Thermal and Rheological Properties of LaRC-TPI 1500 Series Polymers

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Abstract
The crystallization behavior and the melt flow properties of two batches of 1500 series LaRC-TPI polymers from Mitsui Toatsu Chemicals (MTC) have been investigated. The characterization methods include Differential Scanning Calorimetry, X-ray diffractography and melt rheology. The as-received materials possess initial crystalline melting peak temperatures of 295°C and 305°C, respectively. These materials are less rapidly recrystallizable at elevated temperatures when compared to other semicrystalline thermoplastics. For the samples annealed at temperatures below 330°C, a semicrystalline polymer can be obtained . On the other hand, a purely amorphous structure is realized in the samples annealed at temperatures above 330°C. Isothermal crystallization kinetics were studied by means of the simple Avrami equation. The viscoelastic properties at elevated temperatures below and above Tg values of the polymers were measured. Information with regard to the molecular sizes and distribu tions in these polymers were also extracted from melt rheology.