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Semi-Interpenetrating Polymer Networks Based on Cyanate Ester and Highly Soluble Thermoplastic Polyimide

1
College of Chemical Engineering, Changchun University of Technology, Changchun 130012, China
2
Laboratory of Polymer Composites Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun 130022, China
3
Aerospace Research Institute of Special Materials & Technology, Beijing 100074, China
4
Ningbo Institute of Material Technology & Engineering, Chinese Academy of Science, Ningbo 315201, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(5), 862; https://doi.org/10.3390/polym11050862
Received: 24 April 2019 / Revised: 8 May 2019 / Accepted: 10 May 2019 / Published: 13 May 2019
(This article belongs to the Special Issue Thermosets II)
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PDF [2146 KB, uploaded 13 May 2019]
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Abstract

Thermoplastic polyimide (TPI) was synthesized via a traditional one-step method using 2,3,3′,4′-biphenyltetracarboxylic dianhydride (3,4′-BPDA), 4,4′-oxydianiline (4,4′-ODA), and 2,2′-bis(trifluoromethyl)benzidine (TFMB) as the monomers. A series of semi-interpenetrating polymer networks (semi-IPNs) were produced by dissolving TPI in bisphenol A dicyanate (BADCy), followed by curing at elevated temperatures. The curing reactions of BADCy were accelerated by TPI in the blends, reflected by lower curing temperatures and shorter gelation time determined by differential scanning calorimetry (DSC) and rheological measurements. As evidenced by scanning electron microscopy (SEM) images, phase separation occurred and continuous TPI phases were formed in semi-IPNs with a TPI content of 15% and 20%. The properties of semi-IPNs were systematically investigated according to their glass transition temperatures (Tg), thermo-oxidative stability, and dielectric and mechanical properties. The results revealed that these semi-IPNs possessed improved mechanical and dielectric properties compared with pure polycyanurate. Notably, the impact strength of semi-IPNs was 47%–320% greater than that of polycyanurate. Meanwhile, semi-IPNs maintained comparable or even slightly higher thermal resistance in comparison with polycyanurate. The favorable processability and material properties make TPI/BADCy blends promising matrix resins for high-performance composites and adhesives. View Full-Text
Keywords: thermoplastic polyimide; cyanate ester; semi-interpenetrating polymer network; toughness; dielectric properties thermoplastic polyimide; cyanate ester; semi-interpenetrating polymer network; toughness; dielectric properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liu, J.; Fan, W.; Lu, G.; Zhou, D.; Wang, Z.; Yan, J. Semi-Interpenetrating Polymer Networks Based on Cyanate Ester and Highly Soluble Thermoplastic Polyimide. Polymers 2019, 11, 862.

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