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作 者 ：丁文博, 哈益明, 李彦杰, 包亚莉, 李咏富

期 刊 ：核农学报 2016年 30卷 4期 页码：695-703

关键词：黄原胶；60Co-γ辐射接枝；N-乙烯基吡咯烷酮(NVP)；黏性性能；

Keywords:xanthan gum, 60Co-γ, radiation graft, NVP, viscosity properties,

摘 要 ：为提高黄原胶分子的应用性能,以⁶⁰Co-γ为辐射源,对黄原胶和N-乙烯基吡咯烷酮进行共辐射接枝处理,制备黄原胶-N-乙烯基吡咯烷酮共聚物(XG-g-NVP),并研究反应条件对接枝率和单体利用率的影响及共聚物的结构表征。结果表明,当辐射吸收剂量为10kGy,黄原胶浓度12g·L^-1, NVP/XG质量比8:1,4-甲氧基酚阻聚剂添加量为NVP单体质量的0.01%时,最佳接枝率为543.3%,单体利用率为67.9%。红外光谱表明接枝反应发生在NVP乙烯基部位,扫描电镜图显示共聚物形貌由片层状逐步过渡到颗粒状; XG-g-NVP的抗高温及抗剪切能力相比黄原胶有所提高,且黏度值在高温、高剪切力时仍保持恒定值,因此,改性后的黄原胶结构及热稳定性提高。通过对黄原胶分子接枝改性,使其具备了更多优良的性能,为改性黄原胶的进一步应用奠定了理论基础。

Abstract:To improve the application performance of xanthan gum, xanthan gum-g-N-vinylpyrrolidone graft copolymer (XG-g-NVP) was prepared by⁶⁰Coγ-irradiation, then to study the structural characterization of copolymers and the effects of synthesis conditions on grafting ratio and monomer utilization. The results showed that the best grafting ratio was up to 543.3% and the monomer utilization reached 67.9% when radiation absorbed dose is 10 kGy, the concentration of xanthan gum is 12g·L^-1, the mass ratio of NVP/XG was 8:1, and the mass of 4-methoxyphenol polymerization inhibitor is 0.01% of the amount of NVP. IR figure showed that the grafting reaction occurred in NVP vinyl part and SEM showed that the structure of copolymer became grain-like from flake-like. The molecular structure and morphology were analyzed and confirmed by IR and ESM. Compared to the xanthan gum, the high temperature resistance and shear resistance of XG-g-NVP were improved, and the viscosity remains constant at high temperature and high shear force. Therefore, the structure and thermal stability of xanthan gum were improved after modification. The xanthan molecular had more excellent performance through the study of grafting modification, and laid the theoretical basis for further application of modification xanthan gum.

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