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Structure and Properties of Polyamide66(PA66) /TLCP/halloysite Nano-tubes In-situ Hybrid Composites

Author: GanDianSong
Tutor: NingPing
School: South China University of Technology
Course: Materials Science
Keywords: PA66 TLCP Halloysite nanotubes(HNTs) In-situ Hybrid Composite
CLC: TB33
Type: Master's thesis
Year: 2011
Downloads: 60
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Abstract


The“in-situ”composite technology is not only used for modifying plastics, but also used for investigating some new plastic products. So it has strong developing tendency and life-force. It’s necessary to develop a new kind of“in-situ”composite as the study of this area is going on and, consequently, lead to a new direction of investigation by thermal liquid crystal polymer (TLCP) blend with thermal plastics (TP) and inorganic or organic reinforcement materials for“in-situ”hybrid composite. In the thesis, polyamide66(PA66) was blended with thermal liquid crystal polymer (Vectra A950) and Halloysite nanobubes (HNTs) to prepare high performance“in-situ”hybrid composite.We also studied the influence of TLCP’s content on the properties and microstructure of PA66/TLCP blends by HAAKE torque rheometer, differential scanning calorimetry (DSC), DIN abrasion wear test machine and scanning electronic microscope (SEM) respectively. The results showed that the torque, viscosity, water absorption of blends was decreased after mixing with 4wt% of TLCP. Meanwhile, the wear-resistant was also improved. The DSC test showed that small amount of TLCP will increase the crystalline rate and promote composites crystallization. SEM photographs showed that the TLCP micro-fibrils were formed and well dispersed in matrix.We laid special stress on studied the influence of HNTs’s content on the comprehensive properties of PA66/TLCP/HNTs In-Situ Hybrid blends by HAAKE torque rheometer, Laser thermal conduction instrument, Differential scanning calorimetry (DSC), Thermogravimetric analysis (TG)、Dynamic mechanical thermal analysis (DMA)、Heat distortion temperature (HDT)、Fourier transform infrared (FTIR)、Scanning electronic microscope (SEM) respectively. The results showed that the thermal conduction property and the mechanical property of composites were improved obviously with the addition of HNTs, which act as nuclear agent promotes composites crystallization and accelerate the crystalline process. The result of HAAKE torque rheometer test showed that the torque of blends was decreased when the content of HNTs is no more than 15wt%. SEM photographs showed that HNTs dispersed well and ranged in one direction in PA66/TLCP composites. The composite showed excellent comprehensive properties when the composite consists of PA66(53wt%), TLCP(4wt%), HNTs(40wt%), EPEM-g-MAH(3wt%). Compared with pure PA66, the thermal conductivity raised by 181.6% and up to 0.445(W/m.k), the tensile strength, flexural strength, flexural modulus and HDT of the composites were increased by 26.2%, 41.5%, 241.5% and 148.4% respectively. In other words, the blends have the best comprehensive properties.

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