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Study on the Preparation and Structure-Property of Thermoplastic Polyamide-6 Elastomer

Author: WangHaoJian
Tutor: WangChaoSheng
School: Donghua University
Course: Materials Processing Engineering
Keywords: Thermoplastic elastomers Polyamide 6 PTMG Block copolymer
CLC: TQ334
Type: Master's thesis
Year: 2010
Downloads: 259
Quote: 1
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Abstract


Thermoplastic elastomer (TPE) is a characteristic of both the rubber and the thermoplastic material, it not only at room temperature, like rubber elastic deformation, but also at high temperatures, like plastics such as plastic deformation, both the rubber elasticity and plastic melt fluidity. Polyamide-based thermoplastic elastomer (TPAE) recently developed a new type of thermoplastic elastomer and a thermoplastic polyurethane elastomer and a thermoplastic polyether ester elastomer, as part of segmented block copolymer. Polyamide 6 type thermoplastic elastomer (PEEA-6) is an important TPAE product. This synthesis of a block copolymer having a structure of segmented thermoplastic elastomer polyamide 6. Using the two-step synthesis, the first synthesis of double-ended carboxy-terminated prepolymer PA6, and with PTMG (PTMEG) is produced by the reaction of polyester thermoplastic elastomer, a polyamide 6. PA6 studied prepolymer molecular weight control methods, and the reaction temperature, time, vacuum, and catalyst, a stabilizer and an antioxidant amount of other synthetic process parameters and conditions are studied, the final polymerization of the prepolymer obtained optimal process Conditions: prepolymerization step 220 ℃ ~ 230 ℃ open loop 30min, 240 ℃ ~ 250 ℃ for 4 hours, 250 ℃ vacuum (for 1 hours vacuum 500-1000Pa). Preferably the block copolymer synthesis conditions: the reaction time of 3 hours, vacuum for 1 hour, the reaction temperature is 240 ~ 250 ℃, catalyst, the amount of tetra-n-butyl 1% of the amount of PTMG, the vacuum degree of the vacuum pump 500 ~ 1000Pa, in this condition, the resulting block copolymer PA6/PTMG relative viscosity of up to 1.74, the lowest rate of boiling water extraction was 3.6%. This synthesis of the block copolymer of the structure and properties studied, the IR spectra appeared stretching vibration of the ester carbonyl and ether bond symmetric and asymmetric stretching vibration, the product shows a block is connected to the ester bond copolymer. ~ 1H-NMR analysis showed that the product no unreacted polyether and polyamide prepolymer existence of all of the product elastomer polyamide 6, and the product of the ratio of hard and soft segments in accordance with the feed ratio. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) study, PEEA-6 at 300 ℃ less has good thermal stability, the conventional PA6 molding processing temperature 260-280 ℃, fully meet the blend or injection molding processing needs. PEEA-6 dynamic mechanical analysis (DMA) display having a Tg below -50 ℃, and have a good \Stress-strain test, Shore hardness testing show that with the soft segment of the segment PTMG or a percentage of the increase in growth, PEEA-6, the tensile strength, flexural modulus and Shore hardness decreased while the elongation at break rate has been increased up to the 478.14%, showing good properties of elastomer. Scanning electron microscopy (SEM) shows the phase structure of the elastic body is displayed as sea-island structure. With increasing content of PTMG soft segment polymer reflects the more ductile fracture.

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