Long-chain branch-induced interfacial interaction and its effect on morphology development in polypropylene/ethylene octene copolymer blend

Tarashi, Sara; Nazockdast, Hossein; Javidi, Zeinab; Mehranpour, Milad

doi:10.1007/s10853-019-03341-x

Cited by 15 publications

(32 citation statements)

References 42 publications

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“…This gel-like behavior of TPS has been shown to be originated from the single helix crystalline regions and the physical entanglement of highmolecular weight polysaccharide molecules. [28][29][30][31][32][33][34] Della Valle et al reported significant differences in the rheological behavior of TPS samples with different botanical origins, which could be attributed to their molecular-scale features such as chain length and linearity, favoring the entanglement of the amorphous phase rather than strengthening the crystalline structure. [28] Gonzalez et al suggested that the variation of glycerol content did not affect the contribution of single-helix crystallinity to strengthening of elastic network of TPS, but rather merely plasticized the amorphous fraction of starch.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Effect of Citric Acid on Microstructure, Rheology, and Structural Recovery of Thermoplastic Potato Starch

2021

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The main objective of the present work is to explore the role of citric acid (CA) on microstructural changes and their impact on the melt rheological behavior, mechanical performance, and shape recovery of thermoplastic starch (TPS). The results of frequency sweep test show a pronounced nonterminal storage modulus (G’) at lower frequencies (high melt elasticity) for TPS, which is found to be greatly reduced in favor of improving the processability through the addition of CA. This could be explained in terms of reduced disentanglements of amylopectin molecules, as a crucial parameter responsible for the 3D‐type interconnected microstructure of TPS, through catalyzing effect of CA on hydrolysis. The results of the temperature sweep test (cooling mode) show a pronounced liquid‐to‐solid transition at ∼136℃ for CA‐modified TPS. This transition could be attributed to the temperature‐driven significant strengthening of the formation of single helical amylose crystalline structure and/or the hydrogen bonds between hydrolyzed amylopectin chains at temperatures below 136℃. The results are found to be consistent with the results obtained from the tensile and DMTA experiments. As expected, the shape recovery of the CA‐modified TPS sample is lower than that of unmodified TPS because of the lower elastic stored energy (stiffness) in the presence of CA, which can be largely compensated by incorporating appropriate nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Unraveling the Effect of Citric Acid on Microstructure, Rheology, and Structural Recovery of Thermoplastic Potato Starch

2021

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“…However, PBAT has many terephthalic acid chain links, which is more conducive to the absorption of CO 2. 41 More concretely, under 8 MPa impregnation pressure, the CO 2 concentration in PBAT was 11.86% at 25°C, which was nearly three times higher than that of 85°C. Also, the same thing happened in the PBAT‐PLA blend system, the concentration of CO 2 in the PBAT‐PLA blend at 25°C was even four times higher than that at 85°C, that is, from 3.91% to 11.23%.…”

Section: Resultsmentioning

confidence: 90%

“…The elasticity of PBAT‐PLA had little change compared with neat PBAT in the same test condition. Complex viscosity ( η * ) can reflect the strength of the melt to some extent 41,42 . As shown in Figure 3B, PBAT and PBAT‐PLA both presented the classical shear thinning behavior with an increase of shear rate.…”

Section: Resultsmentioning

confidence: 94%

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A one‐step method to manufacture biodegradable poly (butylene adipate‐co‐terephthalate) bead foam parts

Cai

Bai

2021

Polymers for Advanced Techs

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Pollution caused by waste plastic, particularly from the foam packages, is increasingly worse, and utilizing biodegradable material is considered a promising solution to handle this environmental issue. Poly (butylene adipate‐co‐terephthalate) (PBAT) is a typical environment‐friendly polymer due to the recognized biodegradability and excellent mechanical performance. However, there have been very few works preparing PBAT bead foams via the supercritical fluid foaming technology, and the related foaming behavior is still unclear. In this study, we foamed PBAT and PBAT‐polylactide (PLA) beads using supercritical carbon dioxide (Sc‐CO2) as a foaming agent, and the foaming behaviors of beads as well as the mechanical properties of bead foam parts manufactured by one‐step foaming method were systematically investigated. The incorporation of PLA enhanced the mechanical properties of the composition. At the optimal foaming conditions, the expansion ratio and cell density of PBAT/PLA foam were 13.44 and 4.08 × 108 cells/cm3, respectively. Benefitting from the uniform cell structure, the bead foam part showed excellent resilience and elasticity with adhesive strength of 0.57 MPa and compression strength of 1.05 MPa. Meanwhile, PBAT and PBAT‐PLA foam parts had high surface quality and good interbead sintering properties. PBAT can be a promising substitute for traditional non‐polymer foams for packaging, household, and automobile fields.

