苯丙炔酸上的羧基起到终止剂的作用,限制了苯丙炔酸的聚合。加入NaOH将单体转化成钠盐,聚合后用HCl酸化成聚苯丙炔酸。单体由肉桂酸和液溴通过先加成后消去反应制得。利用红外光谱、紫外光谱、荧光光谱、凝胶渗透色谱和TGA对单体及聚合物的结构和性能进行了表征,2212cm-1处C≡C键伸缩振动特征吸收峰消失形成1602cm-1C—C键伸缩振动特征峰,表明了聚合物的合成。荧光光谱显示聚苯丙炔酸在375nm激发波长下发蓝光,于465nm处有特征荧光发射峰,与没有加NaOH聚合的聚合物相比较,紫外吸收波长范围更大,加碱聚合的聚苯丙炔酸分子量能达到10552,TGA测试结果表明聚苯丙炔酸具有一定的热稳定性。
Acetic acid of phenylpropiolic acid （PhPA） is an effective terminator, so PhPA can not be directly pol- ymerized. After adding NaOH, the monomer is conversion into sodium salt. Then phenylpropiolic acid salt was polymerized into phenylpropiolic acid salt. With HC1 acidification, we can get phenylpropiolic acid. The mono- mer was synthesized by the addition reaction of cinnamic acid with bromine and the followed elimination reac- tion. The structure and properties of both PhPA and PPhPA were confirmed by IR, UV, FS, GPC and TGA. The disappearance of the characteristic vibrations at 2212cm^-1 （C =C ） and the appearance of the characteristic vibrations at 1602cm^-1 （ C=C ） indicated the polymerization of monomers （Mw = 10552） which has higher mo- lecular weight and absorption spectra than without NaOH. On the fluorescence investigation of the polymer, the solutions of polymer emit blue light and show the peak emissions at 465 nm when excited at 375 nm. The polymer also has thermal stability.
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