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首页> 外文期刊>Journal of Applied Polymer Science >The effect of UV-irradiation and molten medium on the mechanical and thermal properties of polystyrene-polycarbonate blends
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The effect of UV-irradiation and molten medium on the mechanical and thermal properties of polystyrene-polycarbonate blends

机译：紫外线和熔融介质对聚苯乙烯-聚碳酸酯共混物机械和热性能的影响

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摘要

Polymer materials with improved properties can be obtained through polymer blends. As a polymer mixture is generally immiscible and incompatible, it is necessary to develop new methods to improve the interfacial adhesion. The aim of this work is to find formulations and associated processes to upgrade engineering polystyrene (PS) and polycarbonate (PC) polymer blends with the objective of using the best "process-formulation" couple. In this study, blends of PS/PC were prepared in molten medium using reactive extrusion after UV-irradiation. The effects of UV-irradiation on some properties of blends under molten medium were investigated by differential scanning calorimetry (DSC), fourier transform infrared (FTIR), and thermogravimetric analysis (TGA). The data showed that the presence of polycarbonate in the blend increased the tensile strength and elongation at break with respect to pure PS. The mechanical properties of the blends were improved after irradiation. All irradiated blends are thermally more stable than those nonirradiated. Chemical changes can be clearly seen in FTIR spectra through two bands assigned to C=O and OH groups. The mutual influence between the PS/PC polymer blends compositions during UV-irradiation was studied. PS and PC have different photo-mechanisms due to the larger UV absorption of polystyrene and formation of more stable tertiary carbon radicals.
机译：可以通过聚合物共混物获得具有改进性能的聚合物材料。由于聚合物混合物通常是不溶混和不相容的，因此有必要开发新的方法来改善界面粘合力。这项工作的目的是找到配方和相关工艺，以升级工程聚苯乙烯（PS）和聚碳酸酯（PC）聚合物共混物，以使用最佳的“工艺配方”对。在这项研究中，在紫外线照射后，通过反应挤出在熔融介质中制备PS / PC的混合物。通过差示扫描量热法（DSC），傅立叶变换红外光谱（FTIR）和热重分析（TGA）研究了紫外线辐射对熔融介质下共混物某些性能的影响。数据表明，共混物中聚碳酸酯的存在增加了相对于纯PS的拉伸强度和断裂伸长率。辐照后共混物的机械性能得到改善。所有辐照的混合物比未辐照的混合物更热稳定。通过指定为C = O和OH基团的两个波段，可以在FTIR光谱中清楚地看到化学变化。研究了PS / PC聚合物共混物组合物在紫外线照射期间的相互影响。 PS和PC具有不同的光机理，这是由于聚苯乙烯具有更大的UV吸收能力和更稳定的叔碳自由基的形成。

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