Abstract
Presently, researches regarding green chemistry are conducted due to its significance for the mitigation of environmental problems, particularly those related to carbon dioxide emissions in relation to global warming and the usage of fossil feedstocks not only for energy generation but also for materials production. The study examines the impact of bio-products such as corn starch, rapeseed glycerin as well as petroleum based propylene glycol as bifunctional and trifunctional chain extenders on physical-mechanical properties of polyurethane foam from rapeseed oil polyol derived via chemo-enzymatic route. The obtained foams were characterized using European and international methodologies for determination of density, compressive strength perpendicular and parallel to foaming directions, thermal conductivity, long-term water absorption after 28 days of immersion, closed cell content and cell size. Foams containing (5–25) pphp of corn starch display significantly lower values in density and compressive strength as well as cell size compared to the neat polyurethane foam. The greatest compressive strength and the lowest thermal conductivity are obtained for foams with 25 pphp of rapeseed glycerin. All foams extended with bio-products and propylene glycol are characterized by the higher long-term water absorption compared to that of the neat polyurethane foam.
Highlights
The concept of sustainable development as the development satisfying current demands of the society while not reducing the opportunities for further generations to fulfill their, was defined in 1987 by World Commission on Environment and Development (WCED 1987)
The purpose of this article is to investigate the effect of propylene glycol (PRG), rapeseed glycerine (GL) and corn starch (ST) on physical and mechanical properties of PU foams from rapeseed polyol obtained via chemo-enzymatic route
It can be observed that PU/PRG-5 foam has highly reduced density and compressive strength in all foaming directions comparing to the neat PU foam
Summary
The concept of sustainable development as the development satisfying current demands of the society while not reducing the opportunities for further generations to fulfill their, was defined in 1987 by World Commission on Environment and Development (WCED 1987). The main challenges for Green chemistry are to promote innovative chemistry technologies reducing the use and emission of hazardous materials during the design, modelling, manufacture or the use of chemical material, to develop and accept engineering decisions which reduce the consumption of energy, to reduce the use of resources and accumulation of wastes by implementing an effective catalysis processes and increasing the atom economy, as well as to use renewable resources and sub products obtainable from other, not limited areas. The use of renewable resources for the synthesis of chemical materials reduces the negative impact on environment, e.g. the use of limited resources and emis-. Such resources open up opportunities for full or partial replacement of polymers from petroleum products which may compete or even surpass traditional materials on the basis of price, quality and impact on the environment (Belgacem, Gandini 2008; Alagi et al 2016)
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