采用乳液聚合方法将引发剂过硫酸铵(APS)和乳化剂十二烷基硫酸钠(SDS)制备出聚丙烯酸树脂乳液,再加入不同条件交联剂固化成聚丙烯酸(PAA)水凝胶,并探究使用紫外固化和热固化2种不同固化方式及不同固化时间对PAA水凝胶性能的影响。通过...采用乳液聚合方法将引发剂过硫酸铵(APS)和乳化剂十二烷基硫酸钠(SDS)制备出聚丙烯酸树脂乳液,再加入不同条件交联剂固化成聚丙烯酸(PAA)水凝胶,并探究使用紫外固化和热固化2种不同固化方式及不同固化时间对PAA水凝胶性能的影响。通过氮气等温吸脱附曲线测试(Brunauer-Emmet-Teller,BET)、扫描电子显微镜(scanning electron microscope,SEM)、热失重分析(thermogravimetric analysis,TGA)、溶胀度、力学测试等方法,对水凝胶的性能进行表征分析。结果表明,形成的PAA水凝胶主要为片状颗粒材料,在紫外固化20 min条件下,其孔径主要分布在2~4 nm;且在热固化条件下,当交联剂质量浓度为0.06、0.07 g/mL时PAA水凝胶溶胀度可达到667%,在交联剂质量浓度为0.09 g/mL时拉伸强度可达到60 k Pa。综上所述,对比紫外固化和热固化2种方法以及不同条件交联剂下制备的PAA水凝胶的差异,对理解和优化PAA水凝胶的制备具有一定的指导意义。展开更多
To improve the mechanical properties of bio-based poly(ethylene succinate),the sugar monomer isosorbide,whicli is relatively easy to obtain,was used as a copolymerized third monomer to synthesize poly(ethyleneco-isoso...To improve the mechanical properties of bio-based poly(ethylene succinate),the sugar monomer isosorbide,whicli is relatively easy to obtain,was used as a copolymerized third monomer to synthesize poly(ethyleneco-isosorbide succinate),a 100%biomass copolyester.The effects of isosorbide on the crystallinity and thermal properties of copolyester were studied by nuclear magnetic resonancefH NMR),differential scanning calorimeter(DSC),and thermogravimetric(TG).Owing to its distinct rigid bicyclic structure,isosorbide can improve the glass transition temperature of the copolyester and decrease the crystallization rate,as well as accelerate the hydrolysis of the copolyester.Simultaneously,the introduction of isosorbide can effectively improve the antistatic properties of copolyester.展开更多
文摘采用乳液聚合方法将引发剂过硫酸铵(APS)和乳化剂十二烷基硫酸钠(SDS)制备出聚丙烯酸树脂乳液,再加入不同条件交联剂固化成聚丙烯酸(PAA)水凝胶,并探究使用紫外固化和热固化2种不同固化方式及不同固化时间对PAA水凝胶性能的影响。通过氮气等温吸脱附曲线测试(Brunauer-Emmet-Teller,BET)、扫描电子显微镜(scanning electron microscope,SEM)、热失重分析(thermogravimetric analysis,TGA)、溶胀度、力学测试等方法,对水凝胶的性能进行表征分析。结果表明,形成的PAA水凝胶主要为片状颗粒材料,在紫外固化20 min条件下,其孔径主要分布在2~4 nm;且在热固化条件下,当交联剂质量浓度为0.06、0.07 g/mL时PAA水凝胶溶胀度可达到667%,在交联剂质量浓度为0.09 g/mL时拉伸强度可达到60 k Pa。综上所述,对比紫外固化和热固化2种方法以及不同条件交联剂下制备的PAA水凝胶的差异,对理解和优化PAA水凝胶的制备具有一定的指导意义。
文摘To improve the mechanical properties of bio-based poly(ethylene succinate),the sugar monomer isosorbide,whicli is relatively easy to obtain,was used as a copolymerized third monomer to synthesize poly(ethyleneco-isosorbide succinate),a 100%biomass copolyester.The effects of isosorbide on the crystallinity and thermal properties of copolyester were studied by nuclear magnetic resonancefH NMR),differential scanning calorimeter(DSC),and thermogravimetric(TG).Owing to its distinct rigid bicyclic structure,isosorbide can improve the glass transition temperature of the copolyester and decrease the crystallization rate,as well as accelerate the hydrolysis of the copolyester.Simultaneously,the introduction of isosorbide can effectively improve the antistatic properties of copolyester.