Reactive processing of a non-additivated isotactic polypropylene: mechanical and morphological properties on molten and solid states

Echeverrigaray, Sérgio G.; Cruz, Robinson C.D.; Oliveira, Ricardo Vinícius Bof de

doi:10.1007/s00289-012-0845-4

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…The results obtained for the new membranes PP-N and PP-T are shown in Figure 12. The obtained FTIR spectra have a methyl absorption band at 1375 cm –1 and 1450 cm –1 characteristic for PP and few peaks (809, 841, 899, 972, 997.1167 and 1219 cm −1 ) attributed to the presence of iPP [64,65]. In the case of PP-N membranes, the significantly larger peaks had an intensity that was observed in the range of 1600–1800 cm −1 , which is characteristic for the carbonyl groups formed as a result of thermal oxidation [62].…”

Section: Resultsmentioning

confidence: 99%

The Influence of Talc Addition on the Performance of Polypropylene Membranes Formed by TIPS Method

Gryta

2019

Membranes

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The effect of talc addition on the morphology of capillary membranes formed by a thermally induced phase separation (TIPS) method was investigated in the presented work. The usability of such formed membranes for membrane distillation was evaluated. Two types of commercial capillary polypropylene membranes, fabricated for microfiltration process, were applied in the studies. A linear arrangement of polymer chains was obtained in the walls of membranes formed without a talc addition. In the case of membranes blended with talc, the linear structure was disordered, and a more porous structure was obtained. The changes in morphology enhanced the mechanical properties of blended membranes, and their lower thermal degradation was observed during 350 h of membrane distillation studies. Long-term studies confirmed the stability of talc dispersion in the membrane matrix. A leaching of talc from polypropylene (PP) membranes was not found during the membrane distillation (MD) process.

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Section: Resultsmentioning

confidence: 99%

The Influence of Talc Addition on the Performance of Polypropylene Membranes Formed by TIPS Method

Gryta

2019

Membranes

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“…[7] The incorporation of POSS into PP at up to 4.0 vol% did not significantly alter the PP diffractogram, with small differences being associated with different crystal alignments in the sample. [13,34] The only exception is the fact that the Bragg reflection at 16.8 (040) was not seen in the diffractogram of the sample containing 8.2 vol% POSS. The POSS peaks that appeared in the diffractograms of highly loaded PP-POSS (4.0 and 8.2 vol%) were not seen in the PP-POSS with low POSS contents (0.4-1.6 vol%).…”

Section: Phase Morphology and Crystalline Structure Of Pp-poss Matementioning

confidence: 99%

A survey of the rheological properties, phase morphology, and crystallization behavior of PP‐POSS materials with weak phase separation

Bianchi

Ornaghi

Martins

et al. 2020

Polymer Engineering & Sci

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Polypropylene (PP) compounds with varying amounts (0.4‐8.2 vol%) of tailored allyl‐isobutyl polyhedral oligomeric silsesquioxane (POSS) were prepared by melt‐blending. The dependence of the crystallization behavior and crystalline structure of PP on the melt‐state phase morphology of PP‐POSS materials is addressed. PP‐POSS systems were predicted to exhibit weak phase separation in both the molten and solid states based on Bagley plot using Hansen solubility parameters. Small‐amplitude shear rheometry analysis suggested that the highest loaded (8.2 vol%) PP‐POSS system behaves as a two‐liquid emulsion, whereas the low‐content POSS (0.4‐4.0 vol%) systems deviate from this model, resembling a polymer nanocomposite. Based on these findings we hypothesized the formation of a heterogeneous phase morphology in the molten state comprised of nano‐size “pseudo‐solid” POSS clusters and micrometer‐size “pseudo‐liquid” POSS droplets dispersed within the PP matrix, depending on the POSS content. Upon cooling, POSS droplets comingle, forming cube‐like micrometer‐sized crystal domains. The nonisothermal crystallization of PP is enhanced by the presence of POSS clusters. Small‐angle X‐ray scattering analysis revealed the formation of thinner and more heterogeneous folded chain PP lamellae in the PP‐POSS systems.

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“…No later than 31 December 2025, 50% by weight of all packaging plastic waste must be recycled. Globally, PP is the second most versatile plastic [ 10 , 11 ] and is used in the textile industry, construction, packaging, and medical and electrical appliances [ 10 , 12 , 13 , 14 , 15 ], leading to huge waste after their shelf-life has ended. In Europe, plastic waste should be recycled either by mechanical or pyrolysis recycling technologies, as an alternative to incineration and landfilling methods [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Polypropylene Waste in the Production of New Materials with Adequate Mechanical and Thermal Properties for Environmental Protection

et al. 2022

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Innovative composites based on polypropylene waste impurified cu HDPE (PPW) combined with two thermoplastic block-copolymers, namely styrene-butadiene-styrene (SBSBC) and styrene-isoprene-styrene (SISBC) block-copolymers, and up to 10 wt% nano-clay, were obtained by melt blending. SBSBC and SISBC with almost the same content of polystyrene (30 wt%) were synthesized by anionic sequential polymerization and used as compatibilizers for PPW. Optical microscopy evaluation of the PPW composites showed that the n-clay was encapsulated into the elastomer. Addition of n-clay, together with SBSBC or SISBC, increased the interphase surface of the components in the PPW composites and enhanced the superficial area/volume ratio, which led to a recycled material with improved performance. The data resulting from differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), mechanical evaluation, and dynamic mechanical analysis (DMA) revealed that PPW reinforcement with n-clay and styrene-diene block-copolymers allows the obtaining of composites with favorable mechanical and thermal properties, and excellent impact strength for potential engineering applications.

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Reactive processing of a non-additivated isotactic polypropylene: mechanical and morphological properties on molten and solid states

Cited by 8 publications

References 30 publications

The Influence of Talc Addition on the Performance of Polypropylene Membranes Formed by TIPS Method

The Influence of Talc Addition on the Performance of Polypropylene Membranes Formed by TIPS Method

A survey of the rheological properties, phase morphology, and crystallization behavior of PP‐POSS materials with weak phase separation

Valorization of Polypropylene Waste in the Production of New Materials with Adequate Mechanical and Thermal Properties for Environmental Protection

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