Pariwat Nasuwan. Impact modification of poly (methyl methacrylate) scrap recycle in the styrene-methyl methacrylate copolymer cast sheet by using butadiene rubber. Master's Degree(Appropriate Technology for Resources and Environmental Development). Mahidol University. : Mahidol University, 2008.
Impact modification of poly (methyl methacrylate) scrap recycle in the styrene-methyl methacrylate copolymer cast sheet by using butadiene rubber
Abstract:
This research presents the impact modification of poly(methyl methacrylate) scrap
recycle in the styrene-methyl methacrylate copolymer cast sheet by using butadiene rubber via
bulk polymerization and casting technique method. The influence of, concentrations of
poly(methyl methacrylate) scrap and butadiene rubber on the preparation of the styrene-methyl
methacrylate copolymer cast sheet was studied. The mechanical properties examined were
consisted of hardness, impact strength and tensile properties, and the physical properties
examined were consisted of ultraviolet resistance, heat resistance and opacity.
The results show that increasing of poly(methyl methacrylate) scrap concentrations
cause on increase in hardness and tensile strength at yield, but impact strength and elongation
at break decreased. Increasing butadiene rubber concentration causes hardness and tensile
strength at yield to decrease, but causes impact strength and elongation at break to increase.
However, the increasing concentration of poly(methyl methacrylate) scrap and butadiene
rubber leads to a decrease in ultraviolet resistance and heat resistance, with no affect on opacity
property. Therefore, the appropriate ratio for impact modification of poly(methyl methacrylate)
scrap recycle in the styrene-methyl methacrylate copolymer cast sheet by using butadiene
rubber is poly(methyl methacrylate) scrap 3%, butadiene rubber 2.0 phr, which gave the
hardness value D/86.20±0.42/10, impact strength 42.58±0.29 kJ/m2, tensile strength at yield
2.83±0.19 kgf/mm2, elongation at break 4.47±0.3%, the yellowness shifts from the ultraviolet
resistance 3.97±0.02 and heat resistance 3.50±0.02. Opacity is 13.97±0.03%.
Finally, the environmental impact and economics from the recycling of poly(methyl
methacrylate) scrap were evaluated using the Life Cycle Inventory (LCI) data of the
poly(methyl methacrylate) cast sheet production process. The results show that the recycling of
poly(methyl methacrylate) scrap can decrease methyl methacrylate monomer 778.05 T/yr and
energy 4,519415.01 MJ/yr. It can also decrease greenhouse gases (GHGs) emissions,
consistence of 432.06 kg in CO2-eq., 5.92 kg in N2O-eq., 1,279.17 kg in NOx-eq., 41.45 kg in
CH4-eq., and 626.99 kg in CO-eq.