P3HB4HB/OA生物可降解共混物非等温结晶研究  

Study on Non-Isothermal Crystallization Kinetics of P3HB4HB/OA Biodegradable Blend Acids

作　　者：李祎 程宏达 韩常玉[2] LI Yi;CHENG Hong-da;HAN Chang-yu(School of Materials Science and Engineering,Jilin Jianzhu University,Changchun 130118,China;Key Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China)

机构地区：[1]吉林建筑大学材料科学与工程学院,吉林长春130118 [2]中国科学院长春应用化学研究所,中国科学院生态环境高分子材料重点实验室,吉林长春130022

出　　处：《塑料科技》2021年第3期60-65,共6页Plastics Science and Technology

摘　　要：通过熔融共混法制备了可生物降解聚(3-羟基丁酸酯-co-4-羟基丁酸酯)(P3HB4HB)/乳清酸(OA)共混物。利用差示扫描量热法(DSC)研究了OA含量对P3HB4HB非等温结晶行为的影响。分析表明,OA可作为成核剂提高P3HB4HB的结晶速率,结晶半衰期(t_(1/2))随着OA含量增加而减小。SEM分析表明:OA颗粒均匀地分散在P3HB4HB基质中。共混体系的结晶动力学通过Avrami、Ozawa和Mo方程进行分析。其中,Ozawa方法不适合描述此共混体系。Avrami方程参数说明OA不改变P3HB4HB的晶体生长方式和成核机理,只增加其成核和生长速率。Friedman结果表明,OA降低了P3HB4HB的结晶活化能,从而促进了P3HB4HB的结晶。Biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate)(P3HB4HB)/orotic acid(OA)blends were prepared by using melt blending processing techniques.The effects of OA content on the non-isothermal crystallization behavior of P3HB4HB were studied by using differential scanning calorimetry(DSC).The analysis data suggested that OA served as effective heterogeneous nucleating agent to increase the crystallization rate of P3HB4HB.The half-life crystallization(t_(1/2))of the blends decreased with the increase of the OA content.Scanning electron microscope(SEM)observation indicated that the OA particles were uniformly dispersed in the P3HB4HB matrix.The non-isothermal crystallization kinetics were analyzed by Avrami,Ozawa and Mo's equations,respectively.The Ozawa equation was not suitable for the non-isothermal crystallization of this blend system.Avrami equation parameters revealed that OA did not change the crystal growth mode and nucleation mechanism of P3HB4HB,but only increased its nucleation and growth rate.The activation energies for crystallization of P3HB4HB and its blends were further evaluated by Friedman equation.OA decreased the crystallization activation energy of P3HB4HB,which promoted the crystallization of P3HB4HB.

关 键 词：乳清酸(OA) 聚(3-羟基丁酸酯-co-4-羟基丁酸酯)(P3HB4HB) 成核剂 非等温结晶动力学 

分 类 号：TQ32[化学工程—合成树脂塑料工业] TB332[一般工业技术—材料科学与工程]