N-丁基马来酰亚胺/苯乙烯微乳液共聚合研究

研究了氘代氯仿中Ｎ－丁基马来酰亚胺（ＮＢＭＩ）和苯乙烯（Ｓｔ）的络合性能。以十二烷基硫酸钠（ＳＤＳ）和正戊醇（ＰＴＬ）为复合乳化剂，配制了含有ＮＢＭＩ（Ｍ１）和Ｓｔ（Ｍ２）的Ｏ／Ｗ微乳液。用过硫酸钾引发该体系进行微乳液共聚合。固定乳化剂的浓度为〔ＳＤＳ〕＝０．２１ｍｏｌ／Ｌ，〔ＰＴＬ〕＝０．２８ｍｏｌ／Ｌ，详细研究了聚合温度、单体配比和引发剂用量对共聚合动力学的影响。用元素分析法确定共聚物的组成，

Studies on Microemulsion Copolymerization of N-Butyl Maleimide and Styrene

The complexion properties of N-butyl maleimide(NBMI) and styrene(St) in CDCl_3 were studied firstly. By using sodium dodecyl sulfate(SDS) and pentanol(PTL) as emulsifier, the oil-in-water microemulsion containing NBMI and St was prepared. The microemulsion copolymerization was carried out in ampoules with potassium persulfate(KPS) as initiator. The effects of reaction temperature, molar fraction of monomer and initiator concentration on the copolymerization kinetics were studied in detail under the condition of keeping the emulsifier concentration at 0.21 mol/L SDS and 0.28 mol/L PTL. Monomer reactivity ratios of comonomer pairs were determined by a Lewis and Mayo method. Meanwhile, the effects of monomer feed on the T_g and intrinsic viscosity of poly(NBMI-co-St)s were also investigated. The experiment results showed that the T_g of alternating poly(NBMI-co-St) was 421.6 K, and the monomer reactivity ratios of NBMI(M_1) and St(M_2) were 0.05(r_1) and 0.08(r_2), respectively. Moreover, it was found that the resulting copolymer was of alternating structure when the molar fraction of NBMI(f_1) varied from 0.4 to 0.7.