As a non-toxic,highly reactive biomass material,gelatin is wildly used as the component of biomass-based adhesive.However,like most aqueous adhesives,gelatin-based adhesives suffer from long solidifying time or high s...As a non-toxic,highly reactive biomass material,gelatin is wildly used as the component of biomass-based adhesive.However,like most aqueous adhesives,gelatin-based adhesives suffer from long solidifying time or high solidifying temperature due to the low volatility of water,which highly limits the application potential of gelatinbased adhesives.Inspired by the fast adhesion of marine organisms through the formation of chemical crosslinks,herein,a kind of low temperature curable eco-friendly gelatin-based adhesive with good adhesive properties and fast curing at low temperature is developed by introducing clicking chemical Diels-Alder(DA)reaction between blocked waterborne polyurethane(MWPU)and gelatin.The furfuryl glycidyl ether(FGE)and 4-Maleimidophenol(4-HPM)for the DA reaction are grafted on gelatin,and the end-capping of MWPU,respectively.With the addition of MWPU and FGE,the cross-linking degree of gelatin increased,and the adhesion properties of the adhesive were improved.The shear strength and T-peel strength of the modified adhesive reached 0.95 MPa and 1.42 N/mm,respectively,after the curing time of 8 min at 40℃,which can meet the application requirements as adhesive for bio-medical use.展开更多
Composite aerogel based on sodium carboxymethyl cellulose(CMC-Na)and chitosan(CS),i.e.,CS/CMC-Na,was prepared through a sol-gel method.Then,CS/CMC-Na was used for simulating the adsorption of metal ions(Cr^(3+),Al^(3+...Composite aerogel based on sodium carboxymethyl cellulose(CMC-Na)and chitosan(CS),i.e.,CS/CMC-Na,was prepared through a sol-gel method.Then,CS/CMC-Na was used for simulating the adsorption of metal ions(Cr^(3+),Al^(3+)and Zr^(4+))produced by the tanning industry.The ad-sorption process is consistent with the Langmuir isotherm adsorption model and pseudo-second order kinetics.The maximum fitted adsorption capacities of Cr^(3+),Al^(3+),and Zr^(4+)could reach 250.0,111.1,and 100.0 mg/g,respectively.After metal ion adsorption,the obtained composite materials(CS/CMC-Na-Cr^(3+),CS/CMC-Na-Al^(3+),and CS/CMC-Na-Zr^(4+))were used as re-tanning agents in the re-tanning process to leather.The re-tanning agent could increase the shrinkage temperature of leather by up to 5℃.Compared with the traditional method,the method utilized in this study achieved the integration of mental ions-containing wastewater treatment and waste adsorbent/adsorbates recycling.展开更多
Conductive hydrogels show great promise in the field of flexible bioelectronics,but their complex synthesis process and insufficient safety limit practical applications.Starch,as a natural polysaccharide,is an ideal c...Conductive hydrogels show great promise in the field of flexible bioelectronics,but their complex synthesis process and insufficient safety limit practical applications.Starch,as a natural polysaccharide,is an ideal candidate for bio-based conductive materials due to its processability,biocompatibility,and degradability.This review summarizes the research progress of starch-based conductive materials,elucidates their synthesis mechanisms,and elaborates on the methods for imparting conductivity to starch and their application advancements in the conductive materials.Especially,the review emphasizes the high compatibility between starchbased materials and biological tissues and focuses on different design methods of starch-based conductive hydrogels,highlighting their respective advantages and disadvantages.Then,the properties and applications of starch-based conductive hydrogels in wearable sensors,supercapacitors,batteries,and other biomedical-related devices were summarized emphatically.Meanwhile,this review also objectively examined the current challenges,focusing on the difficulties in enhancing the performance of starchbased conductive hydrogels,reducing production costs,and scaling up manufacturing.Overall,these analyses were conducted to guide the further development of conductive hydrogels toward greener and more sustainable practices.展开更多
基金the financial support from the National Natural Science Foundation of China(22002079,2207081675,and 22108165)the Natural Science Basic Research Program of Shaanxi(Program No.2021JQ-548).
