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利用呋喃环侧基与单烯化合物所发生的Diels-Alder(DA)环加成反应,大幅度降低呋喃环在共聚物中的含量,从而制备出空气氛下稳定性较好的二氧化碳共聚物.研究发现DA反应的环加成程度越高,呋喃甲基缩水甘油醚/二氧化碳共聚物(PFGEC)的空气稳定性越好,当环加成程度超过70%时,可以得到稳定产物.DA反应条件对环加成程度影响较大,以N-苯基马来酰亚胺为例,最高环加成程度可达84.1%.此外,还发现DA反应在一定的温度下存在一定的可逆性,环加成产物在100℃左右可快速发生解离,即发生r-DA反应.
The Diels-Alder (DA) cycloaddition reaction between the side chain of furan ring and mono-olefin compound greatly reduces the content of furan ring in the copolymer, so as to prepare a carbon dioxide copolymer with good stability under air atmosphere. It was found that the higher the degree of cycloaddition of DA reaction, the better the air stability of furan methyl glycidyl ether / carbon dioxide copolymer (PFGEC), and the stable product can be obtained when the degree of cycloaddition exceeds 70% .DA reaction conditions For example, N-phenylmaleimide, the highest degree of cycloaddition up to 84.1%. In addition, DA reaction also found that there is a certain degree of reversibility of the temperature, the ring Addition products at about 100 ℃ can quickly dissociate, that is, r-DA reaction occurred.