摘要：以醋酸乙烯酯（VAc）作為聚合單體，偶氮二異丁腈（AIBN），含乙烯基和二硫代酯結(jié)構(gòu)的v-RAFT作為鏈轉(zhuǎn)移劑和支化試劑，苯為溶劑在70oC下進(jìn)行可逆加成-斷裂轉(zhuǎn)移自由基（RAFT）聚合，制備出超支化聚醋酸乙烯酯，采用氣相色譜（GC）、核磁（1H-NMR）進(jìn)行跟蹤測(cè)定聚合過程，三檢測(cè)凝膠滲透色譜（GPC）表征分析超支化聚合物的支化結(jié)構(gòu)。通過研究聚合機(jī)理和支化聚合物結(jié)構(gòu)的表明：聚合過程中呈一級(jí)線性增長關(guān)系，符合活性可控的特征，當(dāng)反應(yīng)大概30小時(shí)左右單體的轉(zhuǎn)化率就能達(dá)到90%以上，基于RAFT試劑含有可聚合的乙烯結(jié)構(gòu)，聚合物的分子量分布隨著轉(zhuǎn)化率的提升不斷變寬，表明聚合物的支化結(jié)構(gòu)為逐步形成和發(fā)展的。根據(jù)凝膠滲透色譜（GPC）、核磁（1H-NMR）等手段的檢測(cè)手段進(jìn)一步深入研究聚合物的支化結(jié)構(gòu)，表明隨著單體的轉(zhuǎn)化率提升，聚合物的支化度不斷增加，高支化聚合物的組分不斷增加，但聚合物的PDI仍然比較小。

關(guān)鍵詞：聚合單體；可逆加成-斷裂轉(zhuǎn)移自由基聚合；醋酸乙烯酯

Abstract：Refined vinyl acetate as an initiator monomer , AIBN as catalyst system ,RAFT reagent as a chain transfer agent , Vinyl acetate occer Reversible Addition-Fragmentation Transfer Radical Polymerization at 70oC in Benzene.Using gas chromatography, gel permeation chromatography, nuclear magnetic track determination of the polymerization process , to characterize the branching structure of the polymer .

The studies on Polymerization mechanism and Characterization of polymer morphology:In the process of polymerization , from the kinetic curves can be seen , about 30 hours the conversion rate can reach more than 90%;According to Gel Permeation Chromatography(GPC),nuclear magnetic resonance (1H-NMR) , and other means of  detection of Reversible Addition-Fragmentation Transfer radical polymerization (RAFT) in the conversion of changing circumstances, the degree of branching of the polymer is increasing;Polymer with the reaction in the RAFT system, high component increasing , but the PDI of the polymer is still relatively low.

Key words：initiating monomer, Reversible Addition-Fragmentation Transfer radical polymerization, Vinyl acetate.