| 脂肪族聚氨酯热稳定性的研究 |
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| 引用本文： | 余守志,朱琰,任志勇,常林开,杨惠昌. 脂肪族聚氨酯热稳定性的研究[J]. 河南科学, 1989, 0(Z2) |
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| 作者姓名： | 余守志 朱琰 任志勇 常林开 杨惠昌 |
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| 作者单位： | 河南省科学院化学研究所，河南省科学院化学研究所，河南省科学院化学研究所，河南省科学院化学研究所，河南省科学院化学研究所 |
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| 摘 要： | 利用热重分析及热重动力学方法研究了作者新合成的一系列新型聚酯型脂肪族聚氨酯的热稳定性.首次报导了它们的热重及热降解反应动力学特征参数,并讨论了硬段含量、合成方法及降解气氛等因素对脂肪族聚氨酯热降解反应的影响.实验结果表明:脂肪族聚氨酯的热降解反应呈多阶段性,硬段含量对其热降解反应的第一阶段有较大的影响.当硬段含量为30～40%时,热稳定性相对较强,其热降解反应表观活化能约为1160kJ/mol,热降解温度约为300℃.用一步法合成的脂肪族聚氯酯的热稳定性略优于用二步法合成的样品.与芳香族聚氨酯相比,脂肪族聚氨酯在受热时易受氧的进攻,因此采取相应的抗氧措施是提高脂肪族聚氨脂热稳定性的有效途径.
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| 关 键 词： | 脂肪族聚氨酯 热稳定性 热重动力学 |
HERMOSTABILITY STUDIES OF ALIPHATIC POLYURETHANES |
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| Yu Shouzhi,Zhu Yan,Ren Zhiyong,Chang Linkai and Yang Hui chang,Henan Institute of Chemistry.Zhengzhou. HERMOSTABILITY STUDIES OF ALIPHATIC POLYURETHANES[J]. Henan Science, 1989, 0(Z2) |
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| Authors: | Yu Shouzhi Zhu Yan Ren Zhiyong Chang Linkai Yang Hui chang Henan Institute of Chemistry.Zhengzhou |
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| Abstract: | The thermostability of a new series of aliphatic polyurethanes (ASPU)has been studied by TG and thermogravimetric kinetics.The results shown that the decomposition may be divided into tow stages.The content of the hard block has influence on the first stage of the.decomposition.When the hard block content was 30-40%.the thermostability was the strongest.It was found thatt the ASPU composed by one stage method vas stabler than the ASPU composeb by tow stages method.And oxygen has influence on the decomposition of ASPU greatly,therefore,it is efficacious on heightening the thermostability to take oxidationresistant neasures. |
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| Keywords: | aliphatic polyurethanes thermostability therinogravimetric kinetics. |
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