摘要
分别通过扫描电镜(SEM)、差式扫描量热分析(DSC)、X射线衍射(XRD)、热重分析(TG)、核磁共振及红外光谱等研究相容剂种类、含量及聚对苯二甲酸乙二醇酯(PET)/聚乳酸(PLA)配比对PET/PLA共混物的断面形貌、结晶形态及热性能等的影响。SEM和DSC结果表明,相容剂乳酸/丁二醇共聚物(PLLA-g-BDO)及用量对PET/PLA共混物的界面相容影响较大。与未加相容剂比,相容剂使界面从清晰过渡到模糊,界面处未见明显团聚颗粒;相容剂用量为8%时,DSC曲线上仅出现1个熔融峰。DSC和XRD表明,相容剂的引入降低了共混物的结晶度,冷结晶和热结晶过程中分别结晶,结晶的温度范围较宽,热结晶的结晶度大于冷结晶。冷结晶时,柔性链的PLA先结晶,PET后结晶;热结晶时,结晶温度较大组分PET先结晶,PLA后结晶。TG分析表明PET/PLA配比是材料热稳定性的必要条件。
Crystal and phase morphology, thermal properties of poly(ethylene terephthalate) and poly(lactic acid) blends with reactive compatilizer types, contents and different ratio for PET/PLA were investigated by SEM, DSC, XRD, TG, 1H-NMR and FT-IR etc. Results of SEM and DSC show that (PLLA-g-BDO) compatilizer types and contents have better influences on the interface compatibility of PET/PLA blends. With addition of compatilizer, there is a dramatic shift from clear to fuzzy with no obvious reunion particles for the phase, and an unique melting peak in DSC curve appears at the optimum mass of 8% compatilizer. DSC and XRD confirm that they will crystallize individually as cooling from melt, but crystallinity of the latter is more than the former, which reduce the whole crystallinity at a wide range crystallization temperature. When cooled, PLA component with flexible chain will crystallize first; simultaneously, PET component at higher crystallization temperature will crystallize first when melted. TG indicates that the PET/PLA ratio is necessary for thermal stability of materials.
作者
邱丽清
刘杭忠
赵升云
刘瑞来
Liqing Qiu, Hangzhong Liu, Shengyun Zhao, Ruilai Liu(College of Ecology and Resources Engineering, Fujian Provincial Bamboo Engineering Technology Research Center, Fujian Key Laboratory of Eco-Industrial Green Technology, Wuyi University, Wuyishan 354300, Chin)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2018年第3期73-80,共8页
Polymer Materials Science & Engineering
基金
福建省教育厅资助项目(JAT160516)
福建省科技厅项目(2016H0031)
关键词
共混物
相容剂
断面形貌
结晶形态
热性能
blend
compatilizer
phase morphology
crystal morphology
thermal property