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Abstract  

TG studies are given for PMMA prepared by radical polymerization, PTHF prepared by cationic polymerization, and their blends. A procedure is proposed for determining the activation energy, frequency factor, and the order of events corresponding to the respective stages of the multistage TG curves. The order of the initial event of PMMA is not the 1st. It is shown for this discussion that the relationship between mass loss and time of the 2nd order reaction is similar to that of the depolymerization including the vaporization process at the earlier times. Some of TG curves of PTHF are not dependent on the heating rate. This independence depends on the size of sample. The order of event of PTHF, which is obtained from TG curves dependent on the heating rate, is the 0th. The event order equal to the 0th reflects major contribution of vaporization in the event. The TG behaviors shown by the procedure mentioned above for the PMMA/PTHF blends with the smaller PMMA or PTHF contents cancel those of PMMA or PTHF.

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Abstract  

Miscibility in blends of semicrystalline polymers (poly(ethylene) adipate and poly(tetrahydrofuran)) and liquid crystal cholesteryl palmitate was investigated by means of differential scanning calorimetry and polarizing optical microscopy. Some(concentration-dependent) miscibility was found. A more pronounced miscibility exhibits the polyester-based blends probably due to the similar chemical structure of the two components and stronger interactions between the two components.

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) shows many features in common with its homologues poly(trimethylene oxide) and poly(tetrahydrofuran), with the main degradation processes being accounted by homolysis of the C–O backbone [ 25 , 26 ]. The weakest bond in the backbone, and, therefore, the

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, Ishimaru , K , Kojima , T 2002 Thermogravimetric studies on poly(methyl methacrylate), poly(tetrahydrofuran) and their blends . J Therm Anal Calorim 70 : 747 – 753 10.1023/A:1022295917890 . 5

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