Lignin is a promising renewable resource and is considered an alternative raw material for the synthesis of sustainable polymers and chemicals. In particular, the development of lignin-based rigid polyurethane (PU) foams is favored by the presence hydroxyls group and aromatic rings in its structure. However, the low reactivity of aromatic hydroxyls and reduced solubility in vegetal oils require a previous modification of lignins structure, in order to synthesize rigid foams with suitable properties such as thermal conductivity, distribution/cell size, and mechanical behaviors. This work aims to develop rigid PU foams from kraft lignin (KL), combined with modified castor oil as chain extender, for a biobased polyols synthesis. Technical kraft lignin (Suzano Papel e Celulose, Brazil) was oxypropilated; propylene oxide was used as reagent to obtain oxypropilated lignin (OKL). In addition, castor oil (CO) was transesterified using glycerol to obtain modifed castor oil (MCO). OKL and MCO were charaterized by Fourier-transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC) and hydroxyl value determination. Afterward, OKL and MCO were machanically mixed in different ratios and reacted with MDI, forming rigid PU foams. Rigid PU foam containing up to 50 wt% of OKL was obtained. The results show that oxypropilation improved reactivity and solubility in modified castor oil.

Development of rigid poliurethane foam from kraft lignin and renewable chain extender: Thermal insulation application

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.