本文選題：鈧　切入點(diǎn)：對(duì)氟苯乙烯　出處：《高分子學(xué)報(bào)》2017年12期

【摘要】：采用(C5Me4Si Me3)Sc(CH2C6H4NMe2-o)2(1)和(C5Me4Si Me3)Sc(CH2Si Me3)2(THF)(2)2種單茂鈧催化劑,考察了其催化對(duì)氟苯乙烯均聚合以及與乙烯共聚合的性能,并通過(guò)1H-NMR、13C-NMR、GPC和DSC對(duì)所獲聚合物的微觀結(jié)構(gòu)和熱性能進(jìn)行了分析.結(jié)果表明,單茂鈧1可以催化對(duì)氟苯乙烯均聚合,獲得間規(guī)聚合物,但聚合活性較低.采用單茂鈧2,控制溶劑種類(lèi)和用量可以獲得間規(guī)和無(wú)規(guī)2類(lèi)聚合物:控制對(duì)氟苯乙烯單體在氯苯溶劑中濃度低于2.4 mol/L,可獲得間規(guī)聚對(duì)氟苯乙烯(rrrr≥99%,Tm≥319oC),且聚合活性高達(dá)105 g polymer molSc-1 h-1;控制對(duì)氟苯乙烯單體在氯苯溶劑中濃度高于4.8 mol/L或者選用氟苯做溶劑,可獲得無(wú)規(guī)聚對(duì)氟苯乙烯;固定單體濃度調(diào)控對(duì)氟苯乙烯和催化劑的比例,可獲得分子量(Mn)在3.10×104~2.08×105間調(diào)控的間規(guī)和無(wú)規(guī)聚對(duì)氟苯乙烯.在常壓乙烯下,單茂鈧1和2還可以催化對(duì)氟苯乙烯與乙烯共聚合,獲得了組成(對(duì)氟苯乙烯含量41 mol%~88 mol%)和分子量(3.10?104~1.84?105)可控的兩元共聚物,共聚合活性高達(dá)106 g polymer molSc-1 h-1.當(dāng)共聚物中乙烯含量高于對(duì)氟苯乙烯含量時(shí),共聚物僅有源自聚乙烯嵌段的熔點(diǎn)(119~126oC).當(dāng)共聚物中對(duì)氟苯乙烯含量高于乙烯含量時(shí),共聚物出現(xiàn)聚對(duì)氟苯乙烯嵌段;由單茂鈧1獲得聚對(duì)氟苯乙烯嵌段為間規(guī)結(jié)構(gòu),共聚物具有熔點(diǎn)(269~282oC)和玻璃化轉(zhuǎn)變溫度(Tg,79~82oC);單茂鈧2獲得聚氟苯乙烯嵌段為無(wú)規(guī)結(jié)構(gòu),共聚物僅有1個(gè)Tg(94~96oC).
[Abstract]:The results show that scandium monocene 1 can catalyze homopolymerization of p-fluorostyrene to obtain syntactic polymer, but the polymerization activity is low.Using scandium monocene 2, the syndiotactic and random polymers can be obtained by controlling the type and amount of solvents. Controlling the concentration of p-fluorobenzene monomer in chlorobenzene solvent below 2.4 mol / L, the syndiotactic poly (p-fluorobenzene) rrr r r r 鈮，

本文編號(hào)：1727375