Viscosification properties of poly(butylene succinate) by melt polycondensation

doi:10.16085/j.issn.1000-6613.2023-1642

Abstract

Abstract:

In order to solve the problem of degradation and aging of biodegradable poly (butylene succinate) (PBS) during long-term normal storage, the molecular weight of PBS was improved by melt polycondensation. The viscosity, molecular weight, thermal properties and rheological properties of PBS were studied under various reaction temperatures, reaction time, initial viscosity and melt film thickness. The results showed that the molecular weight of PBS increased with the increasing of melt polycondensation temperatures. The intrinsic viscosity of PBS increased from 1.049dL/g to 2.072dL/g at 220℃ within 60min. The PBS sample possessed lower initial viscosity value indicated faster viscosity increasing rates. The thickness of PBS melt was inversely proportional to its viscosity increasing reaction rate. It was shown that the elevated viscosity values also led to a decrease of crystallization properties and melting point of PBS. The rheological test results showed that with the increase of viscosity, the melt strength and thermal stability of PBS increased, which can meet the needs of reprocessing and use. The melt re-polycondensation process can effectively solve the degradation problems of PBS being unable to meet its subsequent processing and using requirements.

Key words: polymers, polymerization, polymer processing, poly(butylene succinate), melt polycondensation, thermal performance, rheological performance

摘要：

为解决生物可降解聚丁二酸丁二醇酯（PBS）长期正常储存过程中易发生降解而导致分子量下降的难题，通过熔融缩聚增黏方法实现了PBS分子量的提升。研究了反应温度、反应时间、初始特性黏度以及熔体膜厚等对PBS特性黏度、分子量、热性能和流变性能的影响。结果表明：PBS分子量随熔融缩聚增黏温度升高而升高；220℃反应60min，PBS特性黏度即可从1.049dL/g升至2.072dL/g；PBS初始黏度越低其增黏速率越高；而PBS的熔体膜厚与其增黏反应速率呈反比；PBS特性黏度的升高导致结晶困难，进而使其熔点下降。流变测试结果表明随着特性黏度升高，PBS熔体强度与热稳定性均提升，能满足重新加工和使用的需求，通过熔融再聚合方法可有效解决PBS因降解而无法满足其后续加工和使用需求的难题。

关键词: 聚合物, 聚合, 聚合物加工, 聚丁二酸丁二醇酯, 熔融缩聚, 热性能, 流变性能

CLC Number:

TQ31

XU Tao, WANG Yongjun, LIN Qisong, DAI Junming, ZHA Quanliang, LYU Wangyang, CHEN Wenxing. Viscosification properties of poly(butylene succinate) by melt polycondensation[J]. Chemical Industry and Engineering Progress, 2024, 43(10): 5663-5670.

徐涛, 王勇军, 林启松, 戴钧明, 查全亮, 吕汪洋, 陈文兴. 聚丁二酸丁二醇酯熔融缩聚增黏特性[J]. 化工进展, 2024, 43(10): 5663-5670.

Figures/Tables 12

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增黏温度/℃	特性黏度/dL·g^-1	数均分子量/g·mol^-1	重均分子量/g·mol^-1	多分散系数	端羧基含量/mol·t^-1
200	1.109	23360	38860	1.664	28.20
210	1.891	42960	66680	1.552	18.77
220	2.072	45410	69200	1.524	15.27
230	3.093	63720	99850	1.567	12.68
240	3.234	78760	123900	1.573	13.21

增黏温度/℃	特性黏度/dL·g^-1	数均分子量/g·mol^-1	重均分子量/g·mol^-1	多分散系数	端羧基含量/mol·t^-1
200	1.109	23360	38860	1.664	28.20
210	1.891	42960	66680	1.552	18.77
220	2.072	45410	69200	1.524	15.27
230	3.093	63720	99850	1.567	12.68
240	3.234	78760	123900	1.573	13.21

增黏时间/min	特性黏度/dL·g^-1	数均分子量/g·mol^-1	重均分子量/g·mol^-1	多分散系数	端羧基含量/mol·t^-1
0	1.049	22800	38190	1.675	31.10
15	1.105	23700	38920	1.642	27.45
30	1.203	25500	41170	1.614	25.13
45	1.564	40920	64410	1.574	20.22
60	2.072	45410	69200	1.524	15.27
75	2.208	54130	83150	1.536	15.19

增黏时间/min	特性黏度/dL·g^-1	数均分子量/g·mol^-1	重均分子量/g·mol^-1	多分散系数	端羧基含量/mol·t^-1
0	1.049	22800	38190	1.675	31.10
15	1.105	23700	38920	1.642	27.45
30	1.203	25500	41170	1.614	25.13
45	1.564	40920	64410	1.574	20.22
60	2.072	45410	69200	1.524	15.27
75	2.208	54130	83150	1.536	15.19

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