second-order model and Elovich kinetic model. Thermodynamic data suggest that the adsorption process is endothermic spontaneous reaction.展开更多
Although conventional suturing techniques are commonly used in assisting wound closure,they do pose limited conduciveness and may lead to secondary injury to wound tissues.Inspired by marine organism mussels,we design...Although conventional suturing techniques are commonly used in assisting wound closure,they do pose limited conduciveness and may lead to secondary injury to wound tissues.Inspired by marine organism mussels,we designed and manufactured a bio-inspired hydrogel-based bandage with tough wet tissue adhesion to substitute traditional surgical suture,accelerate wound healing and avoid infection.Poly(γ-glutamic acid)was modified with 3,4-dihydroxyphenylalanine and glycidyl methacylate,then introduced into the acrylic acid-co-acrylamide hydrogel matrix with robust mechanical properties.The hydrogel bandage showed strong chemical linkage adhesion(70±2.1 kPa),which is 2.8 times that of commercial tissue adhesive fibrin glue(25±2.2 kPa).The hydrogel bandage can not only maintain the self-stability,but is also capable of self-tuning adhesive strength in the range of 14-70 kPa to achieve different adhesion effects by tuning constituent ratio.The bandage has desirable compression properties(0.7±0.11 MPa)and tensile elongation(about 25 times),which ensures its resistance to damages,especially in joint spaces.Secondly,the bandage was endowed with antioxidant and endogenous broad-spectrum antibacterial properties with its catechol structure.Results also demonstrated excellent cell compatibility and blood compatibility,certifying its eligible biological safety profile.In a rat full-thickness cutaneous deficiency model,we can clearly observe that the bandage possesses the ability to promote wound healing(only need 6 days).Above all,this research provides a new strategy for the emergency treatment of liver hemostasis and myocardial repair during disaster rescue.展开更多
Hydrogel materials were prepared by thermopolymerization with different content of glyceryl methacrylate and hydroxyethyl methacrylate. The different states of water in swelling hydrogels were described and studied by...Hydrogel materials were prepared by thermopolymerization with different content of glyceryl methacrylate and hydroxyethyl methacrylate. The different states of water in swelling hydrogels were described and studied by differential scanning calorimetry(DSC). It was found that the hydrophilicity of GMA was stronger than HEMA,the water content and bound water of GMA hydrogel are higher than HEMA hydrogel.With the increase of GMA content, the content of free water in hydrogel increased. When GMA content was lower than 50%, the increase of GMA content also increased the content of bound water; but when GMA content was higher than 50%, the increase of GMA content decreased the content of bound water, which was caused by the chain hydrogen bond formed on the GMA chain with hydroxyl group each other.展开更多
文摘Poly(styrene-glycidyl methacrylate) particles having bowl-shaped hollow structures were synthesized by swollen seed emulsion polymerization. The PS emulsion synthesized through soap-free emulsion polymerization was swollen by toluene, and then the mixture of second monomers was added under polymerization condition. So a thin shell of poly(styrene-glycidyl methacrylate) cross-linked by triethylene glycol diacrylate was formed around the swollen PS particle. The bowl-shaped particles were obtained after the collapsing of the thin shell when the toluene emanated from the particles, but the shapes were effected by the degrees of cross-linking. The shape of the particles was observed by SEM. The release behavior of solvent from the particles was examined by TG.
基金Supported by the National Natural Science Foundation of China(21076054 and U140710231)the Natural Science Important Foundation of Educational Commission of Anhui Province(2010AJZR-85,2011AJZR-87)+1 种基金Study Foundation of New Product and Technology of Anhui Economic and Information Technology Commission(2012AHST0797,2013CXSY327 and 2013CXSY366)National College Student Innovation Fund(2014CXCY321 and 2014CXCY349)
文摘Iminodiacetic acid functionalized polyglycidyl methacrylate grafted-carbon fibers(PGMA-IDA/CFs) were prepared for Ni(II) removal from aqueous solutions. The effects of solution p H value, temperature and adsorption time were investigated. The maximum adsorption capacity of Ni(II) on PGMA-IDA/CFs is 0.923 mmol·L-1· g-1at pH 5.2 and 50 °C. Kinetic data indicate that the adsorption process matches the pseudo-second-order model and Elovich kinetic model. Thermodynamic data suggest that the adsorption process is endothermic spontaneous reaction.
基金supported by the National Natural Science Foundation of China(31771049)the Foundation of Key R&D Project of Jiangsu Province(BE2018731)+3 种基金the Research Foundation of State Key Laboratory of Materials-Oriented Chemical Engineering(ZK201806,KL18-06 and ZK201606)the Six Talent Peaks Project of Jiangsu Province(SWYY-046)the Natural Science Foundation of Jiangsu Province(BK20200682)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(SJCX20_0408).
文摘Although conventional suturing techniques are commonly used in assisting wound closure,they do pose limited conduciveness and may lead to secondary injury to wound tissues.Inspired by marine organism mussels,we designed and manufactured a bio-inspired hydrogel-based bandage with tough wet tissue adhesion to substitute traditional surgical suture,accelerate wound healing and avoid infection.Poly(γ-glutamic acid)was modified with 3,4-dihydroxyphenylalanine and glycidyl methacylate,then introduced into the acrylic acid-co-acrylamide hydrogel matrix with robust mechanical properties.The hydrogel bandage showed strong chemical linkage adhesion(70±2.1 kPa),which is 2.8 times that of commercial tissue adhesive fibrin glue(25±2.2 kPa).The hydrogel bandage can not only maintain the self-stability,but is also capable of self-tuning adhesive strength in the range of 14-70 kPa to achieve different adhesion effects by tuning constituent ratio.The bandage has desirable compression properties(0.7±0.11 MPa)and tensile elongation(about 25 times),which ensures its resistance to damages,especially in joint spaces.Secondly,the bandage was endowed with antioxidant and endogenous broad-spectrum antibacterial properties with its catechol structure.Results also demonstrated excellent cell compatibility and blood compatibility,certifying its eligible biological safety profile.In a rat full-thickness cutaneous deficiency model,we can clearly observe that the bandage possesses the ability to promote wound healing(only need 6 days).Above all,this research provides a new strategy for the emergency treatment of liver hemostasis and myocardial repair during disaster rescue.
文摘Hydrogel materials were prepared by thermopolymerization with different content of glyceryl methacrylate and hydroxyethyl methacrylate. The different states of water in swelling hydrogels were described and studied by differential scanning calorimetry(DSC). It was found that the hydrophilicity of GMA was stronger than HEMA,the water content and bound water of GMA hydrogel are higher than HEMA hydrogel.With the increase of GMA content, the content of free water in hydrogel increased. When GMA content was lower than 50%, the increase of GMA content also increased the content of bound water; but when GMA content was higher than 50%, the increase of GMA content decreased the content of bound water, which was caused by the chain hydrogen bond formed on the GMA chain with hydroxyl group each other.
