Adhesives from Autohydrolysis Bagasse Lignin, a Renewable Resource - Part II. DSC Thermal Analysis of Novolac Resins

Abstract

Incorporation of autohydrolysis bagasse lignin into phenol, crcsylic acids novolac Systems via the phenolation route and a pitch-lignin mixture for binders in cellulose-based composities was studied by DSC (Differential Scanning Calorimetry). Different phenolic components were used in order to cvaluate the curing behaviour of various resin Systems. This technique clearly showed that novolac resins with a lignin constituent had a lower heat of reaction during the eure than their pure phenolic counterparts. It proved that lignin acted äs a low reactive filier. Novolacs made with lignin showed a similar eure ränge äs their pure phenolic equivalents. The exothermic reactivity of the lignin-novolacs decreased by a fraction equal to the lignin content of the resin, which indicated that only the phenolic part was responsible for the exothermic reaction of the resin during curing.

Impregnated Paper-Based Decorative Laminates Prepared from Lignin-Substituted Phenolic Resins

“…Many different phenolic resins containing various types of lignin were assessed for their gluing performance as binder materials of engineered wood [41][42][43][44] or for their suitability as impregnation resins for the manufacture of decorative laminates [40,[44][45][46][47]. With the latter application, the homogenous impregnation and deep saturation of Kraft papers is very important.…”

Matriz termofixa fenólica em compósitos reforçados com fibras de bagaço de cana-de-açúcar

“…A lignina do bagaço de cana já foi utilizada na substituição parcial do fenol em resinas fenólicas, visando à obtenção de adesivos para madeira [4] , de moldados [5], [6] e de espumas fenólicas [7] .…”