中文摘要：

以苯乙烯基团封端的聚丙烯（PP—t—St）为起始物，通过马氏加成反应将溴化氢（HBr）加成到该聚丙烯的苯乙烯双键上，得到了苄基溴基团封端的等规聚丙烯（PP—tBzBr）．以PP—t—BzBr为大分子引发剂，引发含磷烯烃单体4．乙烯基苄基膦酸二乙酯（DEVBP）的原子转移自由基聚合（ATRP），合成了一种新型聚丙烯一聚磷酸酯嵌段共聚物（PP—b—PDEVBP，其中PDEVBP嵌段质量含量可达64．3％）．对该共聚物进行了’H—NMR表征、示差扫描量热（DSC）、热失重（TGA）和微型量热（MCC）分析，结果表明该嵌段共聚物在保持聚丙烯本身的熔点和结晶度的同时，有效降低了热释放速率和提高了高温热分解残余物，可望改善聚丙烯材料的阻燃性．

英文摘要：

Novel phosphorus-containing polypropylene diblock copolymers were synthesized and their thermal decomposing behaviors and flammability were characterized by thermo-gravimetric analysis （TGA） and micro- scale combustion calorimetry （MCC）. First, a reactive polypropylene precursor with a terminal styryl group （PP-t-St） at polymer chain end was synthesized via controlled chain transfer reaction to 1,4-divinylbenzene and hydrogen in metallocene-mediated propylene polymerization. Then PP-t-St was reacted with hydrogen bromide through Markovnikov addition in a quasi-quantitative manner, affording 1-bromoethylbenzene group- terminated polypropylene （PP-t-BzBr）. ATRP of phosphorous-containing vinyl monomer such as diethyl-（4- vinylbenzyl） phosphonate （DEVBP） was carried out in toluene at elevated temperatures with PP-t-BzBr suspending in the reactant solution, with CuC1/1,1,4,7,10,10-hexamethyltriethylenetetramine （HMTETA） as catalyst. Diblock copolymers containing different amounts of DEVBP units （up to 64.3 wt% ） were obtained by adjusting polymerization durations. Differential scanning calorimetry （DSC） experiments indicated that both the crystallinity and crystallization rate of PP were largely retained in PP-b-PDEVBP diblock copolymers. TGA and MCC results showed that char residues increased while heat release rates reduced upon forming the diblock copolymers as compared to the precursory PP-t-BzBr as well as PP-t-St. Overall,this research may lead to a new solution to inherently flame-retardant polypropylene.