caa a22 4500 463231457 CHVBK 20180405153243.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10853-007-1990-2 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1990-2 Impact of hygrothermal aging on the dynamic mechanical properties of Sheet Molding Compound [Elektronische Daten] [Ryan Mills, Douglas Gardner, Adriaan van Heiningen] Sheet Molding Compound, (SMC), is a composite material comprised of an unsaturated crosslinked polymer, reinforcing fiber such as glass, thermoplastic processing aids, mineral fillers, and lubricant (release agent). Mechanical properties for service requirements are developed through fiber reinforcements randomly aligned in between two polymer sheets. Service requirements for the SMC material are necessary for specified amounts of time. For example, SMC used for automotive parts have upwards of a 10year service life; therefore, the study of how the SMC material changes with time and environmental exposure is of interest. In the current study, hygrothermal aging is used to accelerate normal environmental aging and dynamic mechanical thermal analysis (DMTA) is used to study the mechanical and chemical changes as a function of temperature and aging time. Results from the current study show through high performance liquid chromatography (HPLC) analysis that poly(vinyl acetate) (PVAc) does not chemically react with water in the SMC material and DMTA data show that water has two roles in the thickening reaction in the SMC between MgO and carboxylic acid functional groups adding an additional step to what has been previously reported. Springer Science+Business Media, LLC, 2007 Mills Ryan School of Forest Resources, and Advanced Engineered Wood Composites Center, University of Maine, 04469, Orono, ME, USA aut Gardner Douglas School of Forest Resources, and Advanced Engineered Wood Composites Center, University of Maine, 04469, Orono, ME, USA aut van Heiningen Adriaan Department of Chemical Engineering, University of Maine, 04469, Orono, ME, USA aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/23(2007-12-01), 9822-9826 0022-2461 42:23<9822 2007 42 10853 https://doi.org/10.1007/s10853-007-1990-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1990-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mills Ryan School of Forest Resources, and Advanced Engineered Wood Composites Center, University of Maine, 04469, Orono, ME, USA aut NATIONALLICENCE 700 1- Gardner Douglas School of Forest Resources, and Advanced Engineered Wood Composites Center, University of Maine, 04469, Orono, ME, USA aut NATIONALLICENCE 700 1- van Heiningen Adriaan Department of Chemical Engineering, University of Maine, 04469, Orono, ME, USA aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/23(2007-12-01), 9822-9826 0022-2461 42:23<9822 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer