The effects of HDPE matrix toughness on the brittle-ductile transition of HDPE/CaCO_3blends are investigated. Not all HDPE can be toughened by CaCO_3 particles. The ability of thematrix to yield plays a fundamental ro...The effects of HDPE matrix toughness on the brittle-ductile transition of HDPE/CaCO_3blends are investigated. Not all HDPE can be toughened by CaCO_3 particles. The ability of thematrix to yield plays a fundamental role in determing whether HDPE can be toughened or not.There exists a critical matrix toughness (I_(sc)≈45J/m) below which HDPE can not be toughenedobservably by CaCO_3 particle at given average size, and above which the critical matrix ligamentthickness (τ_?) is proportional to matrix impact strength.展开更多
The aim of this work was to study the influence of CaCO3 in both tensile and flexural mechanical properties of a PET(polyethylene terephthalate)/PP(polypropylene).Four compositions of PET/PP/CaCO3 blend were prepared ...The aim of this work was to study the influence of CaCO3 in both tensile and flexural mechanical properties of a PET(polyethylene terephthalate)/PP(polypropylene).Four compositions of PET/PP/CaCO3 blend were prepared by injection molding with CaCO3 content of 0,2,4 and 6 wt%.The samples were cut according to the ASTM(American Society for Testing and Materials)standard and tested by using universal testing equipment.The results show that the mechanical properties of the PET/PP/CaCO3 composites with 2%and 4 wt%of CaCO3 composition were better than that of the PET/PP composites.While the content of CaCO3 is 6 wt%,the serious phase separation between PET and PP resulted in poor mechanical properties of the PET/PP/CaCO3 samples.This study shows that CaCO3 has played a role to improve the tensile and flexural properties of the mixing product if it is present only in a small amount.展开更多
Recycled polyethylene terephthalate (RPET) and recycle polypropylene (RPP) blends filled with a renewable filler, i.e. cockleshell-derived CaCO3 (CS) were prepared as an environmental friendly thermoplastic composite....Recycled polyethylene terephthalate (RPET) and recycle polypropylene (RPP) blends filled with a renewable filler, i.e. cockleshell-derived CaCO3 (CS) were prepared as an environmental friendly thermoplastic composite. The effects of CS particle size and content on thermal stability, mechanical performance and flame retardant properties of the blends were investigated. Thermogravimetric analysis was performed to elucidate the thermal decomposition kinetics of the filled composites. The iso-conversion of the Flynn-Wall-Ozawa was developed by the second order polynomial function for thermal oxidative degradation of the blends while peak derivative temperature from the Kissinger method was able to verify the mechanism of degradation in these blends. The results indicated that both CS and commercial grade CaCO3 improved thermal stability and enhanced the stiffness as well as impact performance of the blends. However, this could only be achieved when high filler content was present in the RPET/RPP blends.展开更多
基金This project is supported by the National Natural Science Foundation of China.
文摘The effects of HDPE matrix toughness on the brittle-ductile transition of HDPE/CaCO_3blends are investigated. Not all HDPE can be toughened by CaCO_3 particles. The ability of thematrix to yield plays a fundamental role in determing whether HDPE can be toughened or not.There exists a critical matrix toughness (I_(sc)≈45J/m) below which HDPE can not be toughenedobservably by CaCO_3 particle at given average size, and above which the critical matrix ligamentthickness (τ_?) is proportional to matrix impact strength.
文摘The aim of this work was to study the influence of CaCO3 in both tensile and flexural mechanical properties of a PET(polyethylene terephthalate)/PP(polypropylene).Four compositions of PET/PP/CaCO3 blend were prepared by injection molding with CaCO3 content of 0,2,4 and 6 wt%.The samples were cut according to the ASTM(American Society for Testing and Materials)standard and tested by using universal testing equipment.The results show that the mechanical properties of the PET/PP/CaCO3 composites with 2%and 4 wt%of CaCO3 composition were better than that of the PET/PP composites.While the content of CaCO3 is 6 wt%,the serious phase separation between PET and PP resulted in poor mechanical properties of the PET/PP/CaCO3 samples.This study shows that CaCO3 has played a role to improve the tensile and flexural properties of the mixing product if it is present only in a small amount.
文摘Recycled polyethylene terephthalate (RPET) and recycle polypropylene (RPP) blends filled with a renewable filler, i.e. cockleshell-derived CaCO3 (CS) were prepared as an environmental friendly thermoplastic composite. The effects of CS particle size and content on thermal stability, mechanical performance and flame retardant properties of the blends were investigated. Thermogravimetric analysis was performed to elucidate the thermal decomposition kinetics of the filled composites. The iso-conversion of the Flynn-Wall-Ozawa was developed by the second order polynomial function for thermal oxidative degradation of the blends while peak derivative temperature from the Kissinger method was able to verify the mechanism of degradation in these blends. The results indicated that both CS and commercial grade CaCO3 improved thermal stability and enhanced the stiffness as well as impact performance of the blends. However, this could only be achieved when high filler content was present in the RPET/RPP blends.
