Poly(trimethylene terephthalate) (PTT) is an excellent fiber material. Its thermal degradation and isothermal crystalline behaviors were in this study investigated using thermogravimetric analysis (TGA), thermog...Poly(trimethylene terephthalate) (PTT) is an excellent fiber material. Its thermal degradation and isothermal crystalline behaviors were in this study investigated using thermogravimetric analysis (TGA), thermogravimetric analysis-Fourier transform infrared spectroscopy (TGA-FTIR) analysis, differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The thermal degradation mechanism of PTT follows Mclafferty rearrangement principle. The PTTwithintrinsicviscosity(IV) of 0.74 dL/g has a maximum crystallinity of about 55% at 190 ℃, as demonstrated by DSC and XRD measurements consistently.展开更多
基金the China High-Tech Development 863 Program,Guangdong Province Sci & Tech Bureau(No.2006B12401006)Guangzhou Sci & Tech Bureau(No.2005U13D2031,2007Z2-D2031)financial support of this work National University of Singapore for financial support.
文摘Novel Cu-Ni/C has been prepared and utilized as an efficient catalyst system in direct synthesis of DMC from CH3OH and CO2.
基金the China High-Tech Development 863 Program(No.2007AA03Z217)Guangdong Province Sci,& Tech.Bureau(No.2006B 12401006,06300332,2007A090302040)+1 种基金Guangzhou Sci.& Tech.Bureau(No.2005U13D2031,2007Z2-D2031)Foshan Sci.& Tech.Bureau for financial support of this work.
文摘Poly(trimethylene terephthalate) (PTT) is an excellent fiber material. Its thermal degradation and isothermal crystalline behaviors were in this study investigated using thermogravimetric analysis (TGA), thermogravimetric analysis-Fourier transform infrared spectroscopy (TGA-FTIR) analysis, differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The thermal degradation mechanism of PTT follows Mclafferty rearrangement principle. The PTTwithintrinsicviscosity(IV) of 0.74 dL/g has a maximum crystallinity of about 55% at 190 ℃, as demonstrated by DSC and XRD measurements consistently.