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Systematic study of three molecular weight polyethylene glycol (PEG), respectively, the crystallization behavior of PET of PEG4000, PEG6000, and PEG8000, crystal morphology, the influence of the crystalline structure, and simultaneously on glass fiber (GF) for PET Mechanics properties and crystallization behavior. Studied using differential scanning calorimetry (DSC) PET / PEG composite system and PET / GF crystallization behavior of the composite system, the kinetic analysis of the crystallization process of the composite system with Jeziorny theory; studied by polarized light microscopy (POM) PET / PEG crystalline morphology of the composite system, through the X-ray diffraction (XRD), the PET / PEG composite system and PET / GF a crystal structure of the composite system was studied. For the PET / PEG composite system, the three molecular weight of the PEG is added to the PET melt, are making PET, glass transition temperature and cold crystallization temperature was lowered, and the thermal crystallization temperature and melting temperature is elevated; simultaneous PET / PEG composite system of the table view of the induction period, the crystallization half time, and the apparent total crystallization time than pure PET's short; Jeziorny theory of PET / PEG composite system for non-isothermal kinetics studies, results showed that with the addition of the PEG, Avrami constant n decreases, crystallization rate constant Z c increases. Visible PEG is added to improve the exercise capacity of the segment of the PET molecular chains, and because of its compatibility with PET limitations, play a nucleation, shortening of PET crystallization cycle, to accelerate the crystallization rate of the PET, wherein the best PEG8000 addition amount of 10wt% PET / PEG composite system. Study results showed that the PEG added, are making PET nucleation density increases, the crystal size is smaller, more uniform distribution of crystal; of PEG added composite system by XRD crystalline POM crystalline form of PET / PEG composite system While PET / GF mechanical properties and crystallization behavior of the composite system was studied, the results showed that after treatment by the silane coupling agent KH550 glass fiber (GF) is added to the PET, the increase in tensile strength and impact strength of the PET, 30wt% glass fiber dosage, the improvement in mechanical properties of the composite system. DSC results showed that the fiberglass in PET nucleating effect, improve the thermal crystallization of the PET, but because of its hinder the PET molecular chain segment motion, so that the PET the cold crystallization diminished capacity. crystal size.
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