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Synthesis of Interpenetrating Polymer Networks Based on Triisocyanate-Terminated and Modified Poly(urethane-imide) with Superior Mechanical Properties
journal contribution
posted on 2020-03-20, 08:37 authored by Rui Ma, Tianbo Zhao, Hongrong Pu, Mingliang Sun, Yonghong Cui, Xiaoqian XieInterpenetrating polymer networks
(IPNs) based on triisocyanate-terminated
poly(urethane-imide)s (PUIs) were prepared by in situ interpenetrating
reactions between modified polyurethane (PU) with different ratios
of polyimide (PI). The effects of PU, which was made from hydroxyl-terminated
polybutadiene modified with triisocyanate, and the amounts of PI on
the mechanical properties, thermal properties, and crystalline character
of the IPNs were discussed. Triisocyanate-terminated PUI showed that
the highest tensile strength was 38 times that of the diisocyanate-terminated
materials. Supramolecular cross-linking from an additional hydrogen-bonding
network of modified PU and the degree of interpenetration with a regular
imide structure of PI were introduced, which accounted for the remarkable
improvement in mechanical properties of IPNs. Preferable thermal stability
and glass transition temperature for the hard segment of IPNs were
rewarded with increasing PI content. X-ray diffraction revealed vigorous
segmental mixing between the soft and hard segments of modified PUI.
Scanning electron micrographs showed the “fibrous assembly”
morphology and short-range-ordered structure of modified PUI.
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glass transition temperatureScanning electron micrographsTriisocyanate-terminated PUIPI contentSupramolecular cross-linkingshort-range-ordered structureimide structureInterpenetrating Polymer Networksdiisocyanate-terminated materialshydrogen-bonding networkSuperior Mechanical Properties Interpenetrating polymer networksinterpenetrating reactionsIPNhydroxyl-terminated polybutadiene38 timesX-ray diffraction
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