Novolac Structure. Schematic illustration of hexa induced microgel formation in novolak... Download Scientific Base-catalysed phenol-formaldehyde resins are made with a formaldehyde to phenol ratio of greater. Methylene groups act as linkages between two phenol units
Structure of the Epoxy Novolak Resin polymer Download Scientific Diagram from www.researchgate.net
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) 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
1 H pulse NMR and 13 C CPMAS NMR measurements are carried out for novolac resins in order to investigate the structure and curing mechanism 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) Segment of novolak, illustrating the predominance of cresol subunits and presence of crosslinking.
60 Years of Photoresist Materials Part 3 The Age of Novolak/DNQ. The structure of the polymer was investigated from its FT-IR and 1 H NMR spectra A representative chemical structure for a novolac is shown in Figure 1
Tunable thermal, mechanical, and controlledrelease properties of epoxy phenolic novolac resin. 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) Download scientific diagram | Structure of novolac resin