Coordinative Chain Transfer Polymerization of Sustainable Terpene Monomers Using a Neodymium-Based Catalyst System
2022; Multidisciplinary Digital Publishing Institute; Volume: 14; Issue: 14 Linguagem: Inglês
10.3390/polym14142907
ISSN2073-4360
AutoresTeresa Córdova, Francisco Javier Enríquez‐Medrano, Eduardo Martínez Cartagena, Arnulfo Banda Villanueva, Luis Valencia, E.N. Cabrera-Álvarez, Ricardo López-González, Ramón Díaz de León,
Tópico(s)Synthetic Organic Chemistry Methods
ResumoThe present investigation involves the coordinative chain transfer polymerization (CCTP) of biobased terpenes in order to obtain sustainable polymers from myrcene (My) and farnesene (Fa), using the ternary Ziegler-Natta catalyst system comprising [NdV3]/[Al(i-Bu)2H]/[Me2SiCl2] and Al(i-Bu)2H, which acts as cocatalyst and chain transfer agent (CTA). The polymers were produced with a yield above 85% according to the monomeric consumption at the end of the reaction, and the kinetic examination revealed that the catalyst system proceeded with a reversible chain transfer mechanism in the presence of 15-30 equiv. of CTA. The resulting polyterpenes showed narrow molecular weight distributions (Mw/Mn = 1.4-2.5) and a high percent of 1,4-cis microstructure in the presence of 1 equiv. of Me2SiCl2, having control of the molecular weight distribution in Ziegler-Natta catalytic systems that maintain a high generation of 1,4-cis microstructure.
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