ma9b02646_si_001.pdf (3.25 MB)
Toward More Sustainable Elastomers: Stereoselective Copolymerization of Linear Terpenes with Butadiene
journal contribution
posted on 2020-02-24, 19:12 authored by David
Hermann Lamparelli, Veronica Paradiso, Francesco Della Monica, Antonio Proto, Silvia Guerra, Luca Giannini, Carmine CapacchioneThe copolymerization of renewable
monomers such as ocimene (O), myrcene (M), and farnesene (F) with butadiene (B),
promoted by dichloro{1,4-dithiabutanediyl-2,2′-bis[4,6-bis(2-phenyl-2-propyl)phenoxy]}titanium
(1) activated by modified methylalumoxane (m-MAO) under
mild reaction conditions, was investigated. Copolymers in a wide range
of compositions were obtained through a judicious control of the alimentation
feed (up to 85% of terpene incorporated in the case of poly(ocimene–butadiene)
(POB)). Analysis of POB, poly(myrcene–butadiene) (PMB), and poly(farnesene–butadiene) (PFB) microstructures revealed the good stereoselectivity of 1, both in the butadiene (up to 95%) and in the terpene (up to 92%,
71%, and 86% for O, M, and F, respectively) insertion. For all these new materials, a complete 13C NMR assignment was performed, revealing a multiblock structure.
A sample of POB was also evaluated as a component in
a model tread compound leading to improved mechanical properties with
respect to the corresponding plain butadiene rubbers.