caa a22 4500 463192079 CHVBK 20180406164912.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10973-006-8152-7 doi (NATIONALLICENCE)springer-10.1007/s10973-006-8152-7 Howell Bob Center for Applications in Polymer Science, Central Michigan University, 48859-0001, Mt. Pleasant, MI, USA aut The utilization of TG/GC/MS in the establishment of the mechanism of poly(styrene) degradation [Elektronische Daten] [Bob Howell] General purpose poly(styrene) is a large volume commodity polymer used in a variety of applications. It is widely used in food packaging, particularly for baked goods. In this application, the presence of styrene monomer, which has a distinctive taste and aroma, cannot be tolerated. Processing of the polymer and forming of the food container at an unacceptably high temperature leads to the formation of styrene monomer and finished articles with unacceptable aroma characteristics. An examination of the thermal degradation of poly(styrene) has revealed the origin of monomer formation. The thermal decomposition of poly(styrene) has been widely studied. However, most studies have been carried out at high temperature (>300°C) where many processes are occurring simultaneously. Degradation at lower temperature, 280°C, occurs in two well-defined steps. The first is thermolysis of a head-to-head bond present in the mainchain as a consequence of polymerization termination by radical coupling. This generates macroradicals which smoothly depolymerize to expel styrene monomer. The nature of the degradation is readily apparent from kinetic analysis of the isothermal thermogravimetry (TG) data and the identity of the single volatile product may be readily established by gas chromatography/mass spectrometry (GC/MS) analysis of the effluent from the TG analysis. Springer Science+Business Media LLC, 2007 defect structures nationallicence degradation mechanism nationallicence fully head-to-tail poly(styrene) nationallicence poly(styrene) degradation nationallicence poly(styrene) microstructure nationallicence thermal stability nationallicence Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/2(2007-08-01), 393-398 1388-6150 89:2<393 2007 89 10973 https://doi.org/10.1007/s10973-006-8152-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-8152-7 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Howell Bob Center for Applications in Polymer Science, Central Michigan University, 48859-0001, Mt. Pleasant, MI, USA aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/2(2007-08-01), 393-398 1388-6150 89:2<393 2007 89 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer