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热分析在聚烯烃中的近期应用发展概况
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Modern thermal analysis techniques have been used extensively in the area of polyolefin characterization. Historically, differential scanning calorimetry (DSC) has been used to measure melting points, heats of fusion and crystallization, oxidative induction time and glass transition temperature, whereas thermogravimetric analysis (TGA) has been employed in the determination of decomposition temperatures and rates, as well as thermal stability kinetic studies. Recent developments involve the use of a sinusoidal heating rate to extract additional information from the classical thermal analysis experiments. In 1992, Modulated DSC® (MDSC®  was introduced. This technique employs the use of a sinusoidal heating rate and then deconvolutes the resulting heat flow signal to generate heat capacity, as well as additional heat flow signals. MDSC has been used extensively in the area of materials characterization, particularly in the fields of polymer science, food science, and inorganic materials.More recently, the sinusoidal heating rate has been applied to the field of TGA studies3. Modulated TGA (MTGA) uses the same heating rate principle as MDSC, and deconvolutes the resultant weight loss signal to generate kinetic information about decomposition reactions. This technique is similar to the classical factor jump TGA decomposition kinetics and generates kinetic constants which are in good agreement with standard multiple heating rate techniques. In this paper, both MDSC and MTGA theory are discussed, as well as applications of both techniques to studies of linear polyethylene (HDPE). MDSC is used to measure relative sample morphology in a series of polyethylene materials, and the data are correlated to tensile breaking tests, and MTGA is used to generate kinetic constants for a polyethylene thermal decomposition. |
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2017-02-17 10:10:43, 500.45 K
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