Investigation on the thermal properties of new thermo-reversible networks based on poly(vinyl furfural) and multifunctional maleimide compounds

Găină, Constantin; Ursache, Oana; Gaina, Viorica; Buruiana, Emil C.; Ionita, Daniela

doi:10.3144/expresspolymlett.2012.14

Cited by 36 publications

(20 citation statements)

References 44 publications

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“…Our approach to removable polymer networks is the introduction of chemically labile linkages within cross-linked polymeric networks. We have explored the DA cycloaddition reactions between bismaleimide and furyl monomers or polymers [39][40][41][42]. The mechanical measurements showed a greater elongation at break for obtained polyurethane networks, elongation which can be even nine times higher than that of previously obtained polyurethane networks by Diels-Alder reaction [41].…”

Section: Introductionmentioning

confidence: 99%

Thermally reversible cross-linked poly(ether-urethane)s

Găină¹,

Ursache²,

Gaina³

et al. 2013

Express Polym. Lett.

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Abstract. Cross-linked poly(ether-urethane)s were prepared by Diels-Alder (DA) reaction of the furan-containing poly(ether-urethane) to bismaleimides and showed thermal reversibility evidenced by differential scanning calorimetry and attenuated total reflectance in conjunction with Fourier transform infrared spectroscopy (ATR-FTIR). The furan-containing poly(ether-urethane)s were synthesized by the polyaddition reaction of 1,6-hexamethylene diisocyanate (HMDI) or 4,4!-dibenzyl diisocyanate (DBDI) to poly(tetramethylene ether) glycol (PTMEG having M n = 250, 650, 1000, 1500 and 2000) and 2-[N,N-bis(2-methyl-2-hydroxyethyl)amino]furfuryl as chain extender by the solution prepolymer method. The molar ratio of isocyanate: PTMEG:chain extender varied from 2:1:1 to 4:1:3, which produces a molar concentration of furyl group ranging between 3.65·10 -4 and 1.25·10 -3 mol/g.

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Section: Introductionmentioning

confidence: 99%

Thermally reversible cross-linked poly(ether-urethane)s

Găină¹,

Ursache²,

Gaina³

et al. 2013

Express Polym. Lett.

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“…The healing liquid flows into the crack and restores the connection between the broken parts [2]. Selfrepair and damage assessment are of interest for concrete parts [3,4], polymers [5,6] and 3 related composites, as well [7][8][9][10]. Hollow fibers may also contain different "indicator" liquids, which can help us to detect the damage development.…”

Section: Introductionmentioning

confidence: 99%

Damage detection and self-repair in hollow glass fiber fabric-reinforced epoxy composites via fiber filling

Kling

Czigány

2014

Composites Science and Technology

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2Hollow glass fiber reinforced epoxy matrix composites were produced to study whether the damage development can be followed and the self-repair can triggered by filling the fibers with suitable additives. Composite plates were manufactured by the hand layup and vacuum assisted resin transfer molding techniques. To detect subcritical transverse impact damage, hollow fibers were filled with an ultraviolet fluorescent dye, whereas for selfrepair, they were filled with a polyester resin along with the corresponding accelerator. The healing process was induced at different temperatures and continued for different durations. It was demonstrated that the targeted damage detection and self-repair can be achieved using thin (10-13 µm outer diameter) reinforcing hollow fibers. The selfrepairing ability was demonstrated in three point bending tests and the healing was confirmed by inspection with scanning electron microscopy.

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“…A sharper decrease in E 0 and higher tan d peaks were observed for neat thermoplasticized biopolymers (TPS SG , TPZ, TPS MSG , and TPS UF ). Sharp decreases in E 0 are typical of amorphous polymers; gradual decreases in the same parameter are related with semicrystalline polymers, whereas the tan d peak height is usually related to the molecular mobility [12,21].…”

Section: Semmentioning

confidence: 99%

Strategies to Produce Thermoplastic Starch–Zein Blends: Effect on Compatibilization

et al. 2014

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Different strategies to produce thermoplastic materials using starch and zein were studied, aiming to investigate their effect on the compatibility of starch and zein. Research strategies comprised the use of two different plasticizers for starch, two different compatibilizing agents, and two blending procedures. The plasticizers were mixtures of sorbitol and glycerol (SG) or urea and formamide (UF). UF and maleated starch (MS) were used as compatibilizing agents. The blending procedures included: (1) thermoextruding starch and zein as premixed powder materials (TP [Mix]) and (2) coextruding the biopolymers previously thermoplasticized with suitable plasticizers. As observed by the tensile tests, scanning electronic microscopy, and dynamic mechanical analysis, segregation of phases occurred at different extents in all the starch-zein blends. Materials made with MS through the TP [Mix] procedure presented the most severe phases segregation, while the materials made with UF showed higher compatibility between starch and zein. Fourier Transform Infrared Spectroscopy (FTIR) suggests that increased zein content leads to a lower molecular order, which was ascribed to diminished molecular entanglement. Thermogravimetric analysis and FTIR analysis showed that the chemical interaction between starch and zein occurred more extensively in slabs made with UF than those made with MS. In addition, foamability was evaluated for the selected materials using supercritical CO 2 . Neat thermoplasticized starch plasticized with UF and themoplasticized zein with polyethylene-glycol 400 showed good suitability to be foamed, producing foams with porosities above 85 %. Starch plasticized with SG and starch-zein blends yielded compact structures with low porosity values after foaming. Keywords Starch Á Zein Á Compatibilization Á Thermoplastic extrusion Á Foaming Abbreviations UF Urea and formamide mixture at 2:1 (wt:wt) ratio SG Sorbitol and glycerol mixture at 1.4:1 (wt:wt) ratio MS Maleated starch MSG Mixture of native/maleated starch (50:50) and SG as plasticizer TPS UF Native starch thermoplasticized with UF TPS SG Native starch thermoplasticized with SG TPS MSG Thermoplasticized MSG TPZ Zein thermoplasticized with PEG400 Mix[TP] Mixing thermoplasticized biopolymers through thermoextrusion TP[Mix] Thermoplasticizing powder compositions of biopolymers and plasticizers

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Investigation on the thermal properties of new thermo-reversible networks based on poly(vinyl furfural) and multifunctional maleimide compounds

Cited by 36 publications

References 44 publications

Thermally reversible cross-linked poly(ether-urethane)s

Thermally reversible cross-linked poly(ether-urethane)s

Damage detection and self-repair in hollow glass fiber fabric-reinforced epoxy composites via fiber filling

Strategies to Produce Thermoplastic Starch–Zein Blends: Effect on Compatibilization

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