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A novel method of hyperbranched poly(amide‐ester) modifying nano‐SiO 2 and study of mechanical properties of PVC/nano‐SiO 2 composites
Author(s) -
Zhao Hui,
Sun Ruimin,
Luo Yunjun,
Li Jie
Publication year - 2008
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.20427
Subject(s) - materials science , composite material , ultimate tensile strength , flexural strength , scanning electron microscope , composite number , nano , monomer , izod impact strength test , fourier transform infrared spectroscopy , polyvinyl chloride , polyamide , polymer , chemical engineering , engineering
Abstract A new method of surface chemical modification of nano‐SiO 2 was proposed in the paper. In the presence of catalyst, the active hydroxyl groups on the surface of nano‐SiO 2 reacted with AB 2 ‐type monomer ( N , N ‐dihydroxyethyl‐3‐amino methyl propionate) by one‐step polycondensation. And the product's Fourier transform infrared graphs and transmission electron microscopy (TEM) images proved that hyperbranched poly(amine‐ester) (HPAE) was grafted from nano‐SiO 2 surface successfully. Moreover, polyvinyl chloride (PVC)/modified nano‐SiO 2 composites were made by melt‐blending. The composites' structures and mechanical properties were characterized by TEM, scanning electron microscopy, and electronic universal testing machine. The results showed that nano‐SiO 2 grafted by HPAE increased obviously in dispersion in PVC matrix, and mechanical properties of PVC were effectively improved. Additionally, it was found that mechanical properties of PVC/nano‐SiO 2 composites reached the best when weight percent of nano‐SiO 2 in PVC matrix was 1%. Compared with crude PVC, the tensile strength of HPAE grafted nano‐SiO 2 /PVC composite increased by 24.68% and its break elongation, flexural strength, and impact strength increased by 15.73, 4.07, and 184.84%, respectively. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers