Glass transition in the lower homologues of polyethyleneoxide

Privalko, V. P.; Lobodina, Alla P.

doi:10.1016/0014-3057(74)90066-4

Cited by 24 publications

(19 citation statements)

References 22 publications

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“…We attribute the above phenomenon to the large inherent flexibility of glycole segments in PU chains. This is consistent with conclusions drawn from the analysis of Tg in poly(ethylene oxide) (25). However, substituting the experimental values of A C~ and Tg and calculated values of cohesion energy at Tg, /Tq (tab.…”

Section: B) Transition Glass-liquidsupporting

confidence: 87%

Thermodynamics and kinetics of phase transitions in linear polyurethanes from hexa(methylene diisocyanate) and low molecular weight glycoles

Lipatov¹,

Privalko²,

Kercha³

et al. 1976

Colloid Polymer Sci

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Section: B) Transition Glass-liquidsupporting

confidence: 87%

Thermodynamics and kinetics of phase transitions in linear polyurethanes from hexa(methylene diisocyanate) and low molecular weight glycoles

Lipatov¹,

Privalko²,

Kercha³

et al. 1976

Colloid Polymer Sci

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“…The results of fitting of the indentation curves allowed the calculation of the Young's modulus by Equation (8). Note that glass transition temperature, T g , of PEOs (linear and cross‐linked) is reported at about −40 °C and below,14, 25, 26 and therefore the samples measured at room temperature are in the rubbery plateau region. Figure 5 shows the dependence of the Young's modulus on the discharge power for three series of the films.…”

Section: Resultsmentioning

confidence: 99%

Does Cross‐Link Density of PEO‐Like Plasma Polymers Influence their Resistance to Adsorption of Fibrinogen?

Choukourov

Gordeev

Arzhakov

et al. 2011

Plasma Processes & Polymers

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Thin films of PEO‐like plasma polymers with different extent of cross‐linking were deposited by plasma‐assisted vacuum thermal depolymerization of PEO. The films underwent considerable volume changes when in contact with water, i.e., they behaved as hydrogels. A Flory–Rehner theory of gels corrected for non‐Gaussian chain distribution was applied to derive the average molar mass between cross‐links. Films with up to ten monomeric units between cross‐links were fabricated, this number decreasing to one at enhanced rf power. Such changes of structure resulted in a three‐orders‐of‐magnitude increase of Young's modulus. Even highly cross‐linked films did not adsorb fibrinogen unless the concentration of the ether groups dropped below 65%.

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“…In complete agreement with our expectations, one observes regular decrease of both Tm and A/-/m as L becomes smaller. Least squares analysis of the latter data according to equations (1) and (2) As suggested by a similar trend found for ohgomenc ethylene oxides [17], increase of A Cp, q accompanying more than two-fold chain length increase for EA-4 as compared to EA-2, may be the result of a reduced contribution of strong intermolecular hydrogen bonds involving end hydroxyl groups of the chain. Plots of Tin, experimental AH,~ ~ and corresponding X for annealed samples, as well as Tg for quenched samples, against Wfor EA-4 are quite similar to those for EA-2 in spite of different molecular weights (see fig.…”

Section: Eamentioning

confidence: 70%

Chain length effect on the crystal thermal stability of oligoesters crystallized in thin layers

Privalko¹,

Lipatov²,

Nedrya³

et al. 1984

Colloid & Polymer Sci

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Specific heat of two fractions of oligomeric ethylene adipates (EA-2 with molecular weight <34,> = 1700 and EA-4 = 4000) containing up to 85 weight parts of untreated Aerosit-I75, was measured in the temperature range 150-400 K. Detailed analysis of experimental data in terms of equations (I) and (2) led to the conclusion that significantly higher rate of decrease of both crystalline melting point as well as "true" (i. e., corrected for crystallinity) enthalpy of fusion with inverse value of distance between filler particles for EA-2 reflects higher affinity of end hydroxyl groups of oligomer chains in extended conformation towards polar Aerosil surface, as compared to that for middle-chain segments of EA-4 molecules which presumably are in a coiled conformation in the melt, and fold back on themselves on crystallization. On the other hand, sudden drop of experimental heats of fusion and crystallinities for both oligomers at filler contents above 50 weight parts is attributed to drastic jump of nucleation barrier for crystallization due to severe loss of conformational entropy of oligomer chains which either form "ties" between filler particles, with end groups anchored on the latter (as in the case of EA-2), or are squeezed in coiled conformation, with middle-chain segments on the periphery of coils interacting with neighboring filler particles (EA-4).

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Glass transition in the lower homologues of polyethyleneoxide

Cited by 24 publications

References 22 publications

Thermodynamics and kinetics of phase transitions in linear polyurethanes from hexa(methylene diisocyanate) and low molecular weight glycoles

Thermodynamics and kinetics of phase transitions in linear polyurethanes from hexa(methylene diisocyanate) and low molecular weight glycoles

Does Cross‐Link Density of PEO‐Like Plasma Polymers Influence their Resistance to Adsorption of Fibrinogen?

Chain length effect on the crystal thermal stability of oligoesters crystallized in thin layers

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