Soluble neodymium chloride 2-ethylhexanol complex as a highly active catalyst for controlled isoprene polymerization


Autoria(s): Ren CY; Li GL; Dong WM; Jiang LS; Zhang XQ; Wang FS
Data(s)

2007

Resumo

Soluble NdCl3 center dot 3EHOH (2-ethyl hexanol) in hexane combined with AlEt3 is highly active for isoprene polymerization in hexane. The NdCl3 center dot 3EHOH/AlEt3 has higher activity than the typical binary catalyst NdCl3 center dot 3(i)PrOH (isopropanol)/AlEt3 and ternary catalyst NdV3 (neodymium versatate)/AlEt2Cl/Al(i-Bu)(2)H. The molecular weight of polyisoprenes can be controlled by variation of [Nd], [Al]/[Nd] ratio and polymerization temperature and time. The NdCl3 center dot 3EHOH/AlEt3 catalyst polymerized isoprene to afford products featuring high cis-1,4 stereospecificity (ca. 96%), high molecular weight (ca. 10(5)) and relatively narr ow molecular weight distributions (M-w/M-n = 2.0-2.8) simultaneously. More importantly, some living polymerization characteristics were demonstrated: (a) absence of chain termination; (b) linear correlation between M-n and polymer yield; (c) increment of molecular weight in the 'seeding' polymerization. Though some deviation from the typical living polymerization such as molecular weight distribution is not narrow enough and the line of M-n and polymer yield does not extrapolate to zero, controlled polymerization with the current catalyst can still be concluded.

Identificador

http://ir.ciac.jl.cn/handle/322003/13231

http://www.irgrid.ac.cn/handle/1471x/149030

Idioma(s)

英语

Fonte

Ren CY;Li GL;Dong WM;Jiang LS;Zhang XQ;Wang FS.Soluble neodymium chloride 2-ethylhexanol complex as a highly active catalyst for controlled isoprene polymerization,POLYMER ,2007 ,48(9):2470-2474

Palavras-Chave #METHYLALUMINOXANE CATALYST #BUTADIENE #1 #1 #SYSTEMS #3-BUTADIENE #3-DIENES
Tipo

期刊论文