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Preparation of PA6/Nano-Magnesium Hydroxide Composite by in Situ Polymerization

Author: WeiZuo
Tutor: LiuShengPeng
School: Wuhan Institute of Technology
Course: Chemical processes
Keywords: Nylon 6 Magnesium hydroxide Situ polymerization Silane coupling agent Modified Mechanical Properties
CLC: TB33
Type: Master's thesis
Year: 2011
Downloads: 54
Quote: 1
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Abstract


Firstly surface modification treatment with a silane coupling agent KH-550 nano magnesium hydroxide and magnesium oxide whisker (MH) , and then the nano-magnesium hydroxide and magnesium hydroxide whiskers with caprolactam monomer mixed with methanol and the sodium-based catalyst prepared by anionic situ polymerization method PA6/MH composites . FTIR, DSC, SEM, DMA, XRD, TGA, mechanical tests, the melt flow rate testing modified MH anionic polymerization PA6, the structure and performance of the in situ polymerization PA6/MH composite analysis and research . FTIR, TGA and XRD results show that : KH550 has been grafted on the the MH surface of the catalyst sodium methylate PA6 polymorphs and mechanical properties unchanged . PA6/MH tensile strength and impact strength are presented with nano- MH and MH whisker fill the trend first and then decreased . When the added amount of 3 % and 1% , respectively , the the nanometer MH/PA6 composite material and MH whisker / PA6 composites tensile strength and impact strength showed a significant enhancement of the toughening effect . MH add to greater than 3%, the tensile strength and impact strength decreases linearly with the MH filling amount trend . Adding a modified MH particles PA6/MH composites tensile strength and the impact strength was significantly higher than the corresponding value of the filling unmodified MH particles PA6/MH composites . That modified MH can improve the interfacial adhesion of the particles and PA6 matrix to improve its dispersibility PA6 matrix reduce MH particle agglomeration . TGA results show that , compared with the pure PA6 , added improved the thermal stability of the composite material of the 1% and 5 % nano MH in the low temperature phase is respectively lowered and raised , and the composite material into carbon somewhat . Was significantly higher than in the PA6/MMH composites T_c pure PA6 -T_c composites T_c PA6/MH slightly lower than pure PA6 T_c, indicating that the modified MH particles induced PA6 crystallization nucleating agent , improving PA6 in crystallization rate of the composite material . Both PA6/MH composite T_g higher than the pure PA6 T_g , PA6/MMH composite T_g to high temperature is slightly offset , offset by less than the the same MH particles the filling amount PA6/MH composite material . Addition of modified and unmodified MH whiskers are to make the melt viscosity of the composite material is increased , the flow properties decreased , but the melt viscosity of PA6/MMH composite materials significantly lower than PA6/MH composites , indicating that the modified MH particles help to improve the processing performance of the composite material .

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials
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