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The Morphological Structure and Multiphase Transitions of Segmented Polyesteramide
Li Guang*,Gaymans R J,Yang Shenlin,Jiang Jianming
Author NameAffiliationE-mail
Li Guang* State Key Lab. for Modification of Chemical Fibers and Polymer MaterialsDonghua UniversityShanghai 200051 lig@dhu.edu.cn 
Gaymans R J Department of Chemical TechnologyUniversity of TwenteP. O. Box2177500 AEEnschedeThe Netherlands  
Yang Shenlin State Key Lab. for Modification of Chemical Fibers and Polymer MaterialsDonghua UniversityShanghai 200051  
Jiang Jianming State Key Lab. for Modification of Chemical Fibers and Polymer MaterialsDonghua UniversityShanghai 200051  
Abstract:
Segmented polyesteramides have been synthesized from N,N'-bis(p-carbomethoxybenzoy)butanediamine(T4T)as crystalline segments and mixture of poly(tetramethylene oxide)with the average molecular weight 1000(PTMO1000)and 1,5-pentanediol(PDO)as soft segments. The polymerization was carried out in the melt at 250℃ for 1-2 h while vacuum was applied. The chemical composition of the copolymer was measured by H1-NMR. The melting behavior of the copolymers was studied by the differential scanning calorimeter. The dynamic mechanical properties were investigated on injection moulded bars by means of dynamic mechanical analysis. It was found that the copolymers with more than 40% molar ratio PDO showed two glass transition temperatures and two melting temperatures. The glass transition temperatures are independent of composition,and thus two fully phaseseparated amorphous phases are present. The melting temperatures change with PDO content. The amount of PDO has an effect on both TmA and TmB . TmA is attributed to the lamella consisting of extended T4T segments,while TmB results from the much thicker lamella consisting of both extended T4T and PDO segments. It is also possible that some PDO is present in the interphase as adjacent re-entry groups. So the resultant copolymer shows that a complex system,two crystalline phases,two amorphous phases and an interphase are involved in the copolymer. The undercooling for these copolymers is small,which means that these segmented copolymers crystallize fast.
Key words:  Polyesteramides,Melting behavior,Glass transition,Morphological structure
FundProject:
共聚聚醚酯酰胺的多重转变及其相态结构
李光*,GaymansRJ,杨胜林,江建明
摘要:
以自行合成的N,N’-双(对甲酯基苯甲酰)丁二胺(T4T)为硬段,市售平均分子质量为1000的聚氧丁撑(PTMO1000)和1,5-戊二醇(PDO)的混合体系为软段,制备出了PTMO1000 / PDO 不同摩尔比的一系列共聚聚醚酯酰胺(T4T-PTMO1000 / PDO). 应用H1-NMR分析了单体T4T 的化学组成及纯度,用差示扫描量热法(DSC)、动态力学分析(DMA)研究了共聚物的熔融转变及玻璃化转变,发现当PDO含量超过40%摩尔分数时,共聚物显示出两个玻璃化转变和两个熔融转变,并且两个玻璃
关键词:  聚醚酯酰胺  玻璃化转变  熔融转变  相态结构
DOI:10.1088/1674-0068/17/1/105-110
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