Temperature-modulated differential scanning calorimetric measurements on nascent ultra-high molecular mass polyethylene

G.W.H. Hoehne, L. Kurelec

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    Uittreksel

    Temperature-modulated differential scanning calorimetric (TMDSC) measurements on nascent ultra-high molecular mass polyethylene (UHMMPE) in scanning as well as quasi-isothermal mode are presented. From these measurements, a special irreversible relaxation process in the pre-melting region can be separated, which only occur on the first heating of the nascent material. The frequency dependence of this process yield a characteristic time constant of 6.5 s (or 24 mHz) which fits with the a2-process known from mechanical measurements. Quasi-isothermal measurements show that there are two slow (exponential) relaxation processes with time constants of 2–5 and several hundred minutes, respectively. The latter is only found in the first run of nascent UHMMPE and seems to be connected with irreversible structural changes (crystal thickening and ordering). The low activation energy (ca. 50 kJ mol-1) points to a chain diffusion process rather than melting and crystallization.
    Originele taal-2Engels
    Pagina's (van-tot)141-150
    TijdschriftThermochimica Acta
    Volume377
    Nummer van het tijdschrift1-2
    DOI's
    StatusGepubliceerd - 2001

    Vingerafdruk

    Molecular mass
    Polyethylene
    Polyethylenes
    polyethylenes
    Scanning
    time constant
    scanning
    Relaxation processes
    melting
    mechanical measurement
    Melting
    Temperature
    temperature
    Crystallization
    crystallization
    activation energy
    heating
    Activation energy
    Heating
    Crystals

    Citeer dit

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    title = "Temperature-modulated differential scanning calorimetric measurements on nascent ultra-high molecular mass polyethylene",
    abstract = "Temperature-modulated differential scanning calorimetric (TMDSC) measurements on nascent ultra-high molecular mass polyethylene (UHMMPE) in scanning as well as quasi-isothermal mode are presented. From these measurements, a special irreversible relaxation process in the pre-melting region can be separated, which only occur on the first heating of the nascent material. The frequency dependence of this process yield a characteristic time constant of 6.5 s (or 24 mHz) which fits with the a2-process known from mechanical measurements. Quasi-isothermal measurements show that there are two slow (exponential) relaxation processes with time constants of 2–5 and several hundred minutes, respectively. The latter is only found in the first run of nascent UHMMPE and seems to be connected with irreversible structural changes (crystal thickening and ordering). The low activation energy (ca. 50 kJ mol-1) points to a chain diffusion process rather than melting and crystallization.",
    author = "G.W.H. Hoehne and L. Kurelec",
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    doi = "10.1016/S0040-6031(01)00549-4",
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    pages = "141--150",
    journal = "Thermochimica Acta",
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    }

    Temperature-modulated differential scanning calorimetric measurements on nascent ultra-high molecular mass polyethylene. / Hoehne, G.W.H.; Kurelec, L.

    In: Thermochimica Acta, Vol. 377, Nr. 1-2, 2001, blz. 141-150.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    TY - JOUR

    T1 - Temperature-modulated differential scanning calorimetric measurements on nascent ultra-high molecular mass polyethylene

    AU - Hoehne, G.W.H.

    AU - Kurelec, L.

    PY - 2001

    Y1 - 2001

    N2 - Temperature-modulated differential scanning calorimetric (TMDSC) measurements on nascent ultra-high molecular mass polyethylene (UHMMPE) in scanning as well as quasi-isothermal mode are presented. From these measurements, a special irreversible relaxation process in the pre-melting region can be separated, which only occur on the first heating of the nascent material. The frequency dependence of this process yield a characteristic time constant of 6.5 s (or 24 mHz) which fits with the a2-process known from mechanical measurements. Quasi-isothermal measurements show that there are two slow (exponential) relaxation processes with time constants of 2–5 and several hundred minutes, respectively. The latter is only found in the first run of nascent UHMMPE and seems to be connected with irreversible structural changes (crystal thickening and ordering). The low activation energy (ca. 50 kJ mol-1) points to a chain diffusion process rather than melting and crystallization.

    AB - Temperature-modulated differential scanning calorimetric (TMDSC) measurements on nascent ultra-high molecular mass polyethylene (UHMMPE) in scanning as well as quasi-isothermal mode are presented. From these measurements, a special irreversible relaxation process in the pre-melting region can be separated, which only occur on the first heating of the nascent material. The frequency dependence of this process yield a characteristic time constant of 6.5 s (or 24 mHz) which fits with the a2-process known from mechanical measurements. Quasi-isothermal measurements show that there are two slow (exponential) relaxation processes with time constants of 2–5 and several hundred minutes, respectively. The latter is only found in the first run of nascent UHMMPE and seems to be connected with irreversible structural changes (crystal thickening and ordering). The low activation energy (ca. 50 kJ mol-1) points to a chain diffusion process rather than melting and crystallization.

    U2 - 10.1016/S0040-6031(01)00549-4

    DO - 10.1016/S0040-6031(01)00549-4

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    EP - 150

    JO - Thermochimica Acta

    JF - Thermochimica Acta

    SN - 0040-6031

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    ER -