By Teresa McPherson
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Com Table 1. Composition, Glass Transition Temperature (Tg) and Number Average Molecular Weight (Mn) for Biomass Macromonomers Composition* Tg(°C) Mn L-L6 -26 562 L-L8 -20 706 D,L-L8 -21 706 L-L12 -8 994 L-L8C3 -33 1048 D,L-L8C3 -29 1048 L-L10C5 -26 1420 D,L-L10C5 -28 1420 L-L10C10 -52 1990 D,L-L10C10 -52 1990 *The macromonomer composition, L-L6, D-L6 and D,L-L6 denotes six repeat units of L- and D-lactic acid and a racemic mixture, respectively. Similarly, L8C4 denotes eight repeat units of lactic acid and four repeat units of -caprolactone.
10 acrylated PLA macromonomers (MMs) were prepared with the aim of developing biorenewable PSA polymers by copolymerization of biomass MMs with suitable acrylic monomers (see Figure 1). The addition of a few repeat units of lactic acid in the MM (from 6-12 repeat units) caused a significant increase in the glass-transition temperature (Tg) and a change from a viscous liquid to a waxy solid for 12 repeat units. Although L6 was miscible with acrylic monomers, a homogeneous mixture of L8 and monomers could only be obtained upon moderate heating and sonication.
4 A significant portion of this PSA ends its lifecycle in landfills. The introduction of biomass as a substitute for petroleumbased raw materials will make a significant contribution in the development of sustainable products, particularly when these materials can be made biodegradable. November 2011 high shear forces. The absence of mass transport results in faster reaction rates and enables the use of high molar mass components. 7,8 Miniemulsions are formed via ultrasonication, which is popular for small laboratory-scale use, but a number of mechanical methods are possible for larger scale production.
Adhesives & Sealants Industry November 2011 by Teresa McPherson
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