Tuning the physical properties of malleable and recyclable polyimine thermosets: the effect of solvent and monomer concentration

Author(s): Chengpu Zhu ¹ ^, ² ^, ³ ^, ⁴ , Cally Xi ¹ ^, ² ^, ³ ^, ⁴ , William Doro ¹ ^, ² ^, ³ ^, ⁴ , Tianyi Wang ¹ ^, ² ^, ³ ^, ⁴ , Xin Zhang ¹ ^, ² ^, ³ ^, ⁴ , Yinghua Jin ¹ ^, ² ^, ³ ^, ⁴ , Wei Zhang ¹ ^, ² ^, ³ ^, ⁴

Publication date (Electronic): 2017

Journal: RSC Adv.

Publisher: Royal Society of Chemistry (RSC)

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Abstract

We report the effect of solvent choice and polymerization rate on the physical properties of polyimine based malleable thermosets.

Abstract

The morphological, mechanical, and thermal properties of polyimine films were investigated under different reaction conditions. Polyimines with Young's modulus of 0.03–2.04 GPa could be obtained from the same monomer combinations. Our study shows that polyimine properties are determined by the combined effect of solvent choice and polymerization rate.

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A thermally re-mendable cross-linked polymeric material.

Xiangxu Chen, Matheus A Dam, Kanji Ono … (2002)

We have developed a transparent organic polymeric material that can repeatedly mend or "re-mend" itself under mild conditions. The material is a tough solid at room temperature and below with mechanical properties equaling those of commercial epoxy resins. At temperatures above 120 degrees C, approximately 30% (as determined by solid-state nuclear magnetic resonance spectroscopy) of "intermonomer" linkages disconnect but then reconnect upon cooling, This process is fully reversible and can be used to restore a fractured part of the polymer multiple times, and it does not require additional ingredients such as a catalyst, additional monomer, or special surface treatment of the fractured interface.

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Silica-like malleable materials from permanent organic networks.

Damien Montarnal, Mathieu Capelot, François Tournilhac … (2011)

Permanently cross-linked materials have outstanding mechanical properties and solvent resistance, but they cannot be processed and reshaped once synthesized. Non-cross-linked polymers and those with reversible cross-links are processable, but they are soluble. We designed epoxy networks that can rearrange their topology by exchange reactions without depolymerization and showed that they are insoluble and processable. Unlike organic compounds and polymers whose viscosity varies abruptly near the glass transition, these networks show Arrhenius-like gradual viscosity variations like those of vitreous silica. Like silica, the materials can be wrought and welded to make complex objects by local heating without the use of molds. The concept of a glass made by reversible topology freezing in epoxy networks can be readily scaled up for applications and generalized to other chemistries.

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Recent advances in dynamic covalent chemistry.

Yinghua Jin, Chao-Lan Yu, Ryan Denman … (2013)

Dynamic covalent chemistry (DCvC) has been strongly integrated into diverse research fields, and has enabled easy access to a variety of combinatorial libraries, 2-D macrocycles, and 3-D molecular cages that target many important applications, such as drug discovery, biotechnology, molecular separation, light harvesting, etc. DCvC relies on the reversible formation and breaking of rather strong covalent bonding within molecules. Therefore it combines the error-correction capability of supramolecular chemistry and the robustness of covalent bonding. Compared to those supramolecular interactions, dynamic covalent reactions usually have slower kinetics and require the assistance of catalysts to achieve rapid equilibrium. Although the scope of dynamic covalent reactions is rapidly expanding, the reversible reactions suitable for DCvC are still very limited. The identification and development of new dynamic reactions and catalysts would be critical for the further advancement of DCvC. This review covers the recent development of dynamic covalent reactions as well as their applications.

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Author and article information

Contributors

Wei Zhang: (View ORCID Profile)

Journal

Journal ID (publisher-id): RSCACL

Title: RSC Adv.

Abbreviated Title: RSC Adv.

Publisher: Royal Society of Chemistry (RSC)

ISSN (Electronic): 2046-2069

Publication date Created: 2017

Publication date (Electronic): 2017

Volume: 7

Issue: 76

Pages: 48303-48307

Affiliations

[1 ]Department of Chemistry and Biochemistry

[2 ]University of Colorado

[3 ]Boulder

[4 ]USA

Article

DOI: 10.1039/C7RA10956C

SO-VID: eecfb56d-16c3-410a-bc8b-96abd2f21bb8

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