热处理对不同相对分子质量iPP挤出拉伸薄膜结晶行为的影响  

Effect of Heat Treatment on Crystallization Behaviors of Extruded iPP Stretching Films with Different Molecular Weight

作　　者：张典[1,2] 张晓黎[1,2] 王冰花[1,2] 陈静波[1,2] 申长雨[2] 

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450001 [2]郑州大学橡塑模具国家工程研究中心,河南郑州450002

出　　处：《高分子材料科学与工程》2015年第9期112-116,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(11172272;11372284);高等学校博士学科点专项科研基金项目(20104101110002);河南省自然科学基础研究项目(122300410278)

摘　　要：选用了3种不同相对分子质量及其分布的等规聚丙烯(iPP),使用Hakke挤出机制备iPP薄膜,然后在140℃,3%的小应变条件下对薄膜退火处理10min。利用广角X射线衍射、差示扫描量热仪和红外光谱衍射仪研究了小应变退火对不同相对分子质量iPP薄膜结晶行为和取向结构的影响。实验结果表明,小应变退火后3种相对分子质量样品的结晶度均有提高,用WAXD测试的结果分别由未退火前的59.53,60.40,66.48提高到68.48,68.56,68.74。晶相和非晶相的取向度相比未退火前也均有所提高。Three kinds of iPPs with different molecular weight and molecular weight distribution were selected and were extruded by Hakke extruder. The extruded stretching films were further heat-treated with a small strain of 3 % at 140 ℃ for 10 min. Wide angle X-ray diffraction （WAXD）, differential scanning calorimetry （DSC） and Fourier transform infrared spectroscopy （FT-IR） were used to detect the effects of annealing under the small strain on iPP crystallization behavior and the crystal structure orientation. The tested WAXD results reveal that the annealing at a lower strain level could improve the crystallinity of three molecular weight samples from 59.53, 60.40, 66.48 to 68. 48, 68.56, 68.74, respectively, and the orientations of both crystallized and amorphous phases are also increased compared to that before annealing.

关 键 词：等规聚丙烯 小应变 热处理 结晶度 取向 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]