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Synthesis of high cis-1,4 polybutadiene with narrow molecular weight distribution via a neodymium-based binary catalyst.

ABSTRACT: This work explores the synthesis of polybutadiene (PB) with high cis-1,4 unit content and narrow molecular weight distribution using a neodymium-based complex, consisting of neodymium(iii) trifluoromethane sulfonate (Nd(CF3SO3)3) and coordinated with tris(2-ethylhexyl)phosphate (TOP). The complex's composition and structure are characterized by elemental analysis, XPS and FT-IR. Combined with Al(i-Bu)3, a binary catalyst is obtained and then applied to initiate the polymerization of butadiene. Results indicate that the catalyst system displays a high catalyst activity and the product polymer (PB) features a high cis-1,4 content (98.8%) and a remarkably narrow molecular weight distribution (M w/M n = 1.32). Compared with PB initiated by the current well-studied catalyst Nd(CF3SO3)3*3TBP/Al(i-Bu)3, the Nd(CF3SO3)3*3TOP allows significantly narrowing the molecular weight distribution of the PB, because the Nd(CF3SO3)3*3TOP is more easily dissolved in hexane. Therefore, butadiene was polymerized in a homogenous system and each monomer's polymerization was initiated in the single molecular state.

SUBMITTER: Liu J 

PROVIDER: S-EPMC9081107 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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Synthesis of high <i>cis</i>-1,4 polybutadiene with narrow molecular weight distribution <i>via</i> a neodymium-based binary catalyst.

Liu Jie J   Fan Xiaodong X   Min Xin X   Zhu Xiuzhong X   Zhao Na N   Wang Zichao Z  

RSC advances 20180614 39

This work explores the synthesis of polybutadiene (PB) with high <i>cis</i>-1,4 unit content and narrow molecular weight distribution using a neodymium-based complex, consisting of neodymium(iii) trifluoromethane sulfonate (Nd(CF<sub>3</sub>SO<sub>3</sub>)<sub>3</sub>) and coordinated with tris(2-ethylhexyl)phosphate (TOP). The complex's composition and structure are characterized by elemental analysis, XPS and FT-IR. Combined with Al(i-Bu)<sub>3</sub>, a binary catalyst is obtained and then app  ...[more]

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