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Synthesis and characterization of high cis ‐polymyrcene using neodymium‐based catalysts
Author(s) -
Díaz de León Gómez Ramón Enrique,
EnríquezMedrano Francisco Javier,
Maldonado Textle Hortensia,
Mendoza Carrizales Ricardo,
Reyes Acosta Karina,
López González Héctor Ricardo,
Olivares Romero José Luis,
Lugo Uribe Luis Edmundo
Publication year - 2016
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.22458
Subject(s) - catalysis , polymer , neodymium , monomer , polymerization , stereospecificity , polymer chemistry , cyclohexane , borane , chemistry , molecular mass , selectivity , materials science , organic chemistry , laser , enzyme , physics , optics
The monomer β ‐myrcene, a renewable resource, was polymerized in cyclohexane using two different Ziegler‐Natta catalyst systems based on neodymium Nd(O i‐ Pr) 3 and NdV 3 . The Nd(O i‐ Pr) 3 was combined with [HNMe 2 Ph][B(C 6 F 5 ) 4 ] (or [CPh 3 ][B(C 6 F 5 ) 4 ]) and Al( i ‐Bu) 3 (or Al( i ‐Bu) 2 H). Next, the NdV 3 was activated using Al( i ‐Bu) 3 and AlEt 2 Cl. Both catalyst systems exhibited high polymer yields near 100 % in the established reaction time, high polymer molecular masses, and broad molecular mass distributions. The catalyst systems gave an effective and stereospecific polymerization reaction of β ‐myrcene providing high cis selectivity of 1,4‐polymyrcenes (> 92 %) with a glass transition temperature between −66 and −62 °C. The above‐mentioned features of resulting elastomers in conjunction with the polymer's molecular masses and molecular mass distributions proved to be sensitive to borane and alkylaluminum compounds molar ratios, [B]/[Nd] and [Al]/[Nd] using Nd(O i‐ Pr) 3 and [Cl]/[Nd] and [Al]/[Nd] with NdV 3 .