Step-scan alternating DSC study of melting and crystallisation in poly(ethylene oxide)

Pielichowski, Krzysztof; Flejtuch, Kinga; Pielichowski, Jan

doi:10.1016/j.polymer.2003.12.045

Cited by 44 publications

(12 citation statements)

References 38 publications

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“…No glass transition was observed in the thermograms of PEO (Fig. 1, b and c), but only an endotherm corresponding to melting of the crystalline polymer which is in agreement with the high degree of crystallinity of this polymer [11]. The characteristics for the melting of PEO with different molecular masses into the individual state, in triblock-copolymers and in mixtures are summarized in Table 2.…”

supporting

confidence: 76%

“…According to the results of this work the basic contributions to the overall carbonyl absorption in the initial PAA are made by the amide 1 absorptions of the amide groups in the structures of the cis-trans multimers (n » 1660 cm -1 ) and 385 Notes. T g -glass temperature; DT g and DT m -temperature intervals of the corresponding transition temperatures; DC p -break in the heat capacity; T m -melting point; DH m -enthalpy of melting; X c -degree of crystallinity, X c = DH m /∆H m 0 , where ∆H m 0 is the enthalpy of melting of a 100% crystalline polymer (196.8 J/g) [11].…”

mentioning

confidence: 99%

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Structure of triblock-copolymers based on poly(ethylene oxide) and poly(acrylamide) with central blocks of varying lengths

et al. 2005

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Temperature transitions have been studied in the structure of triblock copolymers based on poly(ethylene oxide) and poly(acrylamide) (PAA-b-PEO-b-PAA) with central blocks of varying length and compared with individual polymers and polymer mixtures with analogous composition. It has been established that interaction of the polymer components on account of the formation of systems of intramolecular hydrogen bonds is strengthened by the presence of covalent bonds between the components.

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supporting

confidence: 76%

mentioning

confidence: 99%

Structure of triblock-copolymers based on poly(ethylene oxide) and poly(acrylamide) with central blocks of varying lengths

et al. 2005

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“…[25][26][27] In the following, two curves are presented for each step scan. To obtain complete separation between the glass and polymorphic transitions, 20-24 step-scan DSC experiments were performed.…”

Section: Methodsmentioning

confidence: 99%

“…This method is classically used to isolate phase transitions (detected during the plateau) from the glass transition (detected during the temperature steps). [25][26][27] In the following, two curves are presented for each step scan. The heat flow curve was representative of the glass-transition phenomena, whereas the specific heat curve was representative of the total heat flow.…”

Section: Methodsmentioning

confidence: 99%

Superplastic behavior of rosin/beeswax blends at room temperature

Gaillard¹,

Girard²,

Monge³

et al. 2012

J of Applied Polymer Sci

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International audienceBlends of rosin and beeswax were studied in terms of their thermal and mechanical behaviors. Their glass transition and α relaxation were both characterized, either by differential scanning calorimetry or by dynamic mechanical thermal analysis. In this study, we focused particularly on the impact of the microstructure on the mechanical properties, as studied by compression, shear, and nanoindentation tests. It is shown that at room temperature, these blends exhibited a viscous behavior in both the elastic and plastic regimes. From these measurements, a superplastic behavior was highlighted for blends with more than 60 wt % rosin. This superplastic behavior constitutes a real new potential in the mechanical reliability of adhesives based on rosin, which are more generally known for their very brittle behavior. As a result, it should open the way for the design of new shapes

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“…It is a promising PCM for solar LHTES applications because of its relatively high latent heat of fusion, congruent melting and crystallization behavior, suitable melting temperature range, noncorrosiveness, nontoxicity, and high decomposition temperature range 13–16. Its phase behavior should be considered in terms of both the conformation of individual molecules in the crystalline state and the arrangement of those molecules into microscopic and macroscopic structures 17. Poly(methyl methacrylate) (PMMA) is a commercially available acrylic resin that is fully polymerized methyl methacrylate.…”

Section: Introductionmentioning

confidence: 99%

Poly(ethylene glycol)/poly(methyl methacrylate) blends as novel form‐stable phase‐change materials for thermal energy storage

Sarı

Alkan

Karaipekli

et al. 2009

J of Applied Polymer Sci

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In this study, we focused on the preparation and characterization of poly(ethylene glycol) (PEG)/poly(methyl methacrylate) (PMMA) blends as novel form-stable phase-change materials (PCMs) for latent-heat thermal energy storage (LHTES) applications. In the blends, PEG acted as a PCM when PMMA was operated as supporting material. We subjected the prepared blends at different mass fractions of PEG (50, 60, 70, 80, and 90% w/w) to leakage tests by heating the blends over the melting temperature of the PCM to determine the maximum encapsulation ratio without leakage. The prepared 70/30 w/w % PEG/PMMA blend as a form-stable PCM was characterized with optical microscopy and Fourier transform infrared spectroscopy. The thermal properties of the form-stable PCM were meas-ured with differential scanning calorimetry (DSC). DSC analysis indicated that the form-stable PEG/PMMA blend melted at 58.07 C and crystallized at 39.28 C and that it had latent heats of 121.24 and 108.36 J/g for melting and crystallization, respectively. These thermal properties give the PCMs potential LHTES purposes, such as for solar space heating and ventilating applications in buildings. Accelerated thermal cycling tests also showed that the form-stable PEG/PMMA blend as PCMs had good thermal reliability and chemical stability. V C 2009 Wiley Periodicals, Inc. J Appl Polym Sci 116: 929-933, 2010

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Step-scan alternating DSC study of melting and crystallisation in poly(ethylene oxide)

Cited by 44 publications

References 38 publications

Structure of triblock-copolymers based on poly(ethylene oxide) and poly(acrylamide) with central blocks of varying lengths

Structure of triblock-copolymers based on poly(ethylene oxide) and poly(acrylamide) with central blocks of varying lengths

Superplastic behavior of rosin/beeswax blends at room temperature

Poly(ethylene glycol)/poly(methyl methacrylate) blends as novel form‐stable phase‐change materials for thermal energy storage

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