Effect of Block Number and Weight Fraction on the Structure and Properties of Poly(butylene terephthalate)-block-Poly(tetramethylene oxide) Multiblock Copolymers

• DOI: 10.1021/acs.macromol.0c02793
• Publication Date: 2021-03-02T17:26:50Z
• Authors: Hui Xie; Huanjun Lu; Zhilan Zhang; Xiaohong Li; Xiaoming Yang; Yingfeng Tu
• Keywords: Elongation

We report here the influence of block number and polyester weight fraction on properties a series poly(ether ester) multiblock copolymers (mBCPs), poly(butylene terephthalate)-block-poly(tetramethylene oxide) (PBT-b-PTMO-b-PBT)n, with same PTMO segment length. These mBCPs are double-crystalline polymers, where melting temperature crystallinity PBT increase fraction. The blocks undergo phase separation at room to form plausible bicontinuous disordered structure. With increment number, phase-separation-domain size decreased. As result, decreases, while strength elongation break significantly due enhancement bridging segments between different domains. enhances mBCPs' Young's modulus but decreases their break. Our results enrich understanding behavior mBCPs, structure–property relationship revealed would be useful for design elastomers desired properties.