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首页> 外文期刊>Journal of Polymers and the Environment >Investigation of Photodegradation Preventing of Polyvinyl Alcohol/Nanoclay Composites
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Investigation of Photodegradation Preventing of Polyvinyl Alcohol/Nanoclay Composites

机译：光降解防止聚乙烯醇/纳米粘土复合材料的研究

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摘要

The effects of UV irradiation on chemical, thermal, mechanical, and morphological properties of polyvinyl alcohol (PVOH)/2 wt.% of nanoclay(NC) filler were investigated. PVOH composite films were prepared from PVOH blend with fixed content (2%) of NC via the solution casting method.Pure PVOH and PVOH composites were exposed to 340nm fluorescent UV lamps and assessed for 50h, 100h, and 200h UV exposue. The experimental results such as Fourier transform infrared (FTIR) confirmed that 2% wt. NC filler is efficient and can resist chemical degradation that is caused by ultraviolet irradiation (UV). The carbonyl and hydroxyl indices were increased with increasing the UV exposure irradiation times of both PVOH and PVOH composite. However, the PVOH nanocomposites exhibited more resistant to increasing the indices after exposure to UV irradiation with a longer exposure time. The thermal results (TGA) indicated that PVOH nanocomposite is exhibited more resistance to thermal degradation after UV irradiation exposure compared to that of pure PVOH sample. From DMA results, the storage of modulus was reduced after exposure to UV irradiation of PVOH and PVOH nanocomposites. The results of T-g of PVOH nanocomposites increased after the incorporation of 2% wt. NC into PVOH after exposure to UV irradiation. PVOH nanocomposite exhibited more resistance to reduce the tensile strength after exposure to 200h UV irradiation. XRD tests showed that PVOH/2 wt.% NC nanocomposites have more resistant to increase intensity after exposure to 200h UV irradiation compared to that of PVOH sample. The morphology micrographs showed that no obvious cracks on the PVOH nanocomposite after UV irradiation exposure by comparing to that of pure PVOH.
机译：UV辐射对聚乙烯醇（PVOH）/ 2重量％的化学，热，机械和形态学性质的影响。研究了纳米粘土（NC）填料的％。通过溶液浇铸方法用固定含量（2％）的PVOH混合物制备PVOH复合膜。将PVOH和PVOH复合材料暴露于340nm荧光UV灯并评估50h，100h和200h uV阐明。傅里叶变换红外（FTIR）的实验结果证实了2％wt。 NC填料是有效的，可以抵抗由紫外线照射（UV）引起的化学降解。随着PVOH和PVOH复合物的UV暴露辐射时间增加，羰基和羟基索引增加。然而，PVOH纳米复合材料表现出更耐抗性在暴露于UV照射后增加索引，较长的曝光时间。热结果（TGA）表明，与纯PVOH样品相比，PVOH纳米复合材料表现出紫外线照射暴露后的热降解的耐热性。从DMA结果中，在暴露于PVOH和PVOH纳米复合材料的UV照射后，减少模量的储存。在掺入2％wt后，PVOH纳米复合材料的T-G的结果增加。暴露于紫外线照射后NC进入PVOH。 PVOH纳米复合材料在暴露于200HV辐照后，更加耐受降低拉伸强度。 XRD试验显示PVOH / 2重量％。与PVOH样品相比，在暴露于200h紫外线辐射后，％NC纳米复合材料具有更高的抗强度。通过比较纯PVOH，形态学显微照片显示在紫外线照射暴露后PVOH纳米复合材料的明显裂缝。

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