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The Confined Crystallization of Hard Segments in Butylene Terephthalate-ε-Caprolactone Segmented Copolyesters
Cheng Xiaomin,Ma Dezhu,Luo Xiaolie
Author NameAffiliationE-mail
Cheng Xiaomin Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026 xmcheng@ahu.edu.cn  
Ma Dezhu Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026  
Luo Xiaolie Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026  
Abstract:
The confined crystallization of hard segments in butylene terephthalate-ε-caprolactone (PBT-PCL) copolyesters were carefully investigated by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction. Every copolyesters exhibits only one transition temperature Tg. The uncrystallized hard and soft segments form a relatively compatible amorphous phase. For those copolyesters with hard segment content higher than 50%, the hard segments can crystallize, while the soft segments can not. The soft segments confine the crystallization of hard segments. The crystallizability of hard segments increases with increasing hard segment sequence length.
Key words:  PBT-PCL copolyesters, Hard segment, Soft segment, Confined crystallization, Melting
FundProject:国家自然科学基金资助项目(29674026)
对苯二甲酸丁二酯-ε-己内酯多嵌段共聚物中硬链段的受限结晶
程晓敏*,马德柱,罗筱烈
摘要:
用差示扫描量热法(DSC),广角X射线衍射(WAXD),傅立叶变换红外光谱(FTIR)等技术研究了对苯二甲酸丁二酯-ε-己内酯(PBT—PCL)多嵌段共聚物中硬链段的受限结晶。结果表明,PBT—PCL共聚酯中软硬链段在非晶区的混容性比较好,不同组成的样品均显示出一个玻璃化转变温度;对硬段含量超过50%的共聚酯来说,硬链段可以结晶,而软链段不能结晶;由于硬链段的受限特点,BT硬链段的结晶受软链段的影响和制约,其结晶能力随硬段序列长度的增加而逐渐增大。
关键词:  PBT—PCL共聚酯  软段  硬段  受限结晶  熔融
DOI:10.1088/1674-0068/14/2/251-256
分类号: