乙烯基酯
材料科学
复合材料
降级(电信)
热重分析
聚酯纤维
不饱和聚酯
聚酯树脂
水解
丙酮
聚合物
溶剂
有机化学
单体
化学
电信
计算机科学
作者
Przemysław Pączkowski,Andrzej Puszka,Barbara Gawdzik
出处
期刊:Materials
[MDPI AG]
日期:2022-02-09
卷期号:15 (4): 1286-1286
被引量:24
摘要
This study compares the degradation process of unsaturated polyester resin (UPR) and vinyl ester resin (VER) and their biocomposites with kraft lignin. In order to study their degradation, accelerated aging, immersion in different solvents, microwave radiation and high temperature were applied. The results show that, depending on the conditions, the degradation assumes a different course. The VER resin is more chemically resistant than the UPR resin. In the case of the composites immersed in an aggressive solvent (acetone), it can be observed that the polymer matrix is degraded, whereas in water only a small increase of weight takes place. Immersion in NaOH initiates the degradation process consisting in the hydrolysis of ester bonds, which are especially observed for pure resins. Under the influence of UV radiation and microwaves, the resins are additionally cross-linked. Thermogravimetric analysis shows that in the case of composites heated to 1000 °C, a residual mass remains, which is carbonized with lignin. In turn, composites treated with microwaves lost weight.
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