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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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手性荧光聚合物微球的合成及表征
DOI: 10.11777/j.issn1000-3304.2015.15076, PP. 1322-1327
Keywords: 手性,聚乙炔,螺旋构象,荧光,纳米粒子
Abstract:
利用丙炔胺分别和Boc-L-丙氨酸及丙烯酸反应合成了Boc-L-丙氨酸丙炔酰胺和丙烯酸丙炔酰胺2种单体,即手性单体1和非手性单体2.以(nbd)Rh+[η6-C6H5B-(C6H5)3]为催化剂将2种单体进行共聚制得产率为60%,相对数均分子量Mn=2.0×104的新型螺旋聚合物.圆二色光谱(CD)及紫外-可见(UV-Vis)吸收光谱表征发现聚合物具有很强的光学活性且能形成单一方向的螺旋构象.共聚物的螺旋构象不受非手性单体的影响,共聚物的光学活性及CD吸收峰的强度比均聚物略低.在三氟乙酸/二氯甲烷混合溶液作用下将聚合物侧链上的叔丁氧羰基(Boc)基团脱除得到带有氨基的螺旋聚合物.利用缩合方法将带有氨基的螺旋聚合物接枝到改性后的SiO2纳米粒子表面,经热失重曲线计算得到表面接枝密度σ=2.4μmol/m2.最后采用蒸馏-沉淀聚合方法制备手性荧光聚合物微球,并利用TEM及SEM观察手性荧光聚合物微球的表面形貌及粒径.紫外-可见吸收光谱及荧光光谱表明新型手性荧光聚合物微球具有一定的荧光性能,并将在药物运载、生物标记学领域发挥作用.
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