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在两亲聚苯乙烯-丙烯酸嵌段共聚物(简称PS-b-PAA)的水溶液中合成了球形碳酸钙复合物.扫描电子显微镜(SEM),X射线衍射(XRD)分析表明:所合成的复合物球径随PS-b-PAA浓度增加而减小,其中碳酸钙为方解石晶型但其微晶尺寸及形貌则各有差异.运用红外和TG-DTA分析了复合物中各组分及其对应的热分解行为,表明复合物由PS-b-PACa和纳米CaCO3微晶组成,其中PS段在330℃左右分解,而PACa段在400℃以上分解,在复合物中的热稳定性明显提高,且有规律性变化.利用匹配理论初步解释了共聚物浓度条件的改变导致了复合物特殊而规律性的内部微晶性质、外部形貌特征和热分解行为.
The spherical calcium carbonate composites were synthesized in aqueous solution of amphiphilic polystyrene-acrylic block copolymer (PS-b-PAA). The SEM and XRD results showed that the synthesized The diameter of the composite decreases with the increase of the concentration of PS-b-PAA, in which calcium carbonate is the calcite crystal type but its crystallite size and morphology are different.Using infrared and TG-DTA, And its corresponding thermal decomposition behavior, indicating that the complex consists of PS-b-PACa and nano-CaCO3 crystallites, in which the PS segment decomposition at about 330 ℃, while the PACa segment decomposition above 400 ℃, the thermal stability of the complex Obviously increased and regular changes.The matching theory was used to explain the changes of the copolymer concentration conditions, which led to the special and regular internal microcrystal properties, external topography and thermal decomposition behavior of the composites.