尿嘧啶
热稳定性
稳定器(航空)
氯乙烯
质子核磁共振
化学
高分子化学
核化学
氯
傅里叶变换红外光谱
热重分析
材料科学
有机化学
化学工程
聚合物
工程类
机械工程
DNA
生物化学
共聚物
作者
Xiaopeng Xu,Si Chen,Wei Tang,Yingjun Qu,Xu Wang
标识
DOI:10.1016/j.polymdegradstab.2012.11.008
摘要
Novel uracil thermal stabilizers for rigid poly(vinyl chloride) (PVC), N, N-dimethyl-6-amino-uracil (DAU), N-monomethyl-6-amino-uracil (MAU) and N-monomethyl-6-amino-thiouracil (MATU) were synthesized successfully via a precipitation method, and characterized with 1H NMR spectra. Evaluation of these compounds as thermal stabilizer for rigid PVC was measured by discoloration test, and also using Haake torque rheometer and TGA. The results showed that, these novel uracil derivatives exhibited greater stabilizing efficiency compared with traditional Ca/Zn stabilizers (CZ) and diphenylthiourea (DTU) with the same concentration in PVC mixtures. This is attributed to the ability of these compounds to replace the labile chlorine atoms in PVC chains, and absorb of HCl released by the degradation of PVC, which was proved by the FTIR and 1H NMR spectral analysis. Furthermore, an excellent synergistic effect could be obtained when the model compound MATU combined with zinc stearate (ZnSt2) in different mass ratios, and the initial color and long-term stability of PVC products were remarkably improved.
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