摘要
脂肪族聚酮(POK)是乙烯和一氧化碳的交替共聚物,具有优异的力学强度、阻隔性、耐磨性等优势,可用于制造纤维、薄膜和注塑制品。POK是一种可降解工程塑料,目前,对其结晶行为的研究仍有限。采用差示扫描量热仪(DSC)研究了POK的非等温结晶的过程。分别用Ozawa方程和莫志深方法对其非等温结晶的过程进行描述。运用Kissinger方程计算了POK的非等温结晶活化能。研究结果表明,随着结晶温度的升高,POK晶体由倾向于二维的盘状生长转变为三维的球形生长。同时,由于POK的强分子间相互作用,其结晶活化能仅为253.2 k J/mol,低于高密度聚乙烯,冷却过程中的半结晶时间也小于HDPE。POK的快速结晶对加工提出了更高的技术要求。
Aliphatic polyketone(POK)is an alternating copolymer of ethylene and carbon monoxide.It has excellent mechanical strength,barrier and wear-resisting properties.It can be used to fabricate the fiber,film and injection products.POK is a new kind of degradable engineering plastics.At present,the research on its crystallization behavior is still limited.Differential scanning calorimetry(DSC)was used to investigate the non-isothermal crystallization of POK from melt crystallization at different cooling rates.The process of non-isothermal crystallization was described by the Ozawa equation and the Mo method,respectively.The non-isothermal crystallization activation energy was calculated by the Kissinger equation.The results showed that as the crystallization temperature increased,the aliphatic polyketone crystals changed from a two-dimensional disk-like growth to a three-dimensional spherical growth.At the same time,it was found that the aliphatic polyketone has lower activation energy(253.2 k J/mol)and faster crystallization rate than high density polyethylene,due to the strong chains interactions.
作者
陈加强
徐睿杰
谢嘉宜
黄恒辉
田子钦
雷彩红
CHEN Jiaqiang;XU Ruijie;XIE Jiayi;HUANG Henghui;TIAN Ziqin;LEI Caihong(Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter,Guangdong Provincial Engineering Laboratory of Energy Storage Materials and Devices,School of Materials and Energy,Guangdong University of Technology,Guangzhou,Guangdong 510006,China)
出处
《塑料》
CAS
CSCD
北大核心
2021年第1期127-130,134,共5页
Plastics
基金
国家自然科学基金(51773044,51603047)
广东省自然科学基金博士启动项目(2016A030310344)。
关键词
脂肪族聚酮
非等温结晶动力学
相对结晶度
结晶活化能
结晶速率
aliphaticpolyketone
non-isothermal crystallization kinetics
relativecrystallinity
crystallization activation energy
crystallization rate
