Morphology and mechanical properties of impact modified polypropylene blends

Tortorella, Nathan; Beatty, C. L.

doi:10.1002/pen.21089

Cited by 26 publications

(21 citation statements)

References 74 publications

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“…1,2 Isotactic polypropylene (iPP) is the most important semicrystalline polymer commodities and is widely used as a matrix component in automotive parts, appliances and other industrial uses. 3,12 There is considerable interest to simultaneously improve both the stiffness and toughness of semi-crystalline polymers. However, the poor impact strength of iPP at low temperature limits its applications.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of nanoprotrusion surface structured silica nanofibers for the improvement of the toughening of polypropylene

et al. 2015

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The toughening of semi-crystalline polymers with inorganic nanofiller is very important in the practical applications of such polymers. In this study, we successfully fabricated the surface attaching silica nanoparticles of silica nanofibers (SiO 2 @SNFs) from the calcination of electrospun poly(vinyl pyrrolidone)/tetraethyl orthosilicate/silica nanoparticle (PVP/TEOS/SiO 2 ) nanofibers for the toughening of polypropylene (PP). The SiO 2 @SNFs had a nanoprotrusion structured surface, and the degree of surface nanoprotrusion of the silica nanofibers (SNF) can be adjusted via the incorporated SiO 2 nanoparticle content of the SiO 2 @SNFs. The effects of the SiO 2 content of the SiO 2 @SNFs on the crystallization behavior, relative b-form crystal content, and mechanical properties of PP were investigated with polarized optical microscopy, X-ray diffraction and notched Izod impact test methods. By comparison with SNF, the SiO 2 @SNFs showed greater improvements in the impact strength and heterogeneous crystal nucleation of PP at the same loading content of filler. The impact strength of PP/SiO 2 @SNFs at a loading of 2 wt% of SiO 2 @SNFs with 9 phr (SiO 2 /TEOS ¼ 9/100) of SiO 2 nanoparticles was improved by about 1.9 and 1.4 times that of neat PP and PP/SNFs composite (2 wt% of SNFs), respectively. However, the crystallinity, relative b-form crystal content, and tensile strength of PP/SiO 2 @SNFs were almost independent of the SiO 2 nanoparticle content of the SiO 2 @SNFs. Our results demonstrated that these nanoprotrusion surface structured silica nanofibers can be used as a novel nanofiller for improving the toughening of PP.

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Section: Introductionmentioning

confidence: 99%

Fabrication of nanoprotrusion surface structured silica nanofibers for the improvement of the toughening of polypropylene

et al. 2015

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“…It can be seen from Fig. d that the sizes of the micropores ranged between 0.1 and 1 μm, indicating a good dispersion of the grafted copolymer in PP matrix .…”

Section: Resultsmentioning

confidence: 90%

Preparation of toughened polypropylene‐g‐poly(butyl acrylate‐co‐acrylated castor oil) by suspension grafting polymerization

Zhao

Wang

Zhang

et al. 2017

Polymer Engineering & Sci

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Butyl acrylate (BA) with acrylated castor oil (ACO) was grafted onto porous polypropylene (PP) granules by grafting polymerization. Crosslinked copolymer microdomains which functioned as rubber phase to improve the toughness of PP were filled into the pores of PP granules. The sizes of crosslinked copolymer microdomains were controlled in the range of 0.1-1 lm in PP matrix. The results of fourier transform infrared spectroscopy and scanning electron microscope of PP-g-(BA-co-ACO) after extracted by acetone confirmed that BA and ACO were grafted onto PP successfully. The effects of comonomer ratio, initiator content and comonomer content on grafting percentage (GP) and grafting efficiency (GE) were investigated. The GP of PP-g-(BA-co-ACO) could be up to 21.3% with the comonomer content increasing to 25%. The crosslinked copolymer decreased the melting flow index and the relative crystallinity of PP. Dynamic mechanical thermal analysis showed that the glass transition temperature of PP decreased slightly from 228C to 158C. The addition of 5% comonomer content led to an increase of notched impact strength from 1.96 to 3.81 kJ/m 2 (nearly doubled) and a marginal decrease in the tensile strength of PP. Then with further addition of comonomer, the notched impact strength increased to 8.98 kJ/m 2 while the tensile strength was 29.37 MPa. POLYM. ENG. SCI., 58:86-93, 2018.

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“…In this study, the extent of grafting was estimated by analyzing FTIR spectra of hot pressed thin films using a calibration curve . The calibration curve obtained by calculating the ratio RI = A (1735) / A (2722) of different blends obtained by melt mixing of PP and MMA‐co‐ n ‐BA, where A 1735 belongs to IR absorbance peak area of the stretch vibrations of CO group at 1735, and A 2722 belong to the area of the peak at 2722 cm −1 which belongs to CH group of PP, respectively,.…”

Section: Methodsmentioning

confidence: 99%

Rheology and morphology of polypropylenein situgrafted and blended with methyl methacrylate/n-buthylacrylate copolymer

Jahani

Hosseini

Goudarzian

2014

J Vinyl Addit Technol

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The rheology and morphology of polypropylene (PP) modified by grafting and blending with vinyl monomers were studied in this work. The PP powder was impregnated by mixture of methyl methacrylate (MMA)/n‐buthylacrylate (n‐BA) and copolymerized with azobisisobutyronitrile (AIBN) initiator. The simultaneous grafting and blending of PP with MMA‐co‐n‐BA copolymers were performed in a corotating, 40 L/D, twin‐screw extruder in the presence of dicumyl peroxide. The Fourier transform infrared spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) were used to verify the grafting level and dispersion state of MMA/n‐BA copolymer on PP matrix, respectively, and their rheological properties were studied. It is observed that MMA/n‐BA copolymer is finely dispersed in the PP matrix. In this way, PP can be grafted, blended, and simultaneously compatibilized with polar copolymers, as is seen in SEM images. The results showed that by increasing acrylate monomers grafting on to PP increased. The same trend was observed for AIBN initiator. The gel content of samples with 25% monomers showed an increased from 0.7% to 3.5% by increasing AIBN from 0.2% to 0.4%. The grafting reaction took place with chain scission of PP molecules and also cross‐linking reactions. The optimum grafting of 7.3% with lowest chain scission and cross‐linking were obtained for samples containing 15 wt% monomer and 0.3% AIBN initiator. J. VINYL ADDIT. TECHNOL., 21:290–298, 2015. © 2014 Society of Plastics Engineers

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Morphology and mechanical properties of impact modified polypropylene blends

Cited by 26 publications

References 74 publications

Fabrication of nanoprotrusion surface structured silica nanofibers for the improvement of the toughening of polypropylene

Fabrication of nanoprotrusion surface structured silica nanofibers for the improvement of the toughening of polypropylene

Preparation of toughened polypropylene‐g‐poly(butyl acrylate‐co‐acrylated castor oil) by suspension grafting polymerization

Rheology and morphology of polypropylenein situgrafted and blended with methyl methacrylate/n-buthylacrylate copolymer

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