Studies on Diels–Alder thermoresponsive networks based on ether–urethane bismaleimide functionalized poly(vinyl alcohol)

Ursache, Oana; Găină, Constantin; Gaina, Viorica; Tudorachi, Niță; Bargan, Alexandra; Varganici, Cristian–Dragos; Roşu, Dan

doi:10.1007/s10973-014-4041-7

Cited by 15 publications

(12 citation statements)

References 54 publications

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“…However, with the increasing content of PMI-HSi, the initial reaction temperature and the exothermic peak temperature decrease in somewhat degree, indicating that the PMI-HSi/BD prepolymers have faster curing activity at lower temperature than BD resin. It is known that the curing reactions of BD resin contain the ''Ene addition'' and ''Diels-Alder'' reactions [20] between maleimide group of BDM and allyl group of DBA as well as the…”

Section: Curing Behavior and Crosslinked Structure Of Pmi-hsi/bd Resinsmentioning

confidence: 99%

Unique liquid multi-maleimide terminated branched polysiloxane and its flame retarding bismaleimide resin with outstanding thermal and mechanical properties

Jiang

Yuan

Liang

et al. 2015

Polymer Degradation and Stability

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Section: Curing Behavior and Crosslinked Structure Of Pmi-hsi/bd Resinsmentioning

confidence: 99%

Unique liquid multi-maleimide terminated branched polysiloxane and its flame retarding bismaleimide resin with outstanding thermal and mechanical properties

Jiang

Yuan

Liang

et al. 2015

Polymer Degradation and Stability

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“…Mainly, crack propagation in DA crosslinked polymers is more likely to take place at the DA linkages because DA covalent bonds (given their shear sensitive character) are weaker than regular covalent bonds [16]. After grinding, thermal mending procedures provide the energy to activate the functional moieties and the process of reshaping and reconnection of linkages [17,18,19]. As a next step, thermal annealing is commonly performed to improve the structural properties of the material [20,21].…”

Section: Introductionmentioning

confidence: 99%

Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry

et al. 2018

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This study examines the preparation of electrically conductive polymer networks based on furan-functionalised polyketone (PK-Fu) doped with multi-walled carbon nanotubes (MWCNTs) and reversibly crosslinked with bis-maleimide (B-Ma) via Diels-Alder (DA) cycloaddition. Notably, the incorporation of 5 wt.% of MWCNTs results in an increased modulus of the material, and makes it thermally and electrically conductive. Analysis by X-ray photoelectron spectroscopy indicates that MWCNTs, due to their diene/dienophile character, covalently interact with the matrix via DA reaction, leading to effective interfacial adhesion between the components. Raman spectroscopy points to a more effective graphitic ordering of MWCNTs after reaction with PK-Fu and B-Ma. After crosslinking the obtained composite via the DA reaction, the softening point (tan(δ) in dynamic mechanical analysis measurements) increases up to 155 °C, as compared to the value of 130 °C for the PK-Fu crosslinked with B-Ma and that of 140 °C for the PK-Fu/B-Ma/MWCNT nanocomposite before resistive heating (responsible for crosslinking). After grinding the composite, compression moulding (150 °C/40 bar) activates the retro-DA process that disrupts the network, allowing it to be reshaped as a thermoplastic. A subsequent process of annealing via resistive heating demonstrates the possibility of reconnecting the decoupled DA linkages, thus providing the PK networks with the same thermal, mechanical, and electrical properties as the crosslinked pristine systems.

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“…As with the signal maxima, no clear trend exists across the series, suggesting further that the polymer T g is not significantly affecting the thermochemistry of the rDA reaction, and that the different decrosslinking temperatures observed by DMA are arising from network effects rather than different rDA onsets. While a few similar DSC treatments of DA networks exist, enthalpies naturally vary widely due to differences in polymer morphologies, density of DA functionalities, and DA electronics.…”

Section: Resultsmentioning

confidence: 99%

Glass‐transition temperature governs the thermal decrosslinking behavior of Diels–Alder crosslinked polymethacrylate networks

Dobbins

Scheutz

Sun

et al. 2019

Journal of Polymer Science

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A series of Diels–Alder (DA) crosslinked polymethacrylate networks covering a broad range of glass‐transition temperatures (Tg) was prepared to establish the relationship between the Tg and the thermal decrosslinking behavior of these networks. A series of permanently crosslinked and uncrosslinked analogues were also prepared to better understand the thermoset‐to‐thermoplastic transition occurring in the DA networks at elevated temperatures. The network series were studied using dynamic mechanical analysis, which established an inverse relationship between Tg and decrosslinking ability. Differential scanning calorimetry confirmed the viability of the DA linkages in all formulations, and a trapping experiment with 9‐anthracenemethanol demonstrated that even the least responsive network was capable of undergoing decrosslinking given appropriate thermal treatment. While polymer chain mobility has long been understood to be a critical factor in healable materials, this work verifies the importance of this parameter in the decrosslinking of DA networks. © 2019 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 193–203

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Studies on Diels–Alder thermoresponsive networks based on ether–urethane bismaleimide functionalized poly(vinyl alcohol)

Cited by 15 publications

References 54 publications

Unique liquid multi-maleimide terminated branched polysiloxane and its flame retarding bismaleimide resin with outstanding thermal and mechanical properties

Unique liquid multi-maleimide terminated branched polysiloxane and its flame retarding bismaleimide resin with outstanding thermal and mechanical properties

Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry

Glass‐transition temperature governs the thermal decrosslinking behavior of Diels–Alder crosslinked polymethacrylate networks

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