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首页> 外文期刊>Applied Surface Science >Surface characteristics of UV-irradiated polyurethane elastomers extended with α, ω-alkane diols
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Surface characteristics of UV-irradiated polyurethane elastomers extended with α, ω-alkane diols

机译：用α，ω-链烷二醇扩展的紫外线辐射聚氨酯弹性体的表面特性

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摘要

Polyurethane elastomers (PUEs) based on 4,4'-diphenylmethane diisocyanate (MDI), poly (ε-caprolactone) (PCL) and extended with series of chain extender (CE) were synthesized via two step polymerization technique. The synthesized samples were irradiated for 50, 100 and 200 h in an UV exposure unit as such the spectral distribution of the light is good match for terrestrial solar radiation. The modifications in the chemical structures of the PU before and after irradiation were characterized using Fourier transform infrared (FT-IR) technique. The effect of irradiation time and chain extenders length on surface properties were studied and investigated. Photo-oxidation of PU surface leads to fast increase in surface free energy and its polar component. Simultaneously, the work of water adhesion to polymer increases significantly during UV-irradiation. The higher changes in surface properties, observed by water absorption (%), equilibrium degree of swelling, as well as monitored by ATR-FT-IR and contact angle measurement, were found for the PU samples extended with higher number of methylene unit and irradiation time.
机译：通过两步聚合技术合成了基于4,4'-二苯基甲烷二异氰酸酯（MDI），聚（ε-己内酯）（PCL）并经一系列扩链剂（CE）扩展的聚氨酯弹性体（PUE）。合成的样品在紫外线曝光单元中照射了50、100和200小时，因为这样的光的光谱分布与地面太阳辐射非常匹配。使用傅里叶变换红外（FT-IR）技术表征了辐照前后PU的化学结构。研究并研究了辐照时间和扩链剂长度对表面性能的影响。 PU表面的光氧化会导致表面自由能及其极性成分快速增加。同时，在紫外线照射下，水与聚合物的粘附作用显着增加。对于具有较高亚甲基单元数和辐照量的聚氨酯样品，通过吸水率（％），溶胀平衡度以及通过ATR-FT-IR和接触角测量监测到的表面性质的变化较高时间。

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