PET water absorption was 0.6%, larger water absorption. PET and PET enhanced specific performance shown in Table 2: Table 3 neat PET and glass fiber reinforced PET Properties
High tensile strength of the mechanical properties of a PET film with aluminum foil daughter beauty, HDPE film nine times, three times the PC and PA film. PET small creep, excellent fatigue resistance (better than enhanced PC and PA), good wear resistance and abrasion resistance. Mechanical properties of PET is less temperature. B thermal properties thermal properties of pure PET is not high, but the enhancement processing greatly improved mechanical properties at 180 ? when better than PF laminate, is to enhance the heat-resistant engineering thermoplastics better varieties; PET resistance good heat aging, brittle transition temperature is 70 ?, at 30 ? still has a certain toughness; PET difficult to burn, the flame was yellow, off the drops. c electrical properties of PET, although a polar polymer, but excellent electrical insulating properties, at high frequencies still well maintained. PET is poor corona resistance, can not be used for high voltage insulation; electrical insulating properties affected by temperature and humidity, and greater humidity. d environmental performance PET containing an ester bond, not water and steam at high temperature conditions, the action of an acid and a base. PET organic solvent such as acetone, benzene, toluene, methyl chloroform, carbon tetrachloride and oils stable, some oxidation Health Products plastic bottle design ???43/60 such as hydrogen peroxide, sodium hypochlorite and potassium dichromate, also have a higher resistance. PET excellent weatherability, long-term for outdoor. Processing performance and processing characteristics of PET 3.3.1PET 3.3 processing process is a polar polymer melt temperature and melt viscosity are larger. PET is a non-Newtonian fluid, the viscosity is sensitive to temperature and shear rate sensitive little big. PET large water absorption, must be dried before processing; drying conditions of temperature 130 ~ 150 ?, time 3 ~ 4h. PET processing temperature range is narrow, generally 270 ~ 290 ?, close to the decomposition temperature of 300 ?, processing should pay attention to the temperature is not too high. PET is slow crystallization, to promote crystallization, often using high mold temperature, typically 100 ~ 130 ?. PET mold shrinkage large, can greatly reduce enhanced after modification, but after the production of high precision products to be processed. Post-processing conditions: temperature 130 ~ 140 ?, time 1 ~ 2h.
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