科研之友
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摘要
In the present study, different series of High Density Polyethylene (HDPE)/nanoclay composites were prepared using melt blending in a co-rotating intermeshing twin screw extruder. For developing composite material, commercial injection molding grade HDPE was physically mixed with nanoclay particles (Montmorillonite P-801, MMT) in the ratios of 0, 3, 6 and 9 wt% and fed on Farrell co-rotating intermeshing twin screw extruder at 12 rpm and 190 degrees C and conditioned to get standard ASTM D638 type I specimen. The morphological observation showed a clear dispersion of nanoclay in HDPE and increased surface roughness with increasing percentages. The X-ray diffraction results indicated no phase change of HDPE due to the addition of nanoclay however a slight decrease in crystallinity and increased FWHM is noticed. FTIR studies indicated interaction between HDPE and nanoclay by forming a broad band from 790 to 806 cm(-1) due to the CH2 starching and O-H group at 3350 cm(-1). Thermal characterization indicated degradation of all HDPE/nanoclay samples begins at about 370 degrees C, while the initial decomposition temperature of pure HDPE is at about 429 degrees C indicating reduced thermal stability with increasing nanoclay percentage. The nano-mechanical properties was studied as a function of strain rates of 1, 2 and 4 s(-1) that resulted in increased hardness and elastic modulus. Similarly, the nano indentation test results showed that the elastic modulus and hardness increases with increasing the loading of nanoclay. Addition up to 6 wt% of nanoclay increases load bearing capacity to a maximum load of 16 mN while 9 wt% deteriorates the maximum load to 14 mN. The changes due to nanoclay incorporation resulted in the altered mechanical properties of HDPE/nanoclay composites due to decrease of free volume and hence restricted mobility because of the cationic properties of MMT.
- 出版日期2016-2
