预辐照线形低密度聚乙烯反应挤出接枝衣康酸的制备、表征及性能  

Preparation,Characterization and Property of Pre-irradiated Linear Low Density Polyethylene Grafted Itaconic Acid by Reactive Extrusion

作　　者：李文斐[1] 郑笑秋[1] 姚占海[2] 

机构地区：[1]长春理工大学化学与环境工程学院,吉林长春130022 [2]中国科学院长春应用化学研究所高分子物理与化学国家重点实验室,吉林长春130022

出　　处：《中国塑料》2007年第12期37-41,共5页China Plastics

摘　　要：以衣康酸(IA)为单体,利用β射线预辐照引发技术,采用反应型双螺杆挤出机制备了线形低密度聚乙烯接枝衣康酸(PE-LLD-g-IA)。利用傅里叶变换红外光谱和差热扫描量热法对PE-LLD-g-IA的结构和热性能进行了表征,用化学滴定法测定了PE-LLD-g-IA的接枝率,研究了预辐照剂量,衣康酸(IA)单体用量和反应温度对接枝率的影响,对接枝产物的力学性能和黏结性能进行了表征。结果发现:PE-LLD-g-IA在1712 cm^(-1)处有明显的羰基特征吸收峰,IA分子确实接枝到线形低密度聚乙烯(PE-LLD)分子链上;接枝率随单体浓度、预辐照剂量及挤出温度的增加而增加;与纯PE-LLD相比,PE-LLD-g-IA的结晶温度升高;接枝产物的力学性能无明显变化;接枝产物与金属铝的剥离强度达2.5 N/mm。The grafting of linear low density polyethylene （PE-LLD） with itaconic acid （IA） was achieved using β ray irradiation in a twin-screw extruder. The degree of grafting was determined using chemical titration method. The relationship between the structure and thermal properties of the grafted product （PE-LLD-g-IA） was characterized using Fourier transform infrared spectroscopy and differential scanning calorimetry. The effects of irradiation dose, monomer content, and extrusion temperature on degree of grafting were studied systematically. The mechanical properties and peeling strength of the graft copolymer were determined. The distinct peak at 1 712 cm^-1 on the FTIR spectrum of the copolymer was assigned to carbonyl groups, which was considered the proof of IA grafting. The degree of grafting increased with increasing monomer concentration, irradiation dose, and extrusion temperature. Compared with neat PE-LLD, the crystallization temperature of PE-LLD-g-IA increased, no obvious change was observed in the tensile strength and elongation at break after grafting. The peeling strength of PE-LLD-g-IA/A1 plate was 2.5 N/mm.

关 键 词：线形低密度聚乙烯 预辐照 接枝 衣康酸 反应挤出 

分 类 号：TQ325[化学工程—合成树脂塑料工业]