THERMAL-MECHANICAL PROPERTIES AND RHEOLOGICAL BEHAVIORS OF POLYLACTIDE/POLY(ETHYLENE OXIDE) BLENDS

JIA Zhiyuan; HAN Changyu; DONG Lisong; YANG Yuming

doi:10.3724/SP.J.1105.2009.00967

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THERMAL-MECHANICAL PROPERTIES AND RHEOLOGICAL BEHAVIORS OF POLYLACTIDE/POLY(ETHYLENE OXIDE) BLENDS

Research Bulletin | 更新时间：2021-03-19

- THERMAL-MECHANICAL PROPERTIES AND RHEOLOGICAL BEHAVIORS OF POLYLACTIDE/POLY(ETHYLENE OXIDE) BLENDS
- Acta Polymerica Sinica Issue 9, Pages: 967-972(2009)
- 作者机构：
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- DOI：10.3724/SP.J.1105.2009.00967
  CLC：
- Published：20 September 2009，
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JIA Zhiyuan, HAN Changyu, DONG Lisong, YANG Yuming. THERMAL-MECHANICAL PROPERTIES AND RHEOLOGICAL BEHAVIORS OF POLYLACTIDE/POLY(ETHYLENE OXIDE) BLENDS. [J]. Acta Polymerica Sinica (9):967-972(2009)
DOI：

JIA Zhiyuan, HAN Changyu, DONG Lisong, YANG Yuming. THERMAL-MECHANICAL PROPERTIES AND RHEOLOGICAL BEHAVIORS OF POLYLACTIDE/POLY(ETHYLENE OXIDE) BLENDS. [J]. Acta Polymerica Sinica (9):967-972(2009) DOI： 10.3724/SP.J.1105.2009.00967.

摘要

采用熔融共混方法制备了聚乳酸与聚氧化乙烯的共混物.细致研究了重均分子量分别为2 kDa、10 kDa、100 kDa和600 kDa的聚氧化乙烯对聚乳酸的改性效果，并使用DSC、DMA及旋转流变仪等分析了共混物的相容性、热行为、力学性能和流变行为.结果表明，在聚氧化乙烯的组分含量不超过20 wt%的前提下，共混体系保持为完全相容体系，当聚氧化乙烯的分子量超过10 kDa时，其对聚乳酸的增塑效果，不随分子量增加而降低；增加聚氧化乙烯的分子量，可以提高材料的弹性模量和熔体强度.

Abstract

Polylactide (PLA)/poly(ethylene oxide) (PEO) blends were prepared by melt-mixing

and the influence of molecular weight of PEO on the thermal-mechanical properties and rheological behaviors of the blends was investigated.Four kinds of PEO with molecular weight of 2 kDa (PEG2)

10 kDa (PEG10)

100 kDa (PEO100) and 600 kDa (PEO600) were used in this study.It was found that all PEOs were miscible with PLA to an extent of ca. 20 wt% and their quenched blends were completely amorphous.The decrease of Tgshowed the plasticization effect of PEO on PLA.When the molecular weight of PEO was over 10 kDa

the plasticization effect was not dependence on the molecular weight of PEO

which did not decrease with the increase of molecular weight of PEO.Increasing the molecular weight of PEO can increase the tensile modulus and melt intensity of PLA/PEO blends

while the ductility of the blends was not decreased.All blends with 20 wt% PEO had a similar elongation at break of about 330%

but tensile moldulus of the blends changed from 250 MPa for the PLA/PEG2 blend to 550 MPa for the PLA/PEO600 blend.The rheology experiments indicated the G′increased significantly with the increase of molecular weight of PEO for the blends with same composition.

关键词

聚乳酸聚氧化乙烯增塑流变行为

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Related Institution

Key laboratory of Auxiliary Chemistry and Technology for Chemical Industry of Ministry of Education, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology

扬州大学化学化工学院

扬州大学江苏省环境工程与环境材料重点实验室

扬州大学测试中心

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