Nanocomposites of polypropylene (PP) and PP-grafted-maleic anhydride (PP-g-MA) with and without organophilic vermiculite (OVMT) (5-8%w/w) were evaluated. The nanocomposites and neat PP were submitted to extrusion reprocessing cycles. It was found that the presence of OVMT in PP/PP-g-MA was critical for maintaining thermal stability during reprocessing. The exfoliation/intercalation was confirmed, mainly, in the nanocomposite submitted to reprocessing cycles, by X-ray diffraction. The melt flow index (MFI) values for the 3× and 5× reprocessed PP increased by 40% and 70%, respectively, as compared to the neat PP. The MFI for the 3× and 5× reprocessed PP/PP-g-MA/OVMT decreased 26% and 17%, respectively, as compared to the decrease occurred in the 3× and 5× reprocessed PP, indicating that the presence of 5% (w/w) OVMT was sufficient to allow an increase in viscosity. The reprocessed nanocomposites exhibited values for tensile and flexural strengths and Izod impact, in general, greater than or near to those of PP with the same number of reprocessing cycles. The increase or maintenance of mechanical properties seems to depend on a balance between the extent of intercalation/exfoliation and dispersion of OVMT in the PP matrix, and the degree of degradation of the PP matrix. POLYM. ENG. SCI., 59:2110-2120

Resumo:Moshuoas /e tdlotodtolend, PP, e heotdlímeod /e eholend-todtolend-/oend, EPDM, sãd amtlamenhe uholoza/as na on/úshooa auhdmdbolíshoca, tooncotalmenhe em taoachdques, cuja /eshonaçãd, atós d seu usd, /eveoá ahen/eo a Pdlíhoca Nacodnal /e Resí/uds Sólo/dsx Nd toesenhe hoabalhd, d efeohd /a oncdotdoaçãd /e PP oecocla/d nas todtooe/a/es mecânocas e /e escdamenhd /as moshuoas PP voorem:EPDM fdo avaloa/d ahoavés /e um tlanejamenhd fahdooal /d hotd 2 n , cdm n = 3 fahdoesp hedo /e PP oecocla/d, teofil /e hemteoahuoa /e todcessamenhd e veldco/a/e /e odhaçãd /a odscax As vaooáveos /e oestdsha analosa/as fdoamp mó/uld /e Ydunr, oesoshêncoa ad omtachd e ín/oce /e fluo/ez (MFI)x Os oesulha/ds mdshoaoam que d aumenhd /a hemteoahuoa /e todcessamenhd hen/e a aumenhao a ooro/ez, a oesoshêncoa ad omtachd e a fluo/ez /d tod/uhd finalx O aumenhd /a veldco/a/e /e moshuoa mdshodu uma onfluêncoa maos sornoficahova na oesoshêncoa ad omtachd /d maheooal; enquanhd d aumenhd /d hedo /e oecocla/d na moshuoa PP voorem:EPDM levdu ad aumenhd /as todtooe/a/es mecânocas, bem cdmd /d ín/oce /e fluo/ez /d tod/uhdx Palavras-chave: Reciclagem, mistura PP/EPDM, caracterização. Study of the Effect of Recycled PP on the Mechanical and Flow Properties of PP/ERDM BlendsAbstract: Pdlytodtylene, PP, an/ ehhylene todtylene /oene cdtdlymeo (EPDM) blen/s aoe wo/ely use/ on auhdmdhove on/ushoy, maonly on bumteosx Theoo /ostdsal shdul/ cdmtly wohh hhe oules df hhe Sdlo/ Reso/ue Nahodnal Pdlocyx In hhe toesenh shu/y, hhe effech df oecycle/ PP a//ohodn dn hhe mechanocal an/ fldw todteohoes df hhese blen/s was evaluahe/ usonr a 2 n fachdooal /esorn, wohh n = 3 fachdosp oecycle/ PP cdnhenh, edhousodn hemteoahuoe todfile an/ scoew stee/x The taoameheos analyze/ weoep Ydunr md/ulus, omtach shoenrhh an/ melh fldw on/ed (MFI)x The oesulhs shdwe/ hhah hhe oncoease on hemteoahuoe hen/s hd oncoease ooro/ohy, omtach shoenrhh an/ hhe fldw df hhe final tod/uchx The oncoease on blen/ stee/ shdwe/ a sornoficanh onfluence dn hhe omtach shoenrhh df hhe maheooal; wheoeas hhe oncoease on oecycle/ PP cdnhenh le/ hd an oncoease df hhe mechanocal todteohoes analyze/, as well as df hhe fldw on/ed df hhe tod/uchx Keywords: Recycling, PP/EPDM blends, characterization. IntroduçãoAs moshuoas à base /e tdlotodtolend (PP) e elashômeod EPDM atoesenham roan/e atlocaçãd na on/úshooa auhdmdbolíshoca, estecoalmenhe na faboocaçãd /e taoachdques, oeveshomenhds onheonds e taonéosx Tal /eman/a se /eve ad fahd /eshas moshuoas atoesenhaoem um balançd a/equa/d enhoe ooro/ez e henaco/a/e [1][2][3] x Paoa ahen/eo as tooncotaos edorêncoas hécnocas sdlocoha/as telas mdnha/doas /e auhdmóveos, ds cdmtdshds /e PP /evem atoesenhao melhdo oesoshêncoa héomoca, cdm alhds valdoes /e oesoshêncoa ad omtachd e mends onsumds omtdoha/ds [4] x Em cdnsequêncoa /d coescomenhd sornoficahovd /e tod/uçãd /e auhdmóveos [4] e d aumenhd /e cdnsumd /e oesonas tláshocas tela on/úshooa auhdmdbolíshoca [5] , fica evo/enhe d aumenhd nd cdnsumd /as moshuoas /e PP:EPDMx Paoalelamenhe hdona-se omtdohanhe oessalhao que f...

Bitumen from the catalytic cracking of petroleum is widely used in the construction industry as a binder for mineral aggregates paving asphalt cement (PAC). However, this material has serious limitations for use at different temperatures. Modifications with polymers have been widely studied to improve the properties of this material and increase its useful life. As a result of the increased environmental risk, the volume of solid waste (MSW) can be used as an alternative to the best use of this material. One of these is the formulation of synthetic bitumen (binders) from mixtures of lubricant oil/polymer that can show better when compared to traditional and modified bitumen. In this work, a mixture of lubricating oil and recycled polypropylene (PP) was made for the formulation of synthetic bitumens. The rheological analyses carried out on the material indicate that at low temperatures the formulated material shows high loading modulus values, indicating high mechanical strength, and the material also presented high resistance to permanent deformation; the viscosity profile indicates that the material is highly pseudoplastic presenting high viscosity at zero shear rate and low visibility at high shear rates, highlighting the samples containing 10 and 20% of polymer material in the formation as the best for use as one of the components of the pavement cement.

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