Novolac Structure. Schematic illustration of hexa induced microgel formation in novolak... Download Scientific The structure of the polymer was investigated from its FT-IR and 1 H NMR spectra Thermal behavior of molecular mobility obtained from spin-spin relaxation time, T 2, indicates that the hydrogen bond network formed in novolacs is predominant factor of glass transition for novolacs without cross-link agents.
Chemical structure of the epoxy novolac resin system (DOPO modification... Download Scientific from www.researchgate.net
The structure of the polymer was investigated from its FT-IR and 1 H NMR spectra In either case, the curing agent is a source of formaldehyde which provides bridges between novolac chains, eventually completely crosslinking the system
Chemical structure of the epoxy novolac resin system (DOPO modification... Download Scientific
Thermal behavior of molecular mobility obtained from spin-spin relaxation time, T 2, indicates that the hydrogen bond network formed in novolacs is predominant factor of glass transition for novolacs without cross-link agents. Methylene groups act as linkages between two phenol units The novolac phenolic resins can be obtained in a moderately acidic medium (pH 4-6) in the presence of divalent metal acetate catalysts (Ca, mg, Zn, Cd, Pb, Cu, Co and Ni) or in a strongly acidic medium (pH 1-4)
Chemical structure of novolac and resole(Espinosa et al. 2004) Download Scientific Diagram. Download scientific diagram | Novolac resin structure The neat novolac char morphology shows rough and uneven surface (see Figure 1 1, upper image), and a typical carbon black like char residue structure is represented in the image with higher.
Structure of the Epoxy Novolak Resin polymer Download Scientific Diagram. Novolaks (sometimes: novolacs) are low molecular weight polymers derived from phenols and formaldehyde.They are related to Bakelite, which is more highly crosslinked.The term comes from Swedish "lack" for lacquer and Latin "novo" for new, since these materials were envisioned to replace natural. Novolac resins obtained in a moderately acidic medium have many ortho-ortho linkages and are known as 'high-ortho novolacs'.