聚甲基丙烯酸甲酯(PMMA)在我国有数十万吨/年的市场需求，其中90%以上依靠进口，是因对聚合技术与设备的匮缺。采用反应挤出聚合技术，充分利用自动加速效应，将MMA与改性单体，增韧聚合物以及微纳米无机颗粒直接一步本体合成耐划伤，耐热，具有不同光散射率以及透明性和力学性能均优异的PMMA树脂。通过研究自动加速效应时MMA本体聚合反应的动力学，获取进入自动加速效应区MMA本体聚合的链终止速率常数kt，研究剪切速率与kt之间的对应关系，剪切速率与分子量分布之间的对应关系等，在保证满足反应挤出聚合要求的高聚合速率前提下，确定聚合速率、分子量及其分布三者之间的平衡点。不仅避免了通常MMA反应挤出聚合因停留时间过长而失去经济性，也避免了先预聚，再进行反应挤出,极易产生暴聚和难以稳定控制的缺陷。进而获取改性聚合物结构与微纳米无机颗粒种类与尺度对于PMMA光学性能影响的结果，为工业化提供理论依据。

The market of polymethylmethacrylate (PMMA) in our country is hundreds thousand of tons per year. However, over 90% of PMMA rely on import from other countries. The reason lies in the lack of polymerization techniques and equipments. In this work, we propose to prepare PMMA resin with scratch-proofness, heat resistance, different light scattering rates, excellent transparency and mechanic performance via reactive extrusion, which can take full advantage of the self-acceleration effect and convert the mixture of MMA, modifying monomers, toughening polymers and micro or nano inorganic particles into resin in one step. The chain termination constant kt of MMA bulk polymerization at the beginning of self-acceleration stage can be acquired based on the investigation of the kinetics of MMA bulk polymerization in the self-acceleration stage. The relationships between the shearing rate and kt, shearing rate and molecular weight distribution will be investigated. On the premise of ensuring high polymerization rate to meet the requirement of reactive extrusion, the equilibrium point of polymerization rate, molecular weight and its distribution should be found. This approach can avoid. the high cost owning to the long retention time as in the normal reactive extrusion process in which the polymerization is processed in two steps, first pre-polymerization and followed with reactive extrusion. And it can also eliminate the defects of difficulty in controlling the reaction rate and liability to burst polymerization during normal reactive extrusion process. Moreover, we will provide theoretical foundation of the industrialization of this technique based on the investigation of the effects of modified macromolecular structures, the type and size of micro or nano inorganic particles on the optical performance of PMMA.