期刊
ADVANCED MATERIALS
卷 31, 期 26, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201806484
关键词
bottlebrush; comb; extensional rheology; linear rheology; strain hardening; zero shear viscosity
类别
资金
- Alexander von Humboldt Foundation
- German Science Foundation [DFGWI1911/18-2]
Comb and bottlebrush polymers present a wide range of rheological and mechanical properties that can be controlled through their molecular characteristics, such as the backbone and side chain lengths as well as the number of branches per molecule or the grafting density. This review investigates the impact of these characteristics specifically on the zero shear viscosity, strain hardening behavior, and plateau shear modulus. It is shown that for a comb polymer with an entangled backbone and entangled side chains, a maximum in the strain hardening factor and minimum in the zero shear viscosity eta(0) can be achieved through selection of an optimum number of branches q. Bottlebrush polymers with flexible filaments and extremely low plateau shear moduli relative to linear polymers open the door for a new class of solvent-free supersoft elastomers, where their network modulus can be controlled through both the degree of polymerization between crosslinks, n(x), and the length of the side chains, n(sc), with GBB0 approximate to rho kTnx-1(nsc+1)-1.
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