Dendritic polyesters bearing COOH groups at the focal points were grafted onto nanometer silica premodified with 3-aminopropyltriethoxysilane by N,N′-dicyclohexylcarbodiimide mediated amidation. The products were cha...Dendritic polyesters bearing COOH groups at the focal points were grafted onto nanometer silica premodified with 3-aminopropyltriethoxysilane by N,N′-dicyclohexylcarbodiimide mediated amidation. The products were characterized qualitatively by FTIR, TGA and elemental analysis. It was shown that a significant grafting （10%15% net grafting for this reaction） was obtained despite the steric hindrance of the dendrons.展开更多
In this paper the toughening mechanism of PVC/CPE filled with nanoscale SiO 2 and the effects of nanoscale SiO 2 and common SiO 2 contents on properties of PVC/CPE were studied.The experimental results showed PVC/CPE/...In this paper the toughening mechanism of PVC/CPE filled with nanoscale SiO 2 and the effects of nanoscale SiO 2 and common SiO 2 contents on properties of PVC/CPE were studied.The experimental results showed PVC/CPE/SiO 2 had excollent notched impact strength and tensile strength when nano SiO 2 content was 6 per cent to 12 per cent.Local SiO 2 had no obvious toughening effect on PVC/CPE,but made the tensile strength and elongation at break of PVC/CPE decreased obviously.展开更多
文摘Dendritic polyesters bearing COOH groups at the focal points were grafted onto nanometer silica premodified with 3-aminopropyltriethoxysilane by N,N′-dicyclohexylcarbodiimide mediated amidation. The products were characterized qualitatively by FTIR, TGA and elemental analysis. It was shown that a significant grafting （10%15% net grafting for this reaction） was obtained despite the steric hindrance of the dendrons.
文摘In this paper the toughening mechanism of PVC/CPE filled with nanoscale SiO 2 and the effects of nanoscale SiO 2 and common SiO 2 contents on properties of PVC/CPE were studied.The experimental results showed PVC/CPE/SiO 2 had excollent notched impact strength and tensile strength when nano SiO 2 content was 6 per cent to 12 per cent.Local SiO 2 had no obvious toughening effect on PVC/CPE,but made the tensile strength and elongation at break of PVC/CPE decreased obviously.
