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Effects of Polyhedral Oligomeric Silsesquioxane (POSS) on Thermal and Mechanical Properties of Polysiloxane Foam

Authors
  • Zhang, Chunling
  • Zhang, Jinrui
  • Xu, Tianlu
  • Sima, Haofei
  • Hou, Jiazi
Type
Published Article
Journal
Materials
Publisher
MDPI AG
Publication Date
Oct 14, 2020
Volume
13
Issue
20
Identifiers
DOI: 10.3390/ma13204570
PMID: 33066577
PMCID: PMC7602122
Source
PubMed Central
Keywords
Disciplines
  • Article
License
Green

Abstract

The thermal and mechanical properties of polysiloxane foam are greatly improved by the addition of acrylolsobutyl polyhedral oligomeric silsesquioxane (MA0701, hereinafter referred to as MAPOSS), which has double bonds. The morphologies and properties of the polysiloxane composite foam were characterized. The average cell diameter of the composite foams decreased, while the cell density increased with increasing MAPOSS. Meanwhile, MAPOSS can enhance thermal conductivity and thermal stability. Thermal conductivity increased by 25%, and the temperature at the maximum weight loss rate increased from 556 °C to 599 °C. In addition, MAPOSS also promoted heterogeneous nucleation by functioning as a nucleating agent, which can increase cell density to improve the mechanical properties. The compressive strength of the composite foam increased by 170% compared with that of pure foam. In the composite, MAPOSS increased the cross-linking density by acting as a physical cross-linking point and limited the movement of the segments.

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