Dendronized Polymers with Ureidopyrimidinone Groups:
An Efficient Strategy To Tailor Intermolecular Interactions, Rheology,
and Fracture
Posted on 2017-06-19 - 18:52
A library of poly(methyl
methacrylate)-based dendronized polymers
with generation numbers g = 1–3 was prepared,
which contain different degrees of dendritic substitution (0–50%)
with strongly hydrogen bonding 2-ureido-4[1H]pyrimidinone
(UPy) moieties at their respective g = 1 levels.
Our rheological and thermal studies demonstrate that the strong intermolecular
UPy interactions are suppressed for g = 2 and essentially
eliminated for g = 3. Focusing on samples with short
backbone degrees of polymerization (Pn ≈ 40), the linear viscoelastic response alters from liquid-like
in the absence of UPy to gel-like with ever increasing moduli as the
UPy content increases. Nonlinear rheological measurements indicate
a transition from ductile to brittle behavior and, in parallel, a
transition from shear strain thinning to shear strain hardening. This
unique behavior makes UPy-DPs promising candidates for the design
of new functional materials.
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Scherz, Leon F.; Costanzo, Salvatore; Huang, Qian; Schlüter, A. Dieter; Vlassopoulos, Dimitris (2017). Dendronized Polymers with Ureidopyrimidinone Groups:
An Efficient Strategy To Tailor Intermolecular Interactions, Rheology,
and Fracture. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.7b00747
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AUTHORS (5)
LS
Leon F. Scherz
SC
Salvatore Costanzo
QH
Qian Huang
AS
A. Dieter Schlüter
DV
Dimitris Vlassopoulos