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Degradation of PVC waste into a flexible polymer by chemical modification using DINP moieties

机译：用DINP部分通过化学改性将PVC废物降解到柔性聚合物中

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In consideration of the toxicity and high migration capacity of plasticizers, the possibility to obtain flexible PVC via chemical modification of PVC was investigated for feedstock recycling. In this work, some Cl atoms of PVC were substituted with fragments of the common plasticizer DINP (diisononyl phthalate) in the presence of K _(2) CO _(3) (potassium carbonate) or DIEA ( N , N -diisopropylethylamine), and the simultaneous elimination of PVC was suppressed. ~(1) H NMR ( ~(1) H nuclear magnetic resonance spectroscopy) and ~(1) H– ~(1) H COSY ( ~(1) H– ~(1) H correlation spectroscopy) were used to evaluate the substitution while a novel method of calculating the substitution and elimination ratios was developed using a combination of ~(1) H NMR and elemental analysis. A maximum substitution rate of 35.7% was achieved using thiophenol as a nucleophile in the presence of DIEA, while the corresponding elimination of HCl was just 4.4%. In addition, the thermal stability of the modified PVCs was very close to that of pure PVC, which suggested that the main characteristics of PVC were preserved. Moreover, the T _(g) values of all the modified PVCs were less than that of PVC, which means it is feasible to improve the plasticity of PVC via substituting some Cl on PVC with DINP moieties. Therefore, an alternative approach for feedstock recycling of PVC by chemical modification was developed in this work.
机译：考虑到增塑剂的毒性和高迁移能力，研究了通过PVC的化学改性获得柔性PVC的可能性进行原料再循环。在这项工作中，在K _（2）CO _（3）（碳酸钾）或DIEA（N，N-二异丙基乙胺）存在下，将PVC的一些CL原子用普通增塑剂DINP（邻苯二甲酸二硅烷酯）的片段取代并且抑制了PVC的同时消除。 〜（1）H NMR（〜（1）H核磁共振光谱）和〜（1）H-〜（1）H舒适（〜（1）H-〜（1）H相关光谱）用于评估使用〜（1）H NMR和元素分析的组合，开发了一种计算取代和消除比的新方法。在DIEA存在下，使用硫代酚作为亲核官量实现了35.7％的最大替换率，而相应的HCl的消除仅为4.4％。另外，改性PVC的热稳定性非常接近纯PVC的热稳定性，这表明保留了PVC的主要特征。此外，所有修饰的PVC的T _（g）值小于PVC的T _（g）值，这意味着通过用DINP部分取代一些CL在PVC上改善PVC的可塑性是可行的。因此，在这项工作中开发了通过化学改性进行PVC的原料回收的替代方法。

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