Polyethylene terephthalate succinic ester

Because two methyl closed phenolic groups on the activity of two adjacent points, injection molding processing factory PPO has excellent chemical stability; PPO itself does not contain polar groups, and thus has excellent electrical insulation; In addition, there were in the molecular structure of the PPO hydrolysis groups, has the very outstanding water resistance. PPO for amorphous polymers, neat and symmetric structure, but as a result of PPO itself has certain ability of crystallization, just because of the Tm and Tg are smaller, when cooling, from the molten state to form the crystallization time is short, make the macromolecular chain too late, so general amorphous polymer formation. But near the Tm constant temperature time, crystallization PPO can be obtained.

as a result of the strengthened PBT, mechanical performance is low, at present most with glass fiber reinforced modified PBT, in order to obtain excellent mechanical properties and thermal properties of the products. Enhanced the impact strength increased more than 2 times, the tensile strength increased more than twice, heat-resisting temperature increased about 4 times. PBT, another outstanding performance is excellent electrical insulation properties, even in damp, high temperature, high frequency and bad work environment, electrical insulation also won't appear problem, make its in electronics, electrical industry has important application value.

polyphenyl ether PPO has excellent physical and mechanical properties and excellent high temperature resistance and resistance to creep property, but melt illiquid, processing difficult. To this end, often with PS or HIPS PPO blending or copolymerization modification, in order to improve the melt liquidity, improve the processing performance, cost would be reduced at the same time, the current main varieties used in the actual production is such, called MPPO, accounting for more than 90% of the yield of PPO.

PBT, are the main disadvantages of low notched impact strength, molding shrinkage rate, flame retardant. By blending method of adding plastic additives, enhanced and improved, many varieties of modified PBT, appear. PBT melt viscosity low, with sufficient flow length, suitable for thin wall and complex shape, long flow channel of all kinds of products, is a good material of plastic injection molding. And the crystallization of PBT, speed, molding cycle is short, when we do the injection mould for normal temperature also can get the products of the high degree of crystallinity, which is especially suitable for rapid injection molding, to meet the demand of the productivity. However, under the condition of the melt temperature higher than 270 ℃ for a long time may be due to the thermal degradation and improves the performance of the products.

polyphenylene oxide preparation based on phenol as raw material, under the effect of MgO style catalytic reaction with formaldehyde to get 2, 6 dimethyl phenol, again under the CuCl2 catalytic oxidative coupling polymerization. Aggregation of PPO and PS or HIPS blending according to ratio of 7:3, MPPO through twin-screw extruder granulation. For further improve the mechanical performance can add chopped glass fiber enhanced by 25%. PPO macromolecular main chain is made up of aromatic ring and alternating ether bond, aromatic ring makes the molecular chain itself has high rigidity and hardness, when stress reflect the deformation characteristics of small size, temperature, and a large number of ether bond on the molecular chain has certain flexibility, PPO excellent impact resistance and low temperature performance.

compared with PET, PBT, macromolecular chain of repeat unit has four methylene, namely flexible chain, rigid part density decreased. So its rigidity, hardness, Tg and Tm was lower than those of PET, but higher toughness. PBT, more easy to crystallization, a PET crystallization rate is fast, has a large effect on processing performance. PBT, appearance for the milky white or light yellow, the surface luster, relative molecular weight is 30000 - 40000.

PBT can be used such as injection molding, extrusion, mould molding method, can also be used for coating, bonding, ultrasonic welding, and other secondary processing. Among them is given priority to with processing and injection molding. Processing of injection molding with single screw injection molding machine, cylinder temperature control in 230 - in general Between 270 ℃ and cylinder temperature is exorbitant, can make the tensile strength decreased. Strengthened PBT, mold temperature is about 60 ℃, the reinforced PBT is about 80 ℃. In the die temperature, to obtain high surface gloss products, is advantageous to the stripper. PBT, application of electronic and electrical industry is the biggest market.

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