Li Yuepeng, Li Degang, Han Wenyuan, Zhang Manqi, Ai Bing, Zhang Lipeng, Sun Hongqi, Cui Zhen
School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, China.
School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia.
Polymers (Basel). 2019 May 6;11(5):813. doi: 10.3390/polym11050813.
A new di-mannitol adipate ester-based zinc metal alkoxide (DMAE-Zn) was synthesized as a bi-functional poly(vinyl chloride) (PVC) thermal stabilizer for the first time. The materials were characterized with Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Characterization results confirmed the formation of Zn-O bonds in DMAE-Zn, and confirmed that DMAE-Zn had a high decomposition temperature and a low melting point. The thermal stability of DMAE-Zn on PVC also was tested by a conductivity test, a thermal aging test, and a UV-visible spectroscopy (UV-VIS) test. PVC stabilized by DMAE-Zn had a good initial color and excellent long-term stability. UV-VIS also showed that the conjugated structure in PVC stabilized by DMAE-Zn was almost all of the triene, suggesting that the addition of DMAE-Zn would suppress the formation of conjugated structures above tetraene. The dynamic processing performance of PVC samples tested by torque rheometer indicated that, having a good compatibility with PVC chains in the amorphous regions, DMAE-Zn contributed a good plasticizing effect to PVC. DMAE-Zn thus effectively demonstrates bi-functional roles, e.g., thermal stabilizers and plasticizers to PVC. Furthermore, FT-IR, a HCl absorption capacity test, and a complex ZnCl test were also used to verify the thermal stability mechanism of DMAE-Zn for PVC.
首次合成了一种新型的基于己二酸二甘露醇酯的锌金属醇盐（DMAE-Zn）作为双功能聚氯乙烯（PVC）热稳定剂。采用傅里叶变换红外光谱（FT-IR）和热重分析（TGA）对材料进行了表征。表征结果证实了DMAE-Zn中Zn-O键的形成，并证实DMAE-Zn具有高分解温度和低熔点。还通过电导率测试、热老化测试和紫外可见光谱（UV-VIS）测试对DMAE-Zn对PVC的热稳定性进行了测试。由DMAE-Zn稳定的PVC具有良好的初始颜色和优异的长期稳定性。UV-VIS还表明，由DMAE-Zn稳定的PVC中的共轭结构几乎全是三烯，这表明添加DMAE-Zn会抑制四烯以上共轭结构的形成。用转矩流变仪测试的PVC样品的动态加工性能表明，DMAE-Zn与非晶区的PVC链具有良好的相容性，对PVC具有良好的增塑效果。因此，DMAE-Zn有效地发挥了双功能作用，例如作为PVC的热稳定剂和增塑剂。此外，还利用FT-IR、HCl吸收容量测试和络合ZnCl测试来验证DMAE-Zn对PVC的热稳定机理。