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“…To date, many modification methods have been developed to improve the mechanical property of PP, mainly, including physical blending, [ 5 ] chemical crosslinking, [ 6 ] and copolymerization. [ 7 ] Among them, physical blending modification is extensively adopted to reinforce the mechanical property of PP in industrial production by virtue of its simplicity and high‐efficiency.…”

Section: Introductionmentioning

confidence: 99%

Improved mechanical performances of short aramid fiber‐reinforced polypropylene composites by Ti₃C₂ Mxene nanosheets

et al. 2021

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Fiber-reinforced polypropylene (PP) composites are widely used for structural bearing because of their excellent mechanical property. So, it is necessary to improve the mechanical property of fiber-reinforced PP composites. In this present, two-dimensional Ti 3 C 2 Mxene nanosheets were bound to short aramid fiber (SAF), forming Ti 3 C 2 nanosheets-modified SAF (Ti 3 C 2 /SAF), aiming to improve PP mechanical property. The Ti 3 C 2 nanosheets were obtained after hydrofluoric acid etching and ultrasonically delamination procedure, followed by chemically bound to the surface of H 3 PO 4 solution-treated SAF to form Ti 3 C 2 /SAF. The Ti 3 C 2 /SAF-reinforced PP (Ti 3 C 2 /SAF/PP) composites were prepared by a melt blending method. Scanning electron microscopy images showed that the Ti 3 C 2 /SAF modified with different concentration of Ti 3 C 2 nanosheets solution presented the distinct morphologies, with the 0.3 mg/ml Ti 3 C 2 /SAF formed a relatively uniform Ti 3 C 2 nanosheets coating on the SAF surface. Test results of mechanical performance indicated that the tensile and impact strength of Ti 3 C 2 /SAF/PP composites were significantly improved. Especially, the maximum tensile and impact strength of 0.3 Ti 3 C 2 /SAF/PP composite at 5 wt% reached to 37.8 MPa and 14.0 kJ/m 2 , which was increased by 11.5% (or 28.1%) in tensile strength and 12.9% (or 38.6%) in impact strength, compared with that of SAF/PP composite (or PP matrix). This can be attributed that Ti 3 C 2 nanosheets binding to SAF improved the interfacial bonding strength between SAF and PP. This work provides a promising strategy for improving the mechanical properties of fiber-reinforced PP composites.

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Long-chain branch-induced interfacial interaction and its effect on morphology development in polypropylene/ethylene octene copolymer blend

Cited by 15 publications

References 42 publications

Unraveling the Effect of Citric Acid on Microstructure, Rheology, and Structural Recovery of Thermoplastic Potato Starch

Unraveling the Effect of Citric Acid on Microstructure, Rheology, and Structural Recovery of Thermoplastic Potato Starch

A one‐step method to manufacture biodegradable poly (butylene adipate‐co‐terephthalate) bead foam parts

Improved mechanical performances of short aramid fiber‐reinforced polypropylene composites by Ti₃C₂ Mxene nanosheets

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Long-chain branch-induced interfacial interaction and its effect on morphology development in polypropylene/ethylene octene copolymer blend

Cited by 15 publications

References 42 publications

Unraveling the Effect of Citric Acid on Microstructure, Rheology, and Structural Recovery of Thermoplastic Potato Starch

Unraveling the Effect of Citric Acid on Microstructure, Rheology, and Structural Recovery of Thermoplastic Potato Starch

A one‐step method to manufacture biodegradable poly (butylene adipate‐co‐terephthalate) bead foam parts

Improved mechanical performances of short aramid fiber‐reinforced polypropylene composites by Ti3C2 Mxene nanosheets

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Product

Resources

About

Improved mechanical performances of short aramid fiber‐reinforced polypropylene composites by Ti₃C₂ Mxene nanosheets