發(fā)布時間：2018-08-12 14:02

【摘要】：本文以端氨基聚二甲基硅氧烷(PDMS)為硅源,嵌段改性聚醚型聚氨酯。并采用旋涂法制備有機(jī)硅改性聚氨酯薄膜。利用自主設(shè)計的多環(huán)境因素老化實(shí)驗(yàn)箱對薄膜進(jìn)行紫外環(huán)境暴露、臭氧環(huán)境暴露、紫外和臭氧雙因素環(huán)境暴露老化實(shí)驗(yàn)。通過測試有機(jī)硅改性聚氨酯薄膜伴隨老化時間延續(xù)的紅外光譜和紫外可見光譜,研究了其色差和黃色指數(shù)的改變規(guī)律,分析了有機(jī)硅改性聚氨酯薄膜樣品的耐老化性能,以及有機(jī)硅含量對聚氨酯薄膜耐老化性能的影響,分析了紫外和臭氧雙因素環(huán)境對純聚氨酯薄膜和有機(jī)硅改性聚氨酯薄膜的老化作用。在紫外環(huán)境暴露實(shí)驗(yàn)中,有機(jī)硅可以有效抑制聚氨酯薄膜的黃變。并且伴隨有機(jī)硅含量的逐漸增加,改性聚氨酯薄膜的耐黃變性能逐漸提升;隨著暴露時間的延長,聚氨酯薄膜在190-400nm的紫外吸光度逐漸增加;有機(jī)硅可以有效抑制聚氨酯薄膜的光氧化降解,并且伴隨有機(jī)硅含量逐漸增大,改性聚氨酯薄膜光氧化降解速率逐漸變慢。在臭氧環(huán)境暴露實(shí)驗(yàn)中,有機(jī)硅可以有效抑制聚氨酯薄膜的黃變。并且伴隨有機(jī)硅含量的逐漸增加,聚氨酯薄膜的耐黃變性能逐漸提升;有機(jī)硅的加入可以有效地抑制聚氨酯薄膜的光氧化降解;伴隨有機(jī)硅含量逐漸增大,聚氨酯薄膜光氧化降解速率逐漸變慢。在短時間暴露實(shí)驗(yàn)過程中,有機(jī)硅含量對改性后的聚氨酯薄膜的抗光氧化老化能力影響不大,在長時間暴露實(shí)驗(yàn)過程中,有機(jī)硅含量越高,改性后的聚氨酯薄膜的抗光氧化老化能力越強(qiáng)。在紫外和臭氧雙因素環(huán)境暴露實(shí)驗(yàn)中,有機(jī)硅可以有效抑制聚氨酯薄膜的黃變。并且伴隨有機(jī)硅含量的逐漸增加,改性聚氨酯薄膜的耐黃變性能逐漸提升;隨著暴露時間的延長,各聚氨酯薄膜在190-400nm的紫外吸光度逐漸增加; NH和 C=O伸縮振動峰峰高逐漸增加,峰寬逐漸增大,峰面積逐漸增大;隨著有機(jī)硅含量增大,改性聚氨酯薄膜光氧化降解速率逐漸變慢。在紫外和臭氧雙因素環(huán)境暴露實(shí)驗(yàn)中,有機(jī)硅改性聚氨酯薄膜表現(xiàn)出良好的耐紫外/臭氧老化性能;紫外和臭氧對純聚氨酯薄膜存在明顯的協(xié)同老化效應(yīng)。
[Abstract]:In this paper, Polyether polyurethane was modified by block modification with amino terminated polydimethylsiloxane (PDMS) as silicon source. Silicone modified polyurethane films were prepared by spin coating method. The ultraviolet exposure, ozone exposure, ultraviolet and ozone two-factor environmental exposure tests were carried out by using the self-designed multi-environmental factors aging test box. The changes of color difference and yellow index of organosilicon modified polyurethane film were studied by means of infrared and ultraviolet visible spectra, and the aging resistance of organic silicon modified polyurethane film was analyzed. The effects of organosilicon content on the aging resistance of polyurethane films were analyzed. The aging effects of UV and ozone on pure polyurethane films and silicone modified polyurethane films were analyzed. In UV exposure experiments, silicone can effectively inhibit yellowing of polyurethane films. With the increase of organosilicon content, the yellowing resistance of the modified polyurethane film was improved, and the UV absorbance of the modified polyurethane film in 190-400nm increased with the prolongation of the exposure time. Organic silicon can effectively inhibit the photooxidative degradation of polyurethane films, and with the increase of organic silicon content, the photooxidation degradation rate of modified polyurethane films becomes slower. In ozone exposure experiments, silicone can effectively inhibit the yellowing of polyurethane films. With the increase of organic silicon content, the yellowing resistance of polyurethane film was gradually improved; the addition of organic silicon could effectively inhibit the photooxidation degradation of polyurethane film; with the increase of organic silicon content, The photooxidation degradation rate of polyurethane film is decreasing gradually. During the short exposure test, the content of organosilicon has little effect on the photooxidation resistance of the modified polyurethane film, and the higher the content of organosilicon is during the long time exposure, the higher the content of organic silicon is. The resistance to photooxidation of the modified polyurethane film is stronger than that of the modified polyurethane film. In UV and ozone exposure experiments, silicone can effectively inhibit the yellowing of polyurethane films. With the increase of organosilicon content, the yellowing resistance of the modified polyurethane films was gradually improved, and the yellowing resistance of the modified polyurethane films increased with the increase of exposure time. The UV absorbance of polyurethane films increased gradually in 190-400nm, the peak height and width of the peaks increased, the peak area increased with the increase of organosilicon content, and the peak height and the peak width increased gradually with the increase of organosilicon content. The photooxidation degradation rate of modified polyurethane film was gradually slowed down. In both UV and ozone exposure experiments, silicone modified polyurethane films exhibit good UV / ozone aging resistance, and UV and ozone have obvious synergistic aging effects on pure polyurethane films.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：O633.14;TB383.2

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