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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：聚乙烯醇/纳米粘土复合材料的光降解防护研究

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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：研究了紫外线辐射对聚乙烯醇（PVOH）/ 2重量％纳米粘土（NC）填料的化学，热，机械和形态性能的影响。通过溶液浇铸法由NC含量固定为2％的PVOH共混物制备PVOH复合膜，然后将纯PVOH和PVOH复合物暴露于340nm荧光紫外灯下，并分别进行50h，100h和200h紫外线照射。诸如傅立叶红外光谱（FTIR）的实验结果证实了2％wt。 NC填料是有效的，并且可以抵抗由紫外线辐射（UV）引起的化学降解。随着PVOH和PVOH复合材料的紫外线照射时间增加，羰基和羟基指数增加。然而，PVOH纳米复合材料在暴露于具有更长的暴露时间的UV辐射之后表现出对增加指数的抵抗力。热结果（TGA）表明，与纯PVOH样品相比，PVOH纳米复合材料在紫外线照射后表现出更大的抗热降解性。根据DMA结果，在暴露于PVOH和PVOH纳米复合材料的紫外线照射后，模量的存储量降低了。掺入2％wt的PVOH纳米复合材料的T-g结果增加。暴露于紫外线照射后，NC变成PVOH。 PVOH纳米复合材料在暴露于200h UV辐射后表现出更大的抗降低拉伸强度的能力。 XRD测试表明，与PVOH样品相比，PVOH / 2 wt。％NC纳米复合材料在暴露于200h紫外线照射后具有更高的抗强度增加能力。形态显微照片显示，与纯PVOH相比，UVOH暴露后PVOH纳米复合材料上没有明显的裂纹。

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