Synthesis and thermal degradation property study of N-vinylpyrrolidone and acrylamide copolymer
Synthesis and thermal degradation property study of N-vinylpyrrolidone and acrylamide copolymer
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DOI：
10.1039/c4ra05720a
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发表时间：
2014-07
期刊：
影响因子：
3.9
通讯作者：
Lili Xu;Li Che;Jing Zheng;Guangsu Huang;Xiaorong Wu;Peng-yuan Chen;Liyu Zhang;Qiaoman Hu
中科院分区：
文献类型：
--
作者：
Lili Xu;Li Che;Jing Zheng;Guangsu Huang;Xiaorong Wu;Peng-yuan Chen;Liyu Zhang;Qiaoman Hu
采用自由基溶液聚合法制备了不同n -乙烯基吡罗烷酮（NVP）含量的丙烯酰胺（AM）共聚物。采用傅里叶变换红外光谱仪（FTIR）和核磁共振（H NMR）分析了聚丙烯酰胺（PAM）及其共聚物的化学结构。利用差示扫描量热法（DSC）、热重分析（TGA）、热重分析耦合傅立叶变换红外光谱（TGA- ftir）等多种技术对NVP在共聚物热降解中的作用进行了系统的研究。DSC测量结果表明，共聚物的玻璃化转变温度（Tg）提高了18℃，这意味着在NVP含量为10%时热稳定性更好。TGA-FTIR分析表明，共聚物中的低温热解产物（如氨和酰胺）被减缓，直到NVP在400℃左右裂解。此外，仅在350°C以上的共聚物中检测到源自亚胺或分离的酰胺分解的腈，从另一个角度验证了共聚物中的酰胺或亚胺基团也受到NVP的保护。这些结果还表明，NVP在加热作用下与酰胺基团形成氢键，促进远端基团或分子间交联。
A series of acrylamide (AM) copolymers with various N-vinylpyrrolidone (NVP) contents were prepared by free radical solution polymerization. The chemical structures of polyacrylamide (PAM) and its copolymers were analyzed by Fourier transform infrared spectrometer (FTIR) and H NMR. Systematic investigations had been carried out to reveal the role of NVP in copolymer thermal degradation using a variety of techniques, such as differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), thermogravimetric analysis coupled Fourier transform infrared spectroscopy (TGA-FTIR). The DSC measurement showed an increase of 18 °C in the glass transition temperature (Tg) for the copolymer, meaning better thermal stability at 10% NVP content. TGA-FTIR analysis revealed that in the copolymer, low temperature pyrolysis products, such as ammonia and amides, were slowed down until NVP cleaved at about 400 °C. Furthermore, nitriles, which were derived from imide or isolated amide breakdown, were only detected in the copolymer over 350 °C, verifying that the amide or imide groups in the copolymer were also protected by NVP from another point of view. These results also revealed that NVP formed hydrogen bonds with amide groups and promoted the remote side group or inter-molecule crosslinking under heating.