摘要
应用Fe(acac)3Al(iBu)3(acac=乙酰丙酮)催化苯乙烯马来酸酐共聚,制得富于交替的白色粉末共聚物.共聚反应动力学研究表明,共聚反应与单体浓度呈一级关系,表观活化能为486kJ/mol.
The
characteristics and product structure of alternating copolymerization of styrene with maleic
anhydride catalyzed by Fe(acac)\-3\|Al(i\|Bu)\-3 are presented and discussed in the present
paper.The copolymer was characterized by IR and elementary analysis.The copolymer is a
product of high alternation. Maleic anhydride and styrene are 53.3% and 46.7%,respectively in
the copolymer.The copolymerization can be realized in the solvents such as aromatic
hydrocarbon and alkane.The yield is higher in aromatic hydrocarbon than in the others.The third
composition exerts a great influence on the copolymerization. Molecular weight and yield of
copolymer are lower with the third composition of ,\|dipyridel,8\|hydroxy quindine,pyridine and
acetone than that without the third cmposition. The yield of copolymer is higher with the third
composition of tetrachoro\|methane than that without the third composition. Molecular weight of
copolymer increases as Al/Fe molar ratio increases. But the yield of copolymer dereas as Al/Fe
molar ratio increases. The suitable Al/Fe molar ratio is four. The yield of copolymer increases
and molecular weight decreases as concentration of catalysts increases. The suitable
concentration of catalysts is \Fe\]=1.510-2mol/L. The copolymerization can be obtained at room
temperature, however, the increasing reaction temperature causes an increase of the
copolymer yield and a drop of molecular weight of the polymer produced. The suitable
temperature is 5060. The yield and molecular weight of the polymer grow with increasing
polymerization time. The kinetic studies indicate that the rate of copolymerization reaction is
first order with respect to monomer concentration. E equals 48.6 kJ/mol. The reaction
mechanism studies indicate that the copolymerization reaction exhibits the coordinate
mechanism.\=
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1999年第4期465-469,共5页
Acta Polymerica Sinica
关键词
铁
催化剂
苯乙烯
马来酸酐
交替共聚物
共聚物
Fe\|Al complex catalyst,Alternating copolymerization,Maleic
anhydride,Styrenese