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首页> 外文期刊>Journal of Applied Polymer Science >Effects of Wide-Range γ-Irradiation Doses on the Structures and Properties of 4,40-Dicyclohexyl Methane Diisocyanate Based Poly(carbonate urethane)s
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Effects of Wide-Range γ-Irradiation Doses on the Structures and Properties of 4,40-Dicyclohexyl Methane Diisocyanate Based Poly(carbonate urethane)s

机译：大范围γ射线辐照剂量对4,40-二环己基甲烷二异氰酸酯基聚碳酸亚乙酯的结构和性能的影响

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摘要

For medical applications, 4,4′-dicyclohexyl methane diisocyanate (HMDI)-based poly(carbonate urethane)s were synthesized from HMDI and 1,4-butanediol as hard segments and poly(carbonate diol) (number-average molecular weigh=52000 g/mol) as soft segments. The effects of wide-range γ irradiation on the samples were examined through a series of analytical techniques. Scanning electron microscopy revealed that γ irradiation etched and roughened the surfaces of the irradiated samples. The gel content and crosslinking density measurements confirmed that crosslinking occurred along with degradation at all of the investigated irradiation doses and the degree of both crosslinking and degradation increased with increasing irradiation dose. Fourier transform infrared spectroscopy demonstrated that chain scission in the γ-irradiated samples occurred at the carbonate and urethane bonds. The decreasing molecular weight and tensile strength indicated that the degradation increased with the γ-irradiation dose. Differential scanning calorimetry and dynamic mechanical thermal analysis indicated that γ irradiation had no significant effect on the phase-separation structures. There was a slight reduction in the contact angle. An evaluation of the cytotoxicity demonstrated the nontoxicity of the nonirradiated and irradiated polyurethanes.
机译：对于医学应用，由HMDI和1,4-丁二醇作为硬链段和聚碳酸乙二醇酯（数均分子量= 52000）合成了4,4'-二环己基甲烷二异氰酸酯（HMDI）基的聚碳酸氨基甲酸酯g / mol）作为软链段。通过一系列分析技术检查了大范围γ辐射对样品的影响。扫描电子显微镜显示，γ辐射腐蚀和粗糙化了辐射样品的表面。凝胶含量和交联密度的测量结果证实，在所有研究的辐照剂量下，交联均与降解一起发生，并且交联和降解的程度均随辐照剂量的增加而增加。傅里叶变换红外光谱表明，γ辐照样品中的断链发生在碳酸酯和氨基甲酸酯键处。分子量和抗张强度的降低表明降解随着γ辐照剂量的增加而增加。差示扫描量热法和动态机械热分析表明，γ辐照对相分离结构没有显着影响。接触角略有减小。细胞毒性的评估证明了未辐照和辐照聚氨酯的无毒。

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