摘要
利用5L聚合釜,采用熔融聚合的方法合成了尼龙612/6共聚物,探究不同质量分数的己内酰胺(CPL)对尼龙612/6共聚物材料力学性能的影响,并通过端基滴定、切片含水率和X射线衍射(XRD)分析CPL添加量对尼龙612/6共聚物力学性能影响的原因;确定CPL的质贵分数为]5%时,尼龙612/6共聚物能够获得较佳的综合力学性能,与尼龙612相比,缺口冲击性能提高113%,断裂伸长率提高127%,拉伸强度下降 8%,弯曲强度下降28%;对尼龙612和质貴分数为15%CPL的尼龙612/6共聚物的等温结晶行为进行了研究,利用Avrami方程分析得出,Avrami指数n分别在2.02∽2.53和2. 23∽2.38之间,尼龙612和尼龙612/6共聚物的等温结晶过程均为二次成核,成核后沿着晶核二维盘状生长;利用Arrhenius方程求出两者的等温结晶活化能△E分别为-756. 38kJ/mol和-115. 09kJ/mol。
The nylon 612/6 copolymer was synthesized by melt polymerization using a 5L polymerizer. The effects of different mass fractions of caprolactam (CPL) on the mechanical properties of nylon 612/6 copolymer were investigated. The reasons for the influence of CPL addition on the mechanical properties of nylon 612/6 copolymer were determ ined by end group titration, section m oisture content and X-ray diffractionCXRD)test. T he m ass fraction of CPL was determ ined to be 15% nylon 612/6 copolymer can obtain better mechanical properties. Compared w ith nylon 612: the notched impact strength is improved by 113%;the elongation at break is increased by 127%;the tensile strength is decreased by 8%;the bending strength is decreased by 28%;and the isothermal crystallization behavior of nylon 612 and nylon 612/6 w ith a m ass fraction of 15% CPL was analyzed by Avrami equation. The Avrami index n was between 2.02∽2. 53 and 2. 23∽2. 38, respectively. Isotherm al crystallization process of nylon 612 and nylon 612/6 copolymers is secondary nucleation. A fter nucleation, it grows along the crystal nucleus in two dimensions. A t the same tim e, the Arrhenius equation is used to determine the isotherm al crystallization activation energy AE was 756.38kJ/mol and 115.09kJ/mol, respectively.
作者
产文涛
曲希明
俞昊
姜锋
金小培
于春晓
王金花
CHAN Wen-tao;QU Xi-ming;YU Hao;JIANG Feng;JIN Xiao-pei;YU Chun-xiao;WANG Jin-hua(State Key Laboratory for Modification of Chemical Fiber and Polymer Materials , College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;China Textile Academy , State Key Laboratory of Biobased Fiber Manufacturing Technology, Beijing 100025. China)
出处
《高分子通报》
CAS
CSCD
北大核心
2019年第7期44-51,共8页
Polymer Bulletin
