差示扫描量热法
材料科学
热固性聚合物
玻璃化转变
复合材料
聚酰亚胺
断裂韧性
纳米压痕
热稳定性
韧性
光学显微镜
高分子化学
聚合物
扫描电子显微镜
化学工程
热力学
物理
工程类
图层(电子)
作者
Valeri Ivanov Petkov,Leonardo Pelcastre,Carlos Solano,Patrik Fernberg
出处
期刊:Materials
[MDPI AG]
日期:2022-12-24
卷期号:16 (1): 169-169
摘要
Two 4,4'-(hexafluoroisopropylidene)diphthalic anhydride-based thermosetting polyimide formulations with varied amounts of crosslinking sites were compared to understand the influence of crosslinking density on fracture toughness, glass transition temperature and thermal oxidative stability. The thermal and mechanical properties of both materials were investigated through a series of single-edge notched beams, differential scanning calorimetry, dilatometry, weight loss, light optical microscopy and nanoindentation experiments. It was found out that the reduced crosslinking resulted in slightly increased fracture toughness but decreased the Tg of the material. No significant difference could be observed in the thermal oxidative stability with the experimental techniques considered.
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