Crosslinking behaviour of diolmodified epoxies

Polymer reinforced silica aerogels: effects of dimethyldiethoxysilane and bis(trimethoxysilylpropyl)amine as silane precursors

“…The peaks occurring at À101 and À110 ppm correspond to Q 3 and Q 4 coordinated silicon atoms derived from TEOS, respectively. 23,24 The peak located at À66 ppm is associated with the T 3 peak stemming from APTES or BTMSPA. 25 The shoulder appearing to the le of the T 3 peak indicates some contribution from T 2 .…”

“…23 The peaks at 73, 65 and 30 ppm are also associated with carbons from the epoxy oligomer. 24 The peaks at 10, 23, and 40 ppm in Fig. 2a-c come from APTES, 12,24 while the peak at 1 ppm stems from the methyl groups on DMDES.…”

“…24 The peaks at 10, 23, and 40 ppm in Fig. 2a-c come from APTES, 12,24 while the peak at 1 ppm stems from the methyl groups on DMDES. 27 As expected, increasing the DMDES concentration increased the height of the peak at 1 ppm.…”

Photopolymerization of an expanding monomer with an aromatic dioxirane

“…To do this, a simple model system consisting of an aromatic dioxirane (bisphenol A diglycidyl ether, BADGE) and an unsubstituted spiroorthocarbonate (TOSU) was chosen. BADGE is representative of aromatic dioxiranes that are used as base resins, and there are many studies describing the NMR analysis of its polymerization 16–18. TOSU was chosen because it can only polymerize via spirocyclic ring opening.…”

“…Cationic polymerizations of BADGE (also known as the diglycidyl ether of bisphenol A, or DGEBA) and other oxiranes have been widely studied for decades using infrared and 13 C‐NMR spectroscopy 16–18, 22. Both techniques can monitor the disappearance of oxirane and other functional groups in monomers, along with the appearance of hydroxyl, ether, carbonyl, and other groups in polymers.…”