Synthesis and application of uracil derivatives as novel thermal stabilizers for rigid poly(vinyl chloride)
Synthesis and application of uracil derivatives as novel thermal stabilizers for rigid poly(vinyl chloride)
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新型硬质聚氯乙烯热稳定剂尿嘧啶衍生物的合成及应用
DOI：
10.1016/j.polymdegradstab.2012.11.008
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发表时间：
2013-02-01
影响因子：
5.9
通讯作者：
Wang, Xu
中科院分区：
文献类型：
--
作者：
Xu, Xiaopeng;Chen, Si;Wang, Xu
采用沉淀法成功合成了新型硬质聚氯乙烯（PVC）、N,N-二甲基-6-氨基尿嘧啶（DAU）、N-单甲基-6-氨基尿嘧啶（MAU）和N-单甲基-6-氨基硫尿嘧啶（MATU）热稳定剂，并用H-1 NMR谱进行了表征。这些化合物作为硬质 PVC 热稳定剂的评价通过变色试验以及使用 Haake 扭矩流变仪和 TGA 进行测量。结果表明，与相同浓度的传统钙/锌稳定剂（CZ）和二苯基硫脲（DTU）相比，这些新型尿嘧啶衍生物在PVC混合物中表现出更高的稳定效率。这归因于这些化合物能够取代PVC链中不稳定的氯原子，并吸收PVC降解释放的HCl，这一点已被FTIR和1H NMR光谱分析所证明。此外，模型化合物MATU与硬脂酸锌(ZnSt(2))以不同质量比组合可产生优异的协同效应，显着改善PVC制品的初始色泽和长期稳定性。 (C) 2012 Elsevier Ltd. 保留所有权利。
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 H-1 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 (ZnSt(2)) in different mass ratios, and the initial color and long-term stability of PVC products were remarkably improved. (C) 2012 Elsevier Ltd. All rights reserved.