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High Mechanical Properties of Stretching Oriented Poly(butylene succinate) with Two-Step Chain Extension

Authors :
Xun Li
Min Xia
Xin Dong
Ren Long
Yuanhao Liu
Yiwan Huang
Shijun Long
Chuanqun Hu
Xuefeng Li
Source :
Polymers, Vol 14, Iss 9, p 1876 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

The structure, morphology, fracture toughness and flaw sensitivity length scale of chain-extended poly(butylene succinate) with various pre-stretch ratios were studied. PBS modification adopted from a multifunctional, commercially available chain-extension containing nine epoxy groups (ADR9) as the first step chain extension and hydroxyl addition modified dioxazoline (BOZ) as the second step. Time-temperature superposition (TTS) studies show that the viscosity increased sharply and the degree of molecular branching increased. Fourier transform infrared spectroscopy (FT-IR) confirm successful chain extension reactions. The orientation of the polymer in the pre-stretch state is such that spherulites deformation along the stretching direction was observed by polarized light optical microscopy (PLOM). The fracture toughness of sample (λfix = 5) is Γ ≈ 106 J m-2 and its critical flaw sensitivity length scale is Γ/Wc ≈ 0.01 m, approximately 5 times higher than PBS without chain-extension (Γ ≈ 2 × 105 J m-2 and Γ/Wc ≈ 0.002 m, respectively). The notch sensitivity of chain-extended PBS is significantly reduced, which is due to the orientation of spherulites more effectively preventing crack propagation. The principle can be generalized to other high toughness material systems.

Details

Language :
English
ISSN :
20734360
Volume :
14
Issue :
9
Database :
Directory of Open Access Journals
Journal :
Polymers
Publication Type :
Academic Journal
Accession number :
edsdoj.37b87bbfd14f45a8cd39a871c04f06
Document Type :
article
Full Text :
https://doi.org/10.3390/polym14091876