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Study on Preparation and Properties of High Heat Absorption Polyethylene Terephthalate (PET) Nano-composite Materials

Author: GaoFen
Tutor: GuXiaoHua
School: Qiqihar University
Course: Materials Processing Engineering
Keywords: PET High heat Non-isothermal crystallization Rheology
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 68
Quote: 0
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Abstract


Polyethylene terephthalate (PET) because of its excellent performance has gradually become the world's fastest growing packaging industry in the amount of resin is widely used in beverage, food packaging and other fields. It is so versatile because of PET, the number of tons of annual production capacity, in the promotion of energy conservation today, its production process saving is particularly important. In this paper, the modified nano titanium nitride high endothermic agent was added to the PET, were prepared by in situ condensation of the PET / TiN nanocomposites. By X-ray diffraction (XRD) and scanning electron microscopy (SEM) of the titanium nitride PET / TiN nanocomposite dispersion state; using a differential scanning calorimeter (DSC), polarized light microscopy (POM) of PET / TiN nanocomposites crystallinity; via thermal gravimetric analyzer (TGA) of the PET / TiN nanocomposite thermal stability; rotational rheometer with PET / TiN nanocomposites linear viscoelastic behavior. The results showed that: (1) physical connection titanium nitride in a matrix manner and PET compatible with the system in the composite material dispersed, did not produce agglomeration; nano additives added to improve the system of the cold crystallization peak temperature, reducing the melting and nucleation rate, increasing the crystallization time; Composites pure PET crystal morphology similar, but the grain size smaller than that of pure PET; (2) PET / TiN nano-composite material has an average temperatures than pure PET significantly improved, and the average temperature of the composite nano-absorbing unit with the increasing of the amount added, the nano-absorbing agent in the system heat played a significant role; (3) as composite materials and pure PET, with cooling rate increases, the sample thermal crystallization peaks shift to lower temperature, and the crystallization peak area increases relative to achieve the same degree of crystallinity at a lower temperature, longer time to complete under the conditions of the same sample at the same time, To achieve a higher degree of crystallinity of the selected cooling rate, the better the crystallinity completed faster at a low rate, at the same cooling rate, PET / PTT nanocomposite having a smaller than the pure Z c values ??and the larger t 1/2 values ??of nano-absorbing agent is added reflects its high heat performance, reducing the activation energy of crystallization of the system; (4) of each sample The loss modulus G \preferably less than 100s, more than 100s after the storage modulus G ', loss modulus G \* The stabilization time was extended to about 800s, pure PET, storage modulus G 'is greater than PET / TiN nano-composite materials, and the more the amount of nanoparticles added G' is smaller, the loss modulus of the composite material G \η * is less than pure PET, the composite frequency test temperature higher the storage modulus G 'and loss modulus G \

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