退火温度对β成核iPP薄膜微观结构和力学性能的影响  

Influence of Annealing Temperature on Microstructures and Mechanical Properties of β-nucleated Isotactic Polypropylene Films

作　　者：刘忠柱[1] 李广森[1] 付艳芹[1] 郑国强[1] 

机构地区：[1]郑州大学材料科学与工程学院材料成型及模具教育部重点实验室,河南郑州450001

出　　处：《现代塑料加工应用》2015年第4期10-12,共3页Modern Plastics Processing and Applications

基　　金：国家自然科学基金资助(基金号51173171)

摘　　要：通过挤出-拉伸法制备了等规聚丙烯(iPP)/稀土β成核剂(β-NA)薄膜,并在85℃和125℃下对薄膜进行退火。研究了退火温度对薄膜微观结构和力学性能的影响。采用二维广角X射线衍射、差示扫描量热法以及拉伸测试分别对其微观结构和力学性能进行了表征。结果表明:退火能促进薄膜的分子链运动并重排;长周期、片晶厚度随着退火温度的提高而增大;退火过程中发生β晶向α晶的转变;在125℃退火时,样品的应力-应变曲线上没有明显的屈服现象。Isotactic polypropylene （iPP）/rare earth D-nucleating agent （β-NA） films were prepared by extrusion stretching method,and then the films were annealed at 85 and 125 ℃,respectively. The effect of annealing temperatures on mierostructures and mechan- ical properties of the films was studied. The microstructures and mechanical properties of the films were characterized by 2D-WAXD, DSC and tensile test,respectively. The results show that annealing can enhance movement and rearrangement of molecular chains; and long period and lamella thickness increase with the increase of annealing temperatur. Dur- ing the annealing process, the phase transformation from the β-iPP to the α-iPP takes place; and there is no obvious yield phenomenon in the stress-strain curves of the sample annealed at 125 ℃.

关 键 词：等规聚丙烯 Β成核剂 薄膜退火温度 微观结构 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]