文摘As a non-toxic,highly reactive biomass material,gelatin is wildly used as the component of biomass-based adhesive.However,like most aqueous adhesives,gelatin-based adhesives suffer from long solidifying time or high solidifying temperature due to the low volatility of water,which highly limits the application potential of gelatinbased adhesives.Inspired by the fast adhesion of marine organisms through the formation of chemical crosslinks,herein,a kind of low temperature curable eco-friendly gelatin-based adhesive with good adhesive properties and fast curing at low temperature is developed by introducing clicking chemical Diels-Alder(DA)reaction between blocked waterborne polyurethane(MWPU)and gelatin.The furfuryl glycidyl ether(FGE)and 4-Maleimidophenol(4-HPM)for the DA reaction are grafted on gelatin,and the end-capping of MWPU,respectively.With the addition of MWPU and FGE,the cross-linking degree of gelatin increased,and the adhesion properties of the adhesive were improved.The shear strength and T-peel strength of the modified adhesive reached 0.95 MPa and 1.42 N/mm,respectively,after the curing time of 8 min at 40℃,which can meet the application requirements as adhesive for bio-medical use.
基金financial support of the Science and Technology Project of Quanzhou City(No.2024G03)Na-tional Natural Science Foundation of China(No.22478235)+1 种基金National Natural Science Foundation of China(No.22078183No.22108165).
文摘Composite aerogel based on sodium carboxymethyl cellulose(CMC-Na)and chitosan(CS),i.e.,CS/CMC-Na,was prepared through a sol-gel method.Then,CS/CMC-Na was used for simulating the adsorption of metal ions(Cr^(3+),Al^(3+)and Zr^(4+))produced by the tanning industry.The ad-sorption process is consistent with the Langmuir isotherm adsorption model and pseudo-second order kinetics.The maximum fitted adsorption capacities of Cr^(3+),Al^(3+),and Zr^(4+)could reach 250.0,111.1,and 100.0 mg/g,respectively.After metal ion adsorption,the obtained composite materials(CS/CMC-Na-Cr^(3+),CS/CMC-Na-Al^(3+),and CS/CMC-Na-Zr^(4+))were used as re-tanning agents in the re-tanning process to leather.The re-tanning agent could increase the shrinkage temperature of leather by up to 5℃.Compared with the traditional method,the method utilized in this study achieved the integration of mental ions-containing wastewater treatment and waste adsorbent/adsorbates recycling.
基金supported by the Opening Project of State Key Laboratory of Polymer Materials Engineering(Sichuan University)(Grant Number.sklpme2024-1-02)National Natural Science Foundation of China(22108165)the“Scientists+Engineers”Talent Team Construction Project of Xianyang City(L2024-CXNL-KJRCTD-DWJS-0003).
文摘Conductive hydrogels show great promise in the field of flexible bioelectronics,but their complex synthesis process and insufficient safety limit practical applications.Starch,as a natural polysaccharide,is an ideal candidate for bio-based conductive materials due to its processability,biocompatibility,and degradability.This review summarizes the research progress of starch-based conductive materials,elucidates their synthesis mechanisms,and elaborates on the methods for imparting conductivity to starch and their application advancements in the conductive materials.Especially,the review emphasizes the high compatibility between starchbased materials and biological tissues and focuses on different design methods of starch-based conductive hydrogels,highlighting their respective advantages and disadvantages.Then,the properties and applications of starch-based conductive hydrogels in wearable sensors,supercapacitors,batteries,and other biomedical-related devices were summarized emphatically.Meanwhile,this review also objectively examined the current challenges,focusing on the difficulties in enhancing the performance of starchbased conductive hydrogels,reducing production costs,and scaling up manufacturing.Overall,these analyses were conducted to guide the further development of conductive hydrogels toward greener and more sustainable practices.
