Rheological, morphological and mechanical investigations on ethylene octene copolymer toughened polypropylene prepared by continuous electron induced reactive processing

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Polystyrene (PS)/ethylene–octene copolymer (EOC) blends with 80/20 wt % composition containing different amounts (0, 1.0, 2.5, 5.0 and 7.5 wt %) of an organically modified nanoclay were prepared by one‐step melt‐mixing method. Also, the EOC‐rich blends with 80 wt % EOC content loaded with 0 and 5.0 wt % of the nanoclay were prepared under the similar processing conditions. Presence of both PS and EOC chains in between clay layers localized at the interface of the blends could be deduced by X‐ray diffraction analysis, which suggested formation possibility of PS‐EOC physical structures at the blend interface. Transmission electron microscopy results confirmed that clay nanoparticles were mainly localized at the interface of the blends and also partly in the PS and EOC components of the systems. The localization of the nanoclay was also described by the linear viscoelastic melt rheological studies. It is also revealed that nanoclay had stronger interactions with PS than EOC. This is reflected in the higher tensile properties in the PS‐rich system. The analysis of morphology of the developed systems by emulsification curve revealed that the optimum amount of nanoclay to modify PS‐rich blend is 2.5 wt %. At this clay loading, the blend exhibited the highest impact resistance. According to the overall results, suitability of nanoclay was confirmed for compatibilization of the PS/EOC blends. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48748.

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Assessment of compatibilization role of nanoclay in immiscible polystyrene/ethylene–octene copolymer blends via wide‐angle X‐ray scattering, microstructure, rheological analyses, and mechanical properties

Kiani

Entezam

Khonakdar

et al. 2019

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“…The biodