Morphology Of Carbon Nanotubes In The Low Density Polyethylene Matrix

Owing to their unique and superior physical and mechanical properties, CNTs (Carbon nanotubes) hold a great promise of extensive applications in various fields. Among others,CNTs have been thought as a very promising candidate as the ideal reinforcing materianls for advanced composites with good thermal,electrical and mechanical properties. But there were lots of problem to solve,such as the technology is complex,the cost is high but the yield is low,impurity in matrix tend to form aggregates,it isn't easy to align for CNTs,there isn't a strong adhesion between CNTs and polymeric matrix.In this thesis,MWNTs (multe-walled carbon nanotubes) /LDPE (low-density polyethylene) composites was prepared with LDPE as matrix and MWNTs as intensifier. MWNTs were dispersed ideally through technology of supersonic,stir and banburying. And MWNTs /LDPE composite was dispersed by mold that made by ourself to enhance the alignment. The degree of dispersion was tested and probed with FEI sirion SEM,at the same time the effect shaping process on dispersion was analysised. The tensile strength and elastic modulus of specimen were characterized by tensile machine. The Izod impact tests were performed using acute notched specimens. The effect different content of MWNTs on thermal and mechanical properties of composites were discussed.It can be concluded from the report that MWNTs in LDPE has some dispersion and oriention,and the mechanical properties of the composites have increase when compared pure LDPE. That also indicate the technology that used dispersion and alignment of MWNTs in LDPE is available...