用红外光谱和量热法研究聚乙烯氧化物薄膜的变形、网状和老化

C. Bergeron, Etienne Perrier, A. Potier, G. Delmas
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引用次数: 27

摘要

聚乙烯氧化物(PEO)的量热和红外(IR)光谱测量用于评估薄膜在温度循环(30°C - 90°C - 30°C)中经历的变形和松弛。熔化后,部分条带强度降低10% ~ 70%。在温度循环过程中,1100 cm−1区域的C-O波段以及650和500 cm−1区域的C-C-O变形带呈现出一些新的特征。在具有特殊历史的薄膜中,即在热处理薄膜中,在凝胶形成溶液制备的薄膜中,以及在老化后的厚膜中,PEO链之间形成氧-氢协同相互作用的网络。从1200和900 cm−1区域的红外吸收波段以及1144和956 cm−1的小波段可以推测出链间相互作用网络。这种网络在薄膜中似乎不存在或减少了。红外光谱是研究PEO薄膜和其他有序、无序和分子间相互作用共存的材料中的链构象的一种敏感技术。
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A Study of the Deformation, Network, and Aging of Polyethylene Oxide Films by Infrared Spectroscopy and Calorimetric Measurements
The calorimetric and infrared (IR) spectroscopy measurements of polyethylene oxide (PEO) are used to evaluate the deformation and relaxation that films experience during a temperature cycle (30°C–90°C–30°C). After melting, the intensity of some bands decreases by 10 to 70%. During the temperature cycle, the C–O band in the 1100 cm−1 region and the C–C–O deformation bands at 650 and 500 cm−1 show some new features. A network of cooperative oxygen-hydrogen interactions between the PEO chains form in films with special history, namely, in thermally treated films, in thin films prepared from gel forming solutions, and in thick films after aging. The interchain interaction network is suggested from the IR absorption bands in the 1200 and 900 cm−1 region and also from small bands at 1144 and 956 cm−1. The network seems absent or reduced in thin films. IR spectroscopy appears a sensitive technique to study chain conformations in PEO films and in other materials where order, disorder, and the formation of intermolecular interactions coexist.
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