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首页> 外文期刊>Journal of Applied Polymer Science >Strucutre-Property Behavior of Gamma-Irradiated Poly (styrene) and Poly (methyl methacrylate) Miscible Blends
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Strucutre-Property Behavior of Gamma-Irradiated Poly (styrene) and Poly (methyl methacrylate) Miscible Blends

机译：γ射线辐照的聚苯乙烯和聚甲基丙烯酸甲酯混溶共混物的结构性能行为

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摘要

Polymer blends based on various ratios of polystyrene (PS) and polymethyl methacrylate (PMMA) were exposed to different doses of gamma radiation up to 25 Mrad. The structure-property behavior of the polymer blends beofre and after they had been irradiated was investigated by DSC, TGA, and FTIR spectroscopy. The DSC scans of the glass transition temperature (T_g) of the different polymer blends showed that the T_g was greatly decreased by increasing the ratio of the PMMA component in the polymer blends. Moreover, the T_g of PS/PMMA blends was found to decrease with increasing irradiation does. The depression in T_g was noticeable in the case of blends rich in PMMA component. The TGA thermograms showed that the thermal stability of the unirradiated polymer blends decreases with increasing the ratios of PMMA component. Also, it was found that the presence of PS polymer in the blends affords protection against gamma radiation degradation and improves their thermal stability. However, exposing the polymer blends to high doses of gamma radiation caused oxidative degradation to PMMA components and decreased the thermal stability. The investigation of the kinetic parameters of the thermal decomposition reaction confirm the results of thermal stability. The FTIR analysis of the gamma-irradiated polymer blend films gives further support to the TGA data.
机译：将基于各种比例的聚苯乙烯（PS）和聚甲基丙烯酸甲酯（PMMA）的聚合物共混物暴露于不同剂量的高达25 Mrad的伽马射线。通过DSC，TGA和FTIR光谱研究了聚合物共混物在辐照后和在辐照后的结构性能。不同聚合物共混物的玻璃化转变温度（T_g）的DSC扫描显示，通过增加聚合物共混物中PMMA组分的比例，T_g大大降低。此外，发现PS / PMMA共混物的T_g随着辐照剂量的增加而降低。在富含PMMA组分的共混物的情况下，T_g的降低是明显的。 TGA热分析图表明，未辐射的聚合物共混物的热稳定性随PMMA组分比例的增加而降低。另外，发现共混物中PS聚合物的存在提供了针对γ辐射降解的保护并改善了它们的热稳定性。然而，将聚合物共混物暴露于高剂量的伽马辐射下会导致PMMA组分的氧化降解并降低热稳定性。对热分解反应的动力学参数的研究证实了热稳定性的结果。 γ射线辐照的聚合物共混物薄膜的FTIR分析为TGA数据提供了进一步的支持。

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