Počet záznamů: 1

Termička stabilnost segmentiranih poliuretanskih elastomera ojačanih česticama gline

  1. 1.
    0342403 - UMCH-V 2011 RIV CS ser J - Článek v odborném periodiku
    Pavličevic, J. - Budinski-Simendic, J. - Szecsenyi, K. M. - Lazić, N. - Špírková, Milena - Strachota, Adam
    Termička stabilnost segmentiranih poliuretanskih elastomera ojačanih česticama gline.
    [Thermal stability of segmented polyurethane elastomers reinforced by clay particles.]
    Hemijska industrija. Roč. 63, č. 6 (2009), s. 621-628 ISSN 0367-598X
    Výzkumný záměr: CEZ:AV0Z40500505
    Klíčová slova: segmented polyurethanes * thermal stability * elastomers
    Kód oboru RIV: CD - Makromolekulární chemie
    Impakt faktor: 0.117, rok: 2009

    Cilj je bio ispitivanje uticaja nanočestica gline na toplotna svojstva segmentiranih poliuretana dobijenih reakcijom polikarbonatnog diola, heksametilen-diizocijanata i produživača lanca 1,4-butandiola. Organski modifikovane čestice montmorilonita i bentonita su korišćene kao punioci za ojačanje elastomera. Struktura dobijenih materijala je varirana ili promenom sadržaja produživača lanaca ili tipom polikarbonatnog diola. Odnos OH grupa iz diolne komponente i OH grupa iz produživača lanca (R) bio je 1 ili 10. Toplotna svojstva materijala su određena korišćenjem modulovane diferencijalne skenirajuće kalorimetrije (MDSC). Termička degradacija je praćena simultanom diferencijalnom skenirajućom kalorimetrijom i termogravimetrijom koja istovremeno prati i promenu protoka toplote i gubitka mase.Temperatura prelaska u staklasto stanje,Tg,mekih segmenata elastomera iznosila je oko –33°C.Na osnovu termogravimetrijskih rezultata, ustanovljeno je da su dobijeni materijali veoma stabilni do 300°C.

    The aim of this work was to determine the influence of clay nanopartides on thermal properties of segmented polyurethanes based on hexamethylene-diisocyanate, aliphatic polycarbonate diol and 1,4-butanediol as chain extender. The organically modified particles of montmorillonite and bentonite were used as reinforcing fillers. The structure of elastomeric materials was varied either by diol type or chain extender content. The ratio of OH groups from diol and chain extender (R) was either 1 or 10. Thermal properties of prepared materials were determined using modulated differential scanning calorimetry (MDSC). Thermal stability of obtained elastomers has been studied by simultaneously thermogravimetry coupled with DSC. The glass transition temperature, Tg, of soft segments for all investigated samples was about 33 degrees C. On the basis of DTG results, it was concluded that obtained materials were very stable up to 300 degrees C.
    Trvalý link: http://hdl.handle.net/11104/0185145