二苯亚甲基山梨醇对PET扩链体系发泡性能的影响  

The effect of crystal nucleating agents sorbitol on foaming performance of extended polyethylene terephthalates

作　　者：郭亚峰[1] 信春玲[1,2] 杨兆平[1] 何亚东[1,2] 

机构地区：[1]北京化工大学机电工程学院,北京100029 [2]教育部高分子材料加工装备工程研究中心,北京100029

出　　处：《分析试验室》2015年第7期855-861,共7页Chinese Journal of Analysis Laboratory

摘　　要：选用二苯亚甲基山梨醇(DMDBS)为结晶成核剂,采用哈克转矩流变仪研究了其对聚对苯二甲酸乙二醇酯(PET)与均苯四甲酸二酐(PMDA)间扩链反应的影响。采用旋转流变仪、广角X射线衍射仪(XRD)、差示扫描量热仪(DSC)及扫描电镜(SEM)研究了其通过分子自组装形成的网络结构对PET结晶性能和流变性能的影响。利用间歇发泡装置,对PET/DMDBS体系进行发泡实验,研究了PET/DMDBS体系发泡性能。DMDBS的加入能够改善PET的黏弹性,提高PET的结晶温度和结晶度、降低了熔融温度、拓宽了熔融峰范围、细化了晶粒尺寸。DMDBS的添加能够显著改善PET的发泡性能,发泡温区向高温方向拓宽。其中DMDBS含量为0.5%时,在272℃得到了发泡倍率最大为20倍的发泡PET;DM DBS质量分数为1.0%和1.5%时即使温度达到292℃,依然能够得到泡孔密度在1×108个/cm3,泡孔直径在55μm以下发泡制品。In this paper 1,3 ： 2,4-bis （3,4-dimethylbenzylidene） sorbitol （DMDBS） was used as crystal nucleating agents. The Haake torque rheometer were used to study the effect of DMDBS on chain-extension reaction between polyethylene terephthalates （PET） and Pyromellitic dianhydride （PMDA）. XRD, DSC and SEM were used to discuss the influence of DMDBS self-assembled network on crystallization properties and rheological properties of PET/DMDBS blends. The PET/DMDBS blends were foamed by a batch reactor to study the foaming pccformance. As the result indicated, the viscoelasticity improved, in addition the grain sizereduced, the crystallinity increased, the crystallization peak temperature also increased, the mehing temperature reduced, and the range of melting peak was broad. With the addition of DMDBS, the foaming performance of PET improved significantly, the foaming temperature of PET widened to high temperature. When the concentration of DMDBS was 0. 5%, the highest expansion ratio （21） PET foam was obtained with tempterature at 272℃. When the concentration of DMDBS was 1.0% or 1.5%, even the temperature reach 292℃, the cell density of PET/DMDBS blends remained above 1.0 ×10^8 cell/cm3 , and the average cell diameter was less than 55 μm.

关 键 词：聚对苯二甲酸乙二醇酯 山梨醇 结晶成核剂 自组装网络 发泡 

分 类 号：TQ321[化学工程—合成树脂塑料工业]