Effects of processing on the microstructure, melting behavior, and equilibrium melting temperature of polypropylene

Tiganis, B. E.; Shanks, Robert A.; Long, Yu

doi:10.1002/(sici)1097-4628(19960124)59:4<663::aid-app12>3.3.co;2-c

Cited by 7 publications

(9 citation statements)

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“…However, phase separation was clearly observed in all nontreated blends where PP and PET could be easily differentiated in Figures 7(A), 8(A), 9(A), and 10(A). The spherically shaped beads belonged to PET where the main matrix is PP in the nontreated blends, as was observed in many previous studies 2–6, 14–16. Spherical voids and holes were clearly observed in nontreated blends due to the pullout of these weakly interacted polymers from the main matrix (PP) after tensile testing.…”

Section: Resultssupporting

confidence: 73%

Melt blending of poly(ethylene terephthalate) with polypropylene in the presence of silane coupling agent

Oyman¹,

Ti̇nçer²

2003

J of Applied Polymer Sci

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A silane coupling agent (SCA) was used as a compatibilizer for polypropylene-poly(ethylene teraphthalate) (PP-PET) blends with 20, 40, 50, and 60% PET compositions by weight. PP-PET mixtures were blended with and without an SCA by a single-screw extruder. The effect of silane modification on the tensile and impact properties of the blends was investigated. The morphology and thermal behavior of the blends were examined with scanning electron microscopy (SEM) and differential scanning calorimetry (DSC), respectively. The presence of the SCA used in this work extensively improved the mechanical properties of the blends. Mechanical properties were found to be highly dependent on the numbers of extrusions. SEM studies showed that substantially different morphology with better adhesion existed when SCA-treated blends were compared to nontreated PP-PET blends. The presence of individual melting temperatures of the polymers in all compositions with no significant T m depression indicated that PET and PP were crystallized separately.

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Section: Resultssupporting

confidence: 73%

Melt blending of poly(ethylene terephthalate) with polypropylene in the presence of silane coupling agent

Oyman¹,

Ti̇nçer²

2003

J of Applied Polymer Sci

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“…2), demonstrated the existence of the b polymorph (plane (300) of the bmodification) in the crystalline state. In the PP composites, the filler addition can cause the nucleation of the polymorph b in isotactic polypropylene, depending on the filler concentration, the dispersion of the additives into the PP matrix and the cooling rates [16][17][18]. For the other formulations, the melting curves were similar.…”

Section: Study Of Crystalline Statementioning

confidence: 99%

Design of new polypropylene–woodflour composites: Processing and physical characterization

et al. 2008

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Woodflour/polypropylene composites were prepared with 10 and 20% in weight of woodflour (WF). The influence of the WF, the compatibilizer, and processing aid (WP) in the crystalline structure of the polypropylene was studied by thermal analysis. The results showed that the WF acts as a nucleating agent, increasing the crystallization rate of the PP at the cooling rates studied. The morphological study by SEM proved that the WP increased the dispersion of the filler into the PP matrix, and the ionomer, used like compatibilized improved the adhesion between the PP and the filler obtaining a more uniform morphology. The mechanical properties indicated that the incorporation of the ionomer and the WP enhanced the ductility of the composites at the same time that the materials reached a more uniform morphology. The amount of additives (compatibilizer and WP) included in the woodflourplastic composite (WPC) formulations was small, for this, the formulations are suitable to use in a possible industrial application.

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“…45,46 Polypropylene is mainly used in room temperature conditions, already well above its glass transition temperature 47,48 and within a region of near-constant stiffness until approaching its melting point, which is typically within the range 156 °C to 168 °C. 49,50 Cui and colleagues suggest that thermal cycling (75 °C, 30 min heating, applied over 20 cycles) does not degrade the filtration efficiency masks after heating to 160 °C for 3 min. 5 Therefore, we expect that repeated sterilization at lower temperatures will be effective without degrading masks, while also feasible within relatively short times (less than 10 min; Table 1) and achievable for the majority of humans with access to home ovens, rice cookers, or similar inexpensive heating devices.…”

Section: Discussionmentioning

confidence: 99%

A Predictive Model of the Temperature-Dependent Inactivation of Coronaviruses

Yap¹,

Liu²,

Shveda³

et al. 2020

Preprint

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The COVID-19 pandemic has stressed healthcare systems and supply lines, forcing medical doctors to risk infection by decontaminating and reusing medical personal protective equipment intended only for a single use. The uncertain future of the pandemic is compounded by a lack of data on the ability of the responsible virus, SARS-CoV-2, to survive across various climates, preventing epidemiologists from accurately modeling its spread. However, existing data on the thermal inactivation of related coronaviruses can provide insights enabling progress towards understanding and mitigating COVID-19. This paper describes a thermodynamic model that synthesizes data from the literature to accurately predict the temperature-dependent inactivation of coronaviruses. The model provides much-needed thermal sterilization guidelines for personal protective equipment, including masks, and will also allow epidemiologists to incorporate temperature into models forecasting the spread of coronaviruses across different climates and seasons.

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Effects of processing on the microstructure, melting behavior, and equilibrium melting temperature of polypropylene

Cited by 7 publications

References 0 publications

Melt blending of poly(ethylene terephthalate) with polypropylene in the presence of silane coupling agent

Melt blending of poly(ethylene terephthalate) with polypropylene in the presence of silane coupling agent

Design of new polypropylene–woodflour composites: Processing and physical characterization

A Predictive Model of the Temperature-Dependent Inactivation of Coronaviruses

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