取向聚丙烯片材熔融重结晶行为研究  

Study on Melt Recrystallization Behavior of Oriented Polypropylene Sheet

作　　者：张冯倩 初立秋[1] 高达利[1] 张师军[1] 侴白舸 李书亮 Zhang Fengqian;Chu Liqiu;Gao Dali;Zhang Shijun;Chou Baige;Li Shuliang(SINOPEC(Beijing)Research Institute of Chemical Industry Co.,Ltd.,Beijing,100013)

机构地区：[1]中石化(北京)化工研究院有限公司,北京100013

出　　处：《现代塑料加工应用》2024年第2期9-12,共4页Modern Plastics Processing and Applications

摘　　要：采用差示扫描量热法(DSC),广角X射线衍射(WAXD)等方法研究了取向聚丙烯(PP)片材的熔融重结晶行为。结果表明:熔融过程的残余晶体、重结晶产生的新晶体晶型和取向方向均未发生变化,均为α晶且沿着机器方向(MD)取向。熔融重结晶过程中熔融峰值温度和结晶度随着停留温度(T_(s))升高先升高后逐渐降低。当T_(s)低于155.0℃时处于退火区,取向PP片材晶体整体的框架结构依然存在。当T_(s)大于169.0℃时取向PP片材完全熔化。当T_(s)在155.0~168.0℃时处于自成核区,部分未熔化的晶体碎片构成了晶核,并在冷却过程中产生了结晶,且新晶体沿着残余晶体的方向取向。The melt recrystallization behavior of oriented polypropylene(PP)sheet was studied by differential scanning calorimetry(DSC),wide-angle X-ray diffraction(WAXD)and other methods.The results show that the forms and orientation directions of residual crystals during the melting process and the new crystals generated by recrystallization have not changed,both of which areαcrystal oriented along the machine direction(MD).During the process of melt recrystallization,the peak melting temperature and crystallinity first increase and then gradually decrease with the increase of the residence temperature(T_(s)).When T_(s) is below 155.0℃,the oriented PP sheets are in the annealing region,and the overall framework structure of the crystals still exists.When T_(s) is above 169.0℃,the oriented PP sheets are completely melted.When T_(s) is from 155.0 to 168.0℃,the oriented PP sheets are in the self-nucleation region,some unmelted crystal fragments form the crystal nuclei and re-crystallization occurs during the cooling process,with the new crystals oriented along the direction of the residual crystals.

关 键 词：取向聚丙烯 熔融 重结晶 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]