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Volume relaxation in amorphous and semicrystalline PET

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F07%3A63505437" target="_blank" >RIV/70883521:28110/07:63505437 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Volume relaxation in amorphous and semicrystalline PET

  • Original language description

    Two types of polyethyleneterephthalate (PET) were investigated, one nearly amorphous and the other highly crystallized. DSC analysis and mercury- in-glass dilatometry were used to determine the effect of crystalline phase content on the thermal behaviorof amorphous phase. Increasing portion of crystals caused an increase in glass transition temperature (Tg) and broadening of the transition zone. Thermal expansion coefficient and specific heat decreased. The amount of rigid amorphous fraction, RAF, wascalculated to be around 21-26%. Volume relaxation measurements initiated by temperature down-jump from the equilibrium above Tg to several temperatures in the vicinity of Tg showed considerably reduced relaxation rate for semicrystalline PET.

  • Czech name

    Objemová relaxace u mamorfní a semikrystalické PET

  • Czech description

    Dva druhy PET byly zkoumány pomocí DSC a dilatometrie. Byl určen podíl krystalické fáze a její vliv na fázi amorfní. Dochází k zvýšení Tg a rozšíření Tg zóny. RAF byla odhadnuta na 21-26%. Objemová relaxace je výrazně snížena přítomností krystalické struktury.

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    CD - Macromolecular chemistry

  • OECD FORD branch

Result continuities

  • Project

  • Continuities

    Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2007

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of Material Science

  • ISSN

    0022-2461

  • e-ISSN

  • Volume of the periodical

  • Issue of the periodical within the volume

    42

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    8

  • Pages from-to

    3724-3731

  • UT code for WoS article

  • EID of the result in the Scopus database