学术
聚氯乙烯辐射效应的NMR研究
闫秀玲[2] 赵新[1,3] 唐军[1] 孙万赋[1]
[1]新疆大学理化测试中心,新疆乌鲁木齐830046 [2]新疆伊犁师范学院化学与生物科学学院,新疆伊犁835002 [3]波谱与原子分子物理国家重点实验室（中国科学院武汉物理与数学研究所）,湖北武汉430071
摘 要:
用^1H和^13C NMR谱，FT-IR光谱等方法研究了聚氯乙烯（PVC）在限量空气氛室温下经^60Co γ射线辐照后的辐照效应．结果表明PVC大分子链的脱HCI方式，受辐射剂量的影响．当辐射剂量达到2．8×10^5 Gy时，PVC以大分子链内脱HCl为主，产生部分-CH-CH=结构，使得-CHCl的运动受阻，表现为T2减小．不同溶剂对聚合物质子自旋-自旋弛豫时间（T2）的影响，反映出溶剂效应和聚合物链在溶剂中的“伸展”状态．而水质子峰随着辐照剂量的增大而逐渐向低场位移，则是由于HCl与溶剂中的H2O在微酸性溶液中发生了快速的质子交换之故．[著者文摘]
文章出处:
《波谱学杂志》-2008年25卷1期 -87-93页
分 类 号:
文献标识码:
A
文章编号:
1000-4556（2008）01-0087-07
The Effects of Irradiation on Polyvinyl Chloride Studied by NMR
YAN Xiu-ling , ZHAO Xin, TANG jun , SUN Wan-fu （1. The Center of Analysis and Measurement, Xinjiang University, Urumqi 830046, China; 2. Normal College of Yili, Yili 835000, China; 3. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics （Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences）, Wuhan 430071, China）
Abstract:
The effects of ^60Co irradiation on polyvinyl chloride（PVC） resin were studied by ^1H and ^13C NMR spectroscopy, proton spin-spin relaxation time （T2） measurement and FT-IR spectroscopy. The results indicated ^60Co irradiation induces degradation in PVC resin. T2 of the protons in -CH2 was found to increase with the irradiation dose, and this can be attributed to the fact that T2 of -CH2 protons is mainly determined by low frequency and long range motion of the chain, and is insensitive to short range segmental motion in the polymer structure. The results of ^13C NMR measurements showed that ^60Co rays irradiation causes oxidization of the polymer, as indicated by the appearance of carbonyl signals.[著者文摘]
Key words:
NMR, PVC, FT-IR, spin-spin relaxation time
基金资助:
波谱与原子分子物理国家重点实验室基金资助课题（T012406）.
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