Polymerization of Thermo-Responsive Poly(N-vinylcaprolactam): Effects of Temperature, Initiator and Monomer Concentration on Percent Conversion

Vietnam Journal of Catalysis and Adsorption Pub Date : 2024-03-09 DOI:10.62239/jca.2023.072

Hoang Thi Thuy, Cao Hong Ha, Phung Anh Tuan

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Abstract

Poly(N-vinyl caprolactam) (PNVCL) is a thermally responsive polymer. Its temperature-responsive properties make it an attractive candidate for various applications. A series of temperature-sensitive PNVCL were synthesized through free radical polymerization, using various of amount of Azobisisobutyronitrile (AIBN) as initiator agent and with reaction temperatures set at 60oC, 70oC, 80oC. The percent conversion of polymerization was determined using the Hubl method to investigate the effects of three factors: initiator agent concentration, monomer concentration and reaction temperature. Furthermore, the chemical structure and the responsiveness of the PNVCL polymer were analyzed using Fourier transform infrared spectroscopy (FTIR) and UV-vis spectrometer, respectively. The study revealed that increasing the reaction temperature, initiator concentration, and monomer concentration resulted in higher percent conversion of polymerization. Finally, the obtained polymer demonstrated thermal sensitivity within the range of 32oC to 38oC, which is close to human body temperature, suitable for biomedical applications.

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热响应聚（N-乙烯基己内酰胺）的聚合：温度、引发剂和单体浓度对转化率的影响

聚（N-乙烯基己内酰胺）（PNVCL）是一种热响应聚合物。其温度响应特性使其成为各种应用的理想候选材料。我们使用不同量的偶氮二异丁腈（AIBN）作为引发剂，通过自由基聚合反应合成了一系列对温度敏感的 PNVCL，反应温度分别为 60oC、70oC 和 80oC。采用 Hubl 方法测定了聚合转化率，以研究引发剂浓度、单体浓度和反应温度这三个因素的影响。此外，还分别使用傅立叶变换红外光谱仪（FTIR）和紫外可见光谱仪分析了 PNVCL 聚合物的化学结构和反应性。研究表明，提高反应温度、引发剂浓度和单体浓度可提高聚合转化率。最后，获得的聚合物在 32oC 至 38oC 范围内表现出热敏性，接近人体温度，适合生物医学应用。

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Vietnam Journal of Catalysis and Adsorption

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