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Wyszukujesz frazę "thermal degradation" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Study of thermal degradation behavior and kinetics of ABS/PC blend
    Autorzy:
    Bano, Saira
    Ramzan, Naveed
    Iqbal, Tanveer
    Mahmood, Hamayoun
    Saeed, Farhan
    Powiązania:
    https://bibliotekanauki.pl/articles/778844.pdf
    Data publikacji:
    2020
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    ABS/PC blend
    thermal degradation
    iso-conversional analysis
    activation energy
    thermodynamic parameters
    Opis:
    This work investigated kinetics and thermal degradation of acrylonitrile butadiene styrene and polycarbonate (ABS/PC) blend using thermogravimetric analysis in the range of 25 to 520°C. For thermal degradation of blend, activation energy (Ea) and pre-exponential factor (A) were calculated under various heating rates as 5, 10, 15 and 20°C/min using iso-conversional model-free methods (Kissinger, Flynn-Wall- Ozawa and Friedman). Mass loss of the blend as a function of temperature was plotted as thermogravimetric curve (TG) while derivative values of mass loss were drawn as derivative thermogravimetric (DTG) curve. Using Kissinger method, Ea was 51.4 kJ/mol, while values calculated from FWO and Friedman method were 86–161 and 30–251 kJ/mol respectively. Results showed increasing trend of Ea with higher conversion values indicating different degradation mechanisms at the initial and final stages of the experiment. Thermodynamic parameters such as enthalpy change (ΔH), Gibbs free energy (ΔG) and entropy change (ΔS) were also calculated.
    Źródło:
    Polish Journal of Chemical Technology; 2020, 22, 3; 64-69
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of demineralization on the physiochemical structure and thermal degradation of acid treated indigenous rice husk
    Autorzy:
    Aslam, U.
    Ramzan, N.
    Iqbal, T.
    Kazmi, M.
    Ikhlaq, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/779611.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    demineralization
    leaching agent
    physiochemical structure
    alkali and alkaline earth metals
    thermal degradation
    Opis:
    Energy generation from biomass presents some serious problems like slagging, fouling and corrosion of boilers. To address these problems, demineralization of biomass is performed using different leaching agents. This study is focused on determining the influence of leaching agents and leaching time on the physiochemical structure of rice husk during demineralization. Dilute (5% wt) solutions of HCl and H2SO4 were used for the demineralization of rice husk separately with leaching time of 15, 60 and 120 minutes. It is shown that H2SO4 exhibited higher removal of alkali and alkaline earth metals (AAEM) comparatively as depicted by the 34.2% decrease in ash content along with an increase of 7.10% in the heating value. The acid has been seen to induce more notable changes in physiochemical structure as depicted by the FTIR spectra and SEM micrographs. The thermal degradation behavior of the demineralized rice husk has also been reported.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 3; 117-121
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal degradation of poly(alkyl methacrylates) and polyurethane pressure-sensitive adhesives
    Autorzy:
    Zych, K.
    Pełech, R.
    Czech, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/778075.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    chromatografia
    poli(akrylany alkilowe
    poliuretany
    rozpuszczalnik polimeryzacji
    degradacja termiczna
    piroliza
    chromatography
    poly(alkyl acrylates)
    polyurethanes
    solvent polymerization
    thermal degradation
    pyrolysis
    Opis:
    Gas chromatography, coupled with the temperature controlled pyrolysis technique, can be used as a quick method of identification of polymers such as acrylates, methacrylates and polyurethanes. Polymers based on alkyl methacrylates are widely used as construction materials and coatings. Polyurethanes are widely used as self-adhesives, sealants and electrical products (due to polyurethane's low glass transition temperature Tg). The aim of this work is to investigate which products can be obtained from polymethacrylates and polyurethanes.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 4; 40-43
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal decomposition of acrylic pressure-sensitive adhesives
    Autorzy:
    Czech, Z.
    Pełech, R.
    Zych, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/778846.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    kopolimery akrylowe
    kopolimery metakrylowe
    kleje samoprzylepne
    piroliza
    degradacja termiczna
    acrylic and methacrylic copolymers
    pressure-sensitive adhesives
    pyrolysis
    thermal degradation products
    analysis and identification
    Opis:
    The general aim of this article is to review the state of knowledge on pressure-sensitive adhesives (PSAs) and pyrolysis. Recent research data in the field of pyrolysis gas- chromatography (Py-GC) analysis of acrylic PSAs are presented. First, PSA characteristics and applications, pyrolysis (including Py-GC) as an analytical method, and system solutions, are described. The latest scientific achievements in the analysis of thermal degradation products of acrylic PSAs are then presented.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 4; 7-12
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal and thermo-catalytic degradation of polyolefins as a simple and efficient method of landfill clearing
    Autorzy:
    Tomaszewska, K.
    Kałużna-Czaplińska, J.
    Jóźwiak, W. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/779208.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    polietylen
    polipropylen
    poliolefin
    komunalne odpady z tworzyw sztucznych
    degradacja termiczna
    degradacja termokatalityczna
    składniki płynnego paliwa
    kinetyka
    polyethylene
    polypropylene
    polyolefins
    municipal waste plastics
    thermal degradation
    thermocatalytic degration
    liquid fuels component
    kinetics
    Opis:
    Thermal degradation of the low density polyethylene (LDPE), polypropylene (PP) and the municipal waste plastics was investigated. The thermo-catalytic degradation of LDPE and PP was studied in the presence of the following catalysts: four different types of montmorillonite: K5, K10, K20, K30 and – for comparison – zeolites (natural – clinoptilolite, Y Na+ and YH+). Thermal analyses TG-DTA-MS of polymers and polymercatalyst mixtures were carried out in an argon flow atmosphere in isothermal and dynamic conditions. The following order was found: in lowering the reaction temperature for LDPE degradation YH+> mK5 > mK20 = mK30 >mK10 > NZ > YNa+; for PP degradation: mK20 > mK5 = mK30 >mK10 > YH+> NZ >YNa+. The activity tests were carried out in a stainless steel batch reactor under atmospheric pressure in a wide temperature range of up to 410°C, and using the atmosphere of argon flow. The liquid products were analysed by the GC-MS method. The hydrocarbons in the liquid products from thermal degradation of polymers were broadly distributed in the carbon fractions of C8 to C26 – for LDPE and C6 to C31for PP.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 3; 50-57
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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