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Enhanced foaming behaviors and compression properties of thermoplastic polyurethane via constructing micro-crosslinking structure assisted by chain extender

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Abstract

Thermoplastic polyurethane (TPU) foams are favorable for their elasticity and compression performance. However, high shrinkage rate, low expansion ratio, and insufficient compression performance greatly limit its application. In this work, to prepare the desired TPU foam and to gain insight into the influence of micro-crosslinking structure on their effect, cross-linked TPU foams were prepared and subsequently foamed by supercritical CO2 foaming technology. Effects of micro-crosslinking structure on the rheological and foaming behavior of samples were systematically investigated. Rheological results indicated that the introduction of a chain extender in the TPU matrix increases the branching degree of molecular chain. Compared with pure sample, the expansion ratio of composite foam increased from 3.5 to 6.5 and specific compressive strength from 3.19 to 11.81 MPa.

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Funding

This work is financially supported by the National Natural Science Foundation of China (No. 51403110), the Natural Science Foundation of Zhejiang Province (No. LY19E030003), the Natural Science Foundation of Ningbo City (No. 202003N4104), and K.C. Wong Magna Fund in Ningbo University.

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Authors and Affiliations

  1. Ningbo Key Laboratory of Specialty Polymers, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, China

    Hui-Tong Zhuang & Li Zhang

  2. Ningbo University, Ningbo, China

    Jin-Biao Bao

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  1. Hui-Tong Zhuang
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  2. Li Zhang
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  3. Jin-Biao Bao
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Correspondence to Li Zhang.

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Zhuang, HT., Zhang, L. & Bao, JB. Enhanced foaming behaviors and compression properties of thermoplastic polyurethane via constructing micro-crosslinking structure assisted by chain extender. Colloid Polym Sci 300, 851–859 (2022). https://doi.org/10.1007/s00396-022-04960-8

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  • DOI: https://doi.org/10.1007/s00396-022-04960-8

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