Multiple melting endotherms from ethylene terephthalate—caprolactone copolyesters

Zhang, Ruiyun; Luο, Xingguang; Ma, Dapeng

doi:10.1016/0032-3861(95)92237-9

Cited by 35 publications

(65 citation statements)

References 12 publications

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“…[43] In our case, the band intensification is readily observable for PEO contents between 20 and 40 wt.-% (Figure 7), where the polyether component is completely amorphous and the blend is in a completely miscible state. [18] Considering that the strength of the b blend signals shown in Figure 7 for PEO-rich blends should be corrected to account for the actual content of ER in the blend, it appears that polyether addition eventually facilitates local motion of hydroxyl units in the epoxy.…”

Section: Resultsmentioning

confidence: 99%

“…[18][19][20][21][22] The T g -composition relationship observed in our blends (Table 1 and Figure 3) has been described in the left half of the diagram by an empirical equation of Kwei [35] T blend…”

Section: Thermal Properties Of Cured Er þ Peo Blendsmentioning

confidence: 99%

“…Zheng et al report that DDM-cured blends show b ERrelated signals in the range À100 to 0 8C, with loss factor (tan d ¼ e 00 /e 0 ) peaks around À59 and À80 8C, for pure ER and 50/50 ER þ PEO, respectively (measured at f ¼ 0.1 Hz). [18] Based on our results involving the same compositions, the TSC signal shows a clear upshift, irrespective of the blocking-electrode system (e.g., from À107 to À99 8C using FEP films). According to Zheng et al, a high-T shift of the DMA b ER signal was observed only in the blend with 10 wt.-% PEO.…”

Section: Dielectric Characterization Of Cured Er þ Peo Blendsmentioning

confidence: 99%

“…According to Zheng et al, a high-T shift of the DMA b ER signal was observed only in the blend with 10 wt.-% PEO. [18] They explained this by association of hydroxyl-ether units in the epoxy with oxygen atoms in PEO, hindering the rotational motion of the hydroxyl ether groups. Further, Zheng and co-workers suggested that increasing concentration of the linear polymer component should create, and progressively make dominant, plasticizing of the b ER mode in the epoxy.…”

Section: Dielectric Characterization Of Cured Er þ Peo Blendsmentioning

confidence: 99%

See 3 more Smart Citations

Thermophysical Properties and Molecular Relaxations in Cured Epoxy Resin + PEO Blends: Observations on Factors Controlling Miscibility

Kalogeras

Vassilikou‐Dova

Christakis

et al. 2006

Macro Chemistry & Physics

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Summary: Thermophysical properties and molecular relaxations in aromatic amine‐cured diglycidyl ether of bisphenol‐A (DGEBA) epoxy oligomer and poly(ethylene oxide) (PEO) mixtures were determined by DSC and dielectric techniques (TSC, DRS). The binary blends were judged to be fully miscible in the amorphous state (wPEO < 40 wt.‐%), as evidenced by the single composition‐dependent glass transition temperatures Tgs. In the amorphous blends, negative deviations of dielectric/thermal Tg‐estimates from the linear mixing rule or the behavior predicted by the Fox equation reveal weaker intermolecular interactions, compared to strong self‐association of hydroxyls in the cured thermoset. Morphological changes in PEO‐rich blends (wPEO ≥ 40 wt.‐%) are in accordance with their complicated interface structure, previously reported to consist of amorphous PEO regions, branched epoxy resin chains and an imperfect epoxy resin network located between PEO lamellae. In these blends, PEO crystallites exert steric hindrances in the amorphous regions, causing strong Tg upshifts. Changes in the relaxation dynamics of glyceryl segments (e.g., in the activation energy barrier and relaxation strength) are in accordance with the idea that the close matching between the molecular polarities of PEO, epoxy resin and the cure agent significantly contributes to the observed miscibility.

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Section: Resultsmentioning

confidence: 99%

Section: Thermal Properties Of Cured Er þ Peo Blendsmentioning

confidence: 99%

Section: Dielectric Characterization Of Cured Er þ Peo Blendsmentioning

confidence: 99%

Section: Dielectric Characterization Of Cured Er þ Peo Blendsmentioning

confidence: 99%

See 2 more Smart Citations

Thermophysical Properties and Molecular Relaxations in Cured Epoxy Resin + PEO Blends: Observations on Factors Controlling Miscibility

Kalogeras

Vassilikou‐Dova

Christakis

et al. 2006

Macro Chemistry & Physics

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show abstract

“…In order to avoid phase separation, the stabilizing ligands must be extremely soluble during the whole conversion range. Poly(ethylene oxide) (PEO) exhibits this behavior, particularly with typical epoxies based on diglycidylether of bisphenol A (DGEBA) [36][37][38][39]. Therefore, Au NPs stabilized with PEO chains were synthesized and dispersed in the epoxy monomers.…”

Section: Introductionmentioning

confidence: 98%

Remote activation by green-light irradiation of shape memory epoxies containing gold nanoparticles

Leonardi

Puig

Antonacci

et al. 2015

European Polymer Journal

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Crystallization behavior and spherulite morphology of soft and hard segments in ethylene terephthalate-?-caprolactone copolyesters

Zhang

Luo

et al. 1999

J. Polym. Sci. B Polym. Phys.

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Multiple melting endotherms from ethylene terephthalate—caprolactone copolyesters

Cited by 35 publications

References 12 publications

Thermophysical Properties and Molecular Relaxations in Cured Epoxy Resin + PEO Blends: Observations on Factors Controlling Miscibility

Thermophysical Properties and Molecular Relaxations in Cured Epoxy Resin + PEO Blends: Observations on Factors Controlling Miscibility

Remote activation by green-light irradiation of shape memory epoxies containing gold nanoparticles

Crystallization behavior and spherulite morphology of soft and hard segments in ethylene terephthalate-?-caprolactone copolyesters

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