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Study on the HDPE and Nano-CaCO3 Composite Impact Toughness

Author: HaoHongBo
Tutor: WangZuo
School: West China University
Course: Materials Processing Engineering
Keywords: High density polyethylene Nano Calcium Carbonate Blends Impact strength SEM
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 92
Quote: 0
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Abstract


This paper examines the impact strength of HDPE material at different temperatures , different notch depth and impact rate , Instrumented impact testing instrument impact force - displacement curve calculated for each sample corresponding toughness parameter DI quantitative analysis of the temperature , impact rate and notched impact toughness of depth of HDPE HDPE impact strength values ??of its results with the corresponding results of the analysis are consistent . SEM observation reveals the impact fracture under different temperature conditions at the same time as the temperature decreases , the cross section of the middle part tends to flat belt and rough with alternating white parabolic morphology , both sides of the mirror zone tends to be constituted by crazing microfiber reduce , mirror area were ductile fracture . By two-roll mill blend physical blending method , toughening modification of HDPE with stearic acid surface treatment of nano CaCO3 . The mechanical properties of the test of the nano CaCO3/HDPE composite nano-CaCO3 content on impact and tensile properties of the nano CaCO3/HDPE composite nano-CaCO3 content of 3% , the impact strength of the maximum value. SEM observation : nano CaCO3 content of 1% to 3% range , the nanoparticles are more evenly distributed in the matrix HDPE reunion small particle size , particle size can be when nano-CaCO3 content of 5% to 6% , the reunion to 5μm. EVA3 of dispersant added to the pair of the nano CaCO3/HDPE composites , which significantly improve the mechanical properties , the optimum dosage of EVA3 right nanometer CaCO3/HDPE composite material is 0.2% . This paper also examines the the EVA3 amount of 0.2 % , nano- CaCO3 content of nanometer CaCO3/HDPE composite material , impact and tensile properties . The experimental results show that : EVA3 added nano CaCO3/HDPE composites impact strength , yield strength , elongation at break , etc. with different degrees of increase . SEM cross-section observation reveals : the added dispersant EVA3 , CaCO3 nanoparticles in the matrix HDPE distribution has greatly improved , especially the size of the particles significantly reduced .

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