The Study on Preparation, Characterization, Mechanical, and Thermal Properties of PA6/ Montmorillonite Nanocomposite Materials

• Main Authors: Chi-Chang Hung, 洪祺展
• Other Authors: Sung-Po Liu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/03588180196413921253

碩士 === 清雲科技大學 === 機械工程研究所 === 96 === This research with nylon 6 be the matrix material, adding the different weight percentages (0.5, 1, 3, 5 wt％) of MMT, after using a twin-screw extruder to mixing, then use grain machine to make into plastic grain, the end makes nanocomposites by hot press method, observe the variety of the mechanical strength and thermal property of this nanocomposites. It is found that the MMT joins the 3 wt%, such as tensile, deflect and hardness strengths etc., all have the result of the increase, promoting 18.40%, 29.41%, 33.55% respectively, even strengthening 38.67% in the wearing tests. Besides deflect test, the MMT content increases to 3 wt%, the specimen is transformed change the original elastic deformation to plastic deformation, at the MMT content raises to 5 wt%, the deflect specimen then presents break. In hardness test, the MMT content at 5 wt%, the hardness value is most high. From the load - displacement diagram to judge by the original matrix material of soft tough for join the MMT 3 wt% of hard tough, at join the MMT 5 wt% then present the hard brittleness. Observing worn surface and impact cross section by scanning electron microscopy (SEM), increase the MMT 3 wt%, considerable find out that the material essence to change into the hard tough from the SEM and the previous mechanical property, so more the ability wear, wear amounts will be smaller. Besides, by impact cross section also observed while increase the MMT 1 wt%, can also preserve the impact property of the matrix material, impact cross section to present the silk like form, similar to the impact test result. At the thermal property, using by differential scanning calorimeter (DSC) and thermo gravimetric analyzer (TGA), the MMT joins to the melting temperature(Tm) have no too greatly influence to the PA6 nanocomposites. The lowest 221.20 ℃ has the 1 ℃ with the most high 222.66 ℃ margin only. Measure the thermal degradation temperature (Td), the content that joins the MMT is more many, the degradation energy needed also immediately increases, finally measuring the Td is 433.48 ℃ of the matrix material, the Td that in increasing the MMT 5 wt% of the PA6 nanocomposites is the most high for 439.58 ℃, comparing with the matrix material, the Td promotes 6 ℃.