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Preparation, Morphology and Properties of Poly(Trimethylene Terephthalate)/poly(Ethylene 2,6-naphthalate) Blends

Author: WangYingJin
Tutor: GaoJunGang；RunMingTao
School: Hebei University
Course: Materials Physics and Chemistry
Keywords: Polyethylene terephthalate Poly ethylene naphthalate Crystallization Kinetics Thermal decomposition kinetics Blends
CLC: TQ322.3
Type: Master's thesis
Year: 2007
Downloads: 32
Quote: 1
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Abstract


Polyethylene terephthalate (Polytrimethylene terephthalate, abbreviated PTT) is the second polyethylene terephthalate (PET) and polyethylene industrialization terephthalate (PBT) industry, the new industrial-scale development The polyester fiber material can become. In recent years, foreign countries have begun large-scale production and development of PTT, PTT excellent elasticity and ease of dyeing fiber materials industry attention caused abroad has it as one of the 21st century, new fibers. In addition, PTT has also studied in the field of engineering plastics gradually unfolded in the field of engineering plastics is a potential for development of new materials. Domestic PTT research is still in its infancy, and mainly focus on fiber research and development, in the field of engineering plastics few. This article is based PTT Chemical, physical characteristics, combined with a polymer blend modified principle, preparation of PTT / PEN blends and systematic study of their structure and performance. Differential scanning calorimetry (DSC) and polarized optical microscopy (POM) studied the PTT and PEN blends the glass transition temperature, crystalline melting behavior, isothermal crystallization kinetics and crystal morphology. Respectively Avrami equation and Hoffman-Lauritzen theory isothermal crystallization process of the deal. It was found that the amorphous blend sample zones are fully compatible, all blend samples exhibit a relatively wide glass transition temperature. Isothermal crystallization process Avrami exponent n is within the range of 3.0 to 3.2, three-dimensional growth of the crystal growth. Isothermal crystallization occurs after melting triple melting peaks, corresponding to the PTT melt (low temperature) and PEN imperfections and more perfect crystals melt (high temperature). Arrhenius equation with the crystallization activation energy of the blend, was found when the PTT content of 40% less than the activation energy of crystallization PTT content of 20% of the samples, indicating that the PTT joined promotes crystallization of PEN. From Hoffman-Lauritzen equation obtained PTT content of 20% and 40%, the blending Kg samples were 1.5 × 105and 1.8 × 105K2, and the crystal growth is calculated per unit area of ??the side surface and the surface free energy of folded chain . Avrami analysis of the results and the results were consistent. Blending crystalline morphology of samples found with the PTT content increases, the crystal size becomes larger, the crystal becomes more perfect. Studied by thermal gravimetric analyzer under inert atmosphere polyethylene terephthalate (PTT) / poly ethylene naphthalate (PEN) blends behavior and non-isothermal decomposition kinetics. Found that different PTT / PEN blends thermal degradation of the thermal decomposition of a major thermal decomposition reaction is first. PEN blends with the increasing mass fraction, the initial decomposition temperature of the blend gradually increased, the thermal stability of the blend gradually increased, and the thermal decomposition reaction of the blend gradually increased activation energy, which is As a naphthalene ring in the molecular chain PEN thermal decomposition temperature than the phenyl ring PTT high, the thermal stability of the molecular chain is higher than PTT. Naphthalene ring blends the chemical composition content is higher, the higher the thermal stability.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Synthetic resins and plastic materials > Engineering plastics
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