20.500.12556/RUL-148211 The signifcance of sample preparation of historical and contemporary poly(vinyl chloride) objects to investigate the distribution and changes of molar mass by SEC-MALS-dRI The distribution of molar mass of historical and contemporary poly(vinyl chloride) objects was determined using size exclusion chromatography with multi-angle light scattering detection. The weight average molar mass was determined for a collection of 57 samples, ranging from 75 to 186 kg/mol with a median of 102 kg/mol. Rigid PVC objects were found to have a signifcantly lower weight average molar mass ($M_w$ =81 kg/mol) than plasticized ones ($M_w$ =102 kg/mol). Thin objects also exhibited signifcantly lower $M_w$ than bulky objects. A substantial presence of aggregates was noted and characterized as an‘aggregate ratio’ for the entire collection. Heating a solution of poly(vinyl chloride) in THF at 55 °C for 5 h proved successful in the dissociation of the aggregates and allowed for an accurate determination of molar mass. The uncertainty of the $M_w$ determination was statistically evaluated and used to study the efects of accelerated degradation on $M_w$. No statistically signifcant changes in Mw were observed in samples artifcially aged at 50 °C to 80 °C for up to 15 weeks, indicating that $M_w$ does not decrease during degradation of a PVC heritage object and that accelerated degradation does not lead to polymer crosslinking. aggregates association size-exclusion chromatography gel-permeation chromatography PVC heritage collection heritage science agregati asociacija velikostno izključitvena kromatografija PVC zbirke dediščine dediščinska znanost true false true Angleški jezik Slovenski jezik Članek v reviji 2023-08-02 10:14:49 2023-08-02 10:14:55 2023-08-10 10:45:07 0000-00-00 00:00:00 2023 0 0 12 str. Vol. 11, art. 155 28 Jul. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2023-07-28 543.54:678.743.2:7.025 2050-7445 10.1186/s40494-023-01003-5 160389891 https://heritagesciencejournal.springeropen.com/articles/10.1186/s40494-023-01003-5 1 b8c1aaa4-310c-11ee-aeaf-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172235 s40494-023-01003-5.pdf s40494-023-01003-5.pdf 1 0404B2B701217FF0035472C2E33403E8 b2e9cf4f1c5c43c0fd047e2536790e07a6f71c5dc1820e2a813176f9e49a5ba3 7e00ccd5-310f-11ee-aeaf-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172238 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0