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Using self‐synthesized aminopropyl‐terminated polydimethylsiloxane to toughen epoxy resin: The role of molecular weight of polydimethylsiloxane
Author(s) -
Ran Qianping,
Li Bo,
Sun Dewen,
Yin Hao,
Wan Yun,
Yang Chong,
Liu Yuting,
Mao Yonglin
Publication year - 2017
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.21506
Subject(s) - epoxy , polydimethylsiloxane , materials science , diglycidyl ether , fourier transform infrared spectroscopy , scanning electron microscope , composite material , toughness , agglomerate , polymer chemistry , elastomer , bisphenol a , chemical engineering , engineering
Aminopropyl‐terminated polydimethylsiloxane (APDMS) with different molecular weights (M ¯ n ) were synthesized by 1,3‐ bis (3‐aminopropyl)‐1,1,3,3‐tetramethyldisiloxane (BADS) and dimethylcyclosiloxane ( D n ). Fourier‐transform infrared shows the increase in APDMSM nand the decrease in NH 2 content in the products with the increasing ratio of D n /BADS. 1 H NMR further confirmed the conclusion obtained by Fourier‐transform infrared spectra, and the APDMSM nresulted from 1 H NMR were 1,106 (APDMS1), 1,987 (APDMS2), 2,690 (APDMS3), and 4,313 (APDMS4) g/mol. These APDMS were then blended with the epoxy resin (diglycidyl ether of bisphenol A) system to improve its toughness. Mechanical tests revealed that the impact strength of the epoxy resin was improved by APDMS1 and APDMS2, which has lowerM n . The toughening effect decreased when APDMS4 was used. It was suggested that the APDMS with highM nwas easier to agglomerate, which in turn resulted in lower toughening efficiency. This was also confirmed by scanning electron microscopy results. J. VINYL ADDIT. TECHNOL., 23:305–311, 2017. © 2015 Society of Plastics Engineers