Photodegradation of thermodegraded polypropylene/high-impact polystyrene blends: Mechanical properties

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dc.contributor.authorFernandes L.L.
dc.contributor.authorFreitas C.A.
dc.contributor.authorDemarquette N.R.
dc.contributor.authorFechine G.J.M.
dc.date.accessioned2024-03-13T01:11:29Z
dc.date.available2024-03-13T01:11:29Z
dc.date.issued2011
dc.description.abstractThe influence of the addition of high-impact polystyrene (HIPS) on polypropylene (PP) photodegradation was studied with blends obtained by extrusion with and without styrene-butadiene-styrene (SBS) copolymer (10 wt % with respect to the dispersed phase). The concentrations of HIPS ranged from 10 to 30 wt %. The blends and pure materials were exposed for periods of up to 15 weeks of UV irradiation; their mechanical properties (tensile and impact), fracture surface, and melt flow indices were monitored. After 3 weeks of UV exposure, all of the materials presented mechanical properties of the same order of magnitude. However, for times of exposure greater than 3 weeks, an increasing concentration of HIPS resulted in a better photostability of PP. These results were explained in light of morphological observations. This increase of photostability was even greater when SBS was added to the blends. It was more difficult to measure the melt flow index of the binary PP/HIPS blends than that of PP for low concentrations of HIPS; this was most likely due to energy transfer between the blend domains during photodegradation. This phenomenon was not observed for the ternary blends. © 2010 Wiley Periodicals, Inc.
dc.description.firstpage770
dc.description.issuenumber2
dc.description.lastpage779
dc.description.volume120
dc.identifier.doi10.1002/app.33096
dc.identifier.issn0021-8995
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/36999
dc.relation.ispartofJournal of Applied Polymer Science
dc.rightsAcesso Restrito
dc.subject.otherlanguageblends
dc.subject.otherlanguagedegradation
dc.subject.otherlanguagepolyolefins
dc.titlePhotodegradation of thermodegraded polypropylene/high-impact polystyrene blends: Mechanical properties
dc.typeArtigo
local.scopus.citations17
local.scopus.eid2-s2.0-78650921485
local.scopus.subjectblends
local.scopus.subjectDispersed phase
local.scopus.subjectFracture surfaces
local.scopus.subjectHigh-impact polystyrene
local.scopus.subjectLow concentrations
local.scopus.subjectMelt flow index
local.scopus.subjectMorphological observations
local.scopus.subjectOrder of magnitude
local.scopus.subjectPhoto-stability
local.scopus.subjectPolystyrene blends
local.scopus.subjectPure materials
local.scopus.subjectStyrene butadiene styrenes
local.scopus.subjectTernary blends
local.scopus.subjectUV exposure
local.scopus.subjectUV irradiation
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78650921485&origin=inward
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