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[{"key": "dc.contributor.advisor", "value": "Al\u00e9n, Raimo", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Nikala, Antti", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2017-05-18T12:39:12Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2017-05-18T12:39:12Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2017", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1702051", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/54031", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Muovien k\u00e4ytt\u00f6 on lis\u00e4\u00e4ntynyt runsaasti viimeisten vuosikymmenten ajan valmistus- ja ty\u00f6st\u00f6prosessien sek\u00e4 lis\u00e4aineiden kehityksen my\u00f6t\u00e4. Nykyaikaisten korkealaatuisten muovituotteiden valmistuksessa k\u00e4ytet\u00e4\u00e4n lukuisia erilaisia lis\u00e4aineita, joiden avulla pystyt\u00e4\u00e4n vaikuttamaan esimerkiksi muovien pintaominaisuuksiin sek\u00e4 pident\u00e4m\u00e4\u00e4n niiden k\u00e4ytt\u00f6ik\u00e4\u00e4. K\u00e4ytt\u00f6ik\u00e4\u00e4n vaikuttavat oleellisesti hapen aiheuttamat reaktiot polymeerirakenteessa ja n\u00e4iden ei-haluttujen reaktioiden rajoittamiseksi on kehitetty erilaisia stabilointiaineita, kuten antioksidantteja.\n\nMuovien sis\u00e4lt\u00e4m\u00e4t lukuisat lis\u00e4aineet voivat reagoida kesken\u00e4\u00e4n aiheuttaen synergisi\u00e4 tai antagonisia vaikutuksia, jolloin tiettyjen lis\u00e4aineiden teho voi kasvaa tai heikenty\u00e4. Samoin ne voivat aiheuttaa erilaisia haju- ja makuvaikutuksia. Osa lis\u00e4aineista on my\u00f6s helposti kulkeutuvia, jolloin ne voivat siirty\u00e4 esimerkiksi elintarvikepakkauksesta elintarvikkeeseen. T\u00e4m\u00e4 taas aiheuttaa aiheellisia kysymyksi\u00e4 yhdisteiden terveysvaikutuksista ja lis\u00e4aineisiin sek\u00e4 niiden kulkeutumiseen liittyv\u00e4 lains\u00e4\u00e4d\u00e4nt\u00f6 onkin kiristynyt viime vuosina.\n\nOpinn\u00e4ytety\u00f6n kokeellisessa osassa kehitettiin menetelm\u00e4 polymeerien sis\u00e4lt\u00e4mien antioksidanttien ja niiden hajoamistuotteiden m\u00e4\u00e4ritt\u00e4miseen. Erottamismenetelmin\u00e4 k\u00e4ytettiin Soxhlet- ja ultra\u00e4\u00e4niuuttoja sek\u00e4 detektointiin massaspektrometrill\u00e4 varustettua neste-kromatografia. Lis\u00e4ksi kehitetyll\u00e4 menetelm\u00e4ll\u00e4 tutkittiin er\u00e4it\u00e4 polyeteeni- ja polyetyleeni-tereftalaattimuovilaatuja.\n\nSoxhlet- ja ultra\u00e4\u00e4niuuttoja vertailtaessa ultra\u00e4\u00e4niuutto havaittiin hieman paremmaksi erotusmenetelm\u00e4ksi ja dikloorimetaani 2-propanolia paremmaksi uuttoliuottimeksi. Tutkituissa muovilaaduissa ei havaittu tutkittavia yhdisteit\u00e4 tai niiden pitoisuudet olivat liian pienet luotettavan tuloksen toteamiseksi. Tulosten tulkintaa vaikeuttivat my\u00f6s lukuisat kontaminaatio-l\u00e4hteet, joiden vaikutusta tuloksiin ei voitu kokonaan est\u00e4\u00e4.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Antti Nikala (anyrnika) on 2017-05-18 12:39:11.672623. Form: Pro gradu -lomake (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake). JyX data: [jyx_publishing-allowed (fi) =True]", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija.group@korppi.jyu.fi) on 2017-05-18T12:39:12Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201705182412.pdf: 2626616 bytes, checksum: 054cfbfd64d47509e175e9434aa63b82 (MD5)\nlicense.html: 4840 bytes, checksum: 6708415360e2bfa46bb506bb40edf652 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2017-05-18T12:39:12Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201705182412.pdf: 2626616 bytes, checksum: 054cfbfd64d47509e175e9434aa63b82 (MD5)\nlicense.html: 4840 bytes, checksum: 6708415360e2bfa46bb506bb40edf652 (MD5)\n Previous issue date: 2017", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (111 sivua)", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "muovit", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "polymeerit", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "antioksidantit", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Polymeerien lis\u00e4aineet ja lis\u00e4aineantioksidanttien kemialliset m\u00e4\u00e4ritysmenetelm\u00e4t", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201705182412", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": 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