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以一种新的Y型乳化剂 1 2 丁酰氧基 9 十八烯酸 (BOA) ,制备了甲基丙烯酸甲酯 (MMA)含量高达 2 0 %的微乳液 ,并以油溶性引发剂偶氮二异丁腈 (AIBN)引发其聚合 .实验表明 ,与单体含量较低的微乳液聚合相比 ,MMA在其含量较高的微乳液中聚合时表现出一些明显不同的特征 ,如在聚合初期 ,聚合主要在大粒子内进行 .MMA的聚合与非极性单体的微乳液聚合相比也比较特殊 ,其聚合速度和聚合物分子量与引发剂浓度、单体浓度及乳化剂浓度的关系如下 :Rp ∝ [AIBN]0 .83 [MMA ]0 .49[BOA]-0 .98,Mn ∝ [AIBN]-0 .2 9[MMA]0 .61[BOA]-0 .2 2 .
A new Y-type emulsifier 1 2 butyroxy 9-octadecenoic acid (BOA) was used to prepare a microemulsion containing up to 20% of methyl methacrylate (MMA) with an oil-soluble initiator Azobisisobutyronitrile (AIBN) initiates its polymerization.Experiments have shown that MMA exhibits some distinctly different characteristics when polymerized in higher levels of microemulsions compared to the less polymerized microemulsions, as shown in In the early stage of polymerization, the polymerization is mainly carried out in large particles, and the polymerization of MMA is quite special compared with the microemulsion polymerization of non-polar monomers. The polymerization rate, polymer molecular weight and initiator concentration, monomer concentration and emulsifier concentration The relationship is as follows: Rp α [AIBN] 0.83 [MMA] 0.49 [BOA] -0.98, Mn α [AIBN] -0.29 [MMA] 0.61 [BOA] -0.22.