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Synthesis of Interpenetrating Polymer Networks Based on Triisocyanate-Terminated and Modified Poly(urethane-imide) with Superior Mechanical Properties.

ABSTRACT: Interpenetrating 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.

SUBMITTER: Ma R

PROVIDER: S-EPMC7114687 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Synthesis of Interpenetrating Polymer Networks Based on Triisocyanate-Terminated and Modified Poly(urethane-imide) with Superior Mechanical Properties.

Ma Rui R Zhao Tianbo T Pu Hongrong H Sun Mingliang M Cui Yonghong Y Xie Xiaoqian X

ACS omega 20200320 12

Interpenetrating 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 ...[more]

PMID: 32258927

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Project description:The purpose of this work was to investigate the effect of multifunctionality on material properties of synthetic polymer aerogels. For this purpose, we present the synthesis and characterization of monolithic dendritic-type urethane-acrylate monomers based on an aliphatic/flexible (Desmodur N3300), or an aromatic/rigid (Desmodur RE) triisocyanate core. The terminal acrylate groups (three at the tip of each of the three branches, nine in total) were polymerized with 2,2'-azobis(isobutyronitrile) (AIBN) via free radical chemistry. The resulting wet-gels were dried with supercritical fluid (SCF) CO?. Aerogels were characterized with ATR-FTIR and solid-state 13C NMR. The porous network was probed with N?-sorption and scanning electron microscopy (SEM). The thermal stability of aerogels was studied with thermogravimetric analysis (TGA). Most aerogels were macroporous materials (porosity > 80%), with high thermal stability (up to 300 °C). Aerogels were softer at low monomer concentrations and more rigid at higher concentrations. The material properties were compared with those of analogous aerogels bearing only one acrylate moiety at the tip of each branch and the same cores, and with those of analogous aerogels bearing norbornene instead of acrylate moieties. The nine-terminal acrylate-based monomers of this study caused rapid decrease of the solubility of the growing polymer and made possible aerogels with much smaller particles and much higher surface areas. For the first time, aliphatic/flexible triisocyanate-based materials could be made with similar properties in terms of particle size and surface areas to their aromatic/rigid analogues. Finally, it was found that with monomers with a high number of crosslinkable groups, material properties are determined by multifunctionality and thus aerogels based on 9-acrylate- and 9-norbornene-terminated monomers were similar. Materials with aromatic cores are carbonizable with satisfactory yields (20?30% w/w) to mostly microporous materials (BET surface areas: 640?740 m² g-1; micropore surface areas: 360?430 m² g-1).

Dataset Information

Synthesis of Interpenetrating Polymer Networks Based on Triisocyanate-Terminated and Modified Poly(urethane-imide) with Superior Mechanical Properties.

Publications

Synthesis of Interpenetrating Polymer Networks Based on Triisocyanate-Terminated and Modified Poly(urethane-imide) with Superior Mechanical Properties.

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