PEFT共聚酯序列结构的研究
Research on sequence structures of PEFT copolyester
黄洛玮 1钱齐嘉 2王树霞 3司虎 1郭颖 1张涛 1徐长宝1
作者信息
- 1. 中国石化仪征化纤有限责任公司研究院,江苏仪征 211900
- 2. 中央民族大学生命与环境科学学院,北京 100081
- 3. 中国石化仪征化纤有限责任公司研究院,江苏仪征 211900;江苏省高性能纤维重点实验室,江苏仪征 211900
- 折叠
摘要
为阐明聚(对苯二甲酸乙二醇-2,5-呋喃二甲酸乙二醇)共聚酯(PEFT)的结构,采用酯交换-熔融缩聚法,以 2,5-呋喃二甲酸二甲酯(DMFD)、对苯二甲酸二甲酯(DMT)和乙二醇(EG)为原料,合成了一系列不同组成的PEFT共聚酯.通过核磁共振氢谱(1 H NMR)表征共聚产物的分子结构、序列长度及DMFD-DMT共聚体系中各单体的竞聚率.结果表明,PEFT共聚物为嵌段结构,当共聚酯中聚 2,5-呋喃二甲酸乙二醇酯(PEF)链节摩尔含量在 25%以下时,PEFT分子中PEF序列长度小于 2;当PEF链节摩尔含量在 50%以上时,序列长度在 4.07 以上.在EG添加量不变的缩聚体系中,DMFD 组分竞聚率 r1=1.03,DMT 组分 r2=0.95,DMFD 倾向于与 EG 形成呋喃二甲酸-乙二醇(F-E)结构的均聚链段,DMT组分则倾向于与DMFD及EG形成对苯二甲酸-乙二醇-呋喃二甲酸-乙二醇(T-E-F-E)的共聚链段.
Abstract
A series of PEFT copolyesters were created using the transesterification-melt polycondensati-on method route employing dimethyl 2,5-furandicarboxylate(DMFD)and dimethyl terephthalate(DMT)in order to investigate the sequence structures of the polyethylene terephthalate-co-polyethylene furandicarboxylate(PEFT)copolyester.1 H NMR was used to characterize the sequence structures,length and reactivity ratio.Ac-cording to the findings,PEFT were block copolymers.The PEF sequence was less than 2 when the molar concen-tration of PEF chains in the copolyester was less than 25%.PEF was copolymerized with PET in the form of blocks with a sequence length greater than 4.07 when the molar content of PEF chains was greater than 50%.According to the reactivity ratio computation results,DMT r2=0.95 and DMFD r1=1.03.For homopolymerization with EG into the(F-E)structure,DMFD proved advantageous,while DMT component was beneficial for copolymeriza-tion with DMT and EG into(T-E-F-E)structure.
关键词
PEFT共聚/核磁共振/序列结构/嵌段/竞聚率Key words
PEFT copolyester/1 H NMR/sequence structure/block/reactivity ratio引用本文复制引用
出版年
2024
NETL
NSTL
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