纳米纤维素/聚己内酯的等温结晶动力学  

Isothermal Crystallization Kinetics of Nanocellulose/Polycaprolactone

作　　者：刘枫 吴鹏 张宇 柯洋 陈绪煌 毕斯雯 LIU Feng;WU Peng;ZHANG Yu;KE Yang;CHEN Xuhuang;BI Siwen(College of Materials and Chemical Engineering,Hubei University of Technology,Wuhan,Hubei 430068)

机构地区：[1]湖北工业大学,材料与化学工程学院,湖北武汉430068

出　　处：《塑料》2024年第3期184-188,共5页Plastics

摘　　要：利用差示扫描量热仪(DSC)研究了聚己内酯(PCL)与纳米纤维素复合材料的等温结晶动力学,采用了Avrami理论来解析结晶过程中成核和生长的动力学。研究结果表明,纳米纤维素(CNC)诱导PCL异相成核能有效提高PCL基体的结晶速率。在等温结晶过程中,相对分子质量为300和3000的聚乙烯亚胺(PEI)修饰的CNC(CNC-P1、CNC-P2)能够将PCL的半结晶时间由5.19 s降低至1.70和2.07 s。为研究修饰后CNC对PCL结晶结构的影响,结合Thomson-Gibbs方程和Lauritzen-Hoffman方程计算了PCL的折叠表面自由能和片晶厚度,结果表明,加入修饰后的CNC导致PCL的折叠表面自由能显著降低,分别由0.024 J/m^(2)降低至0.179 J/m^(2)和0.020 J/m^(2),片晶厚度由18.6 nm增大至20.2 nm和18.9 nm。修饰后的CNC对于PCL的等温结晶动力学及结晶特性均有显著的影响。The isothermal crystallization kinetics of polycaprolactone(PCL)and nanocellulose composite was investigated using differential scanning calorimetry(DSC),and Avrami theory was employed to resolve the kinetics of nucleation and growth during the crystallization process.The results showed that nanocellulose(CNC)induced PCL heterogeneous nucleation,which could effectively improve the crystallization rate of PCL matrix.The 300 and 3000 molecular weight polyethyleneimine(PEI)-modified CNC(CNC-P1,CNC-P2)were able to reduce the half-crystallization time of PCL from 5.19 s to 1.70 and 2.07 s during isothermal crystallization.In order to investigate more deeply the effect of modified CNC on the crystalline structure of PCL,the folded surface free energy and sheet crystal thickness of PCL were calculated by combining the Thomson-Gibbs and Lauritzen-Hoffman equations in this study,and it was found that the addition of modified CNC led to a significant decrease in the folded surface free energy of PCL,from 0.024 J/m^(2) to 0.179 and 0.179 J/m^(2),the sheet crystal thickness from 18.6 nm to 20.2 and 18.9 nm.Respectively.The modified CNC had a significant effect on the isothermal crystallization kinetics and crystallization properties of PCL.

关 键 词：聚己内酯 纳米纤维素 成核剂 等温结晶动力学 片晶厚度 

分 类 号：TQ323.41[化学工程—合成树脂塑料工业]