摘要
采用共混造粒法制备了含0.5%纳米银的聚丙烯抗菌切片,利用差示扫描量热(DSC)法研究了聚丙烯及纳米银改性聚丙烯的非等温结晶行为及其动力学。结果表明,纳米银的加入使聚丙烯非等温结晶过程的成核自由能降低。Avrami方程能正确地描述聚丙烯及纳米银改性聚丙烯的非等温结晶过程。加入纳米银以后,材料的成核机理和晶体生长几何基本没有变化。聚丙烯和纳米银改性聚丙烯的Avrami指数的平均值分别为4.01和4.28,表明二者在非等温结晶时均以三维球晶方式生长。
Polypropylene antibacterial chips containing 0.5wt% nano-silver were prepared by blending and gra-nulation.The nonisothermal crystallization behavior and crystallization kinetics of polypropylene and nano-silver modified polypropylene were investigated by differential scanning calorimetry.The results show that the nucleation free energy of polypropylene was decreased with the addition of nano-silver during the nonisothermal crystallization process.The Avrami equation could describe nonisothermal crystallization of polypropylene and nano-silver modified polypropylene very well.Their nucleation mechanism and geometry of crystal growth remained almost unchanged with the addition of nano-silver.The Avrami exponent n of polypropylene and nano-silver modified polypropylene were around 4.01 and 4.28 respectively,indicating that their spherulites all deve-loped in three-dimentional field.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2012年第12期1516-1518,1523,共4页
Journal of Functional Materials
基金
国家自然科学基金面上资助项目(30872534)
重庆市科技攻关计划资助项目(CSTC
2010AB5116)
关键词
纳米银
聚丙烯
非等温结晶
结晶动力学
nano-silver
polypropylene
nonisothermal crystallization
crystallization kinetics
