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摘要
以聚乙二醇(PEG)和改性二苯基甲烷二异氰酸酯为主要原料,利用化学发泡法制备了不同异氰酸酯指数(R值)的PEG基聚氨酯泡沫(P-PUF)。通过红外光谱、光学显微镜、热失重、吸水率和力学性能测试研究了R值对P-PUF结构与性能的影响。结果表明,随着R值的增加,P-PUF的热稳定性、吸水率和拉伸强度均先增加后减小,泡孔直径整体呈增大趋势;R=0.8时,P-PUF的吸水率为1666%,干燥状态拉伸强度为607kPa,起始分解温度为382.34℃,综合性能最佳。
Abstract
Polyethylene glycol-based polyurethane foams (P-PUF) with different isocyanate indexes (R value) were prepared,based on the main materials of polyethylene glycol (Mn=2000) and modified diphenylmethane diisocyanate,by chemical foaming method.The effect of R value on the structure and performance of P-PUF was studied through FT-IR,optical microscope,TG,and water absorptionand mechanical property testing.The results shown that with the increase of R value,the cell diameter of P-PUF tended to increase.And the thermal stability,water absorption and tensile strength all increased first and then decreased.When R was 0.8,the P-PUF shown the best overall performance,the water absorption reached 1666%,the tensile strength 607kPa and the onset decomposition temperature 382.34℃.
关键词
聚乙二醇
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聚氨酯泡沫
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异氰酸酯指数
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吸水率
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力学性能
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热稳定性
Key words
PEG
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polyurethane foam
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R value
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water absorption
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mechanical property
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thermal stability
异氰酸酯指数对聚乙二醇基聚氨酯泡沫性能的影响[J].
化工新型材料, 2022, 50(3): 185-188 DOI:10.19817/j.cnki.issn1006-3536.2022.03.037
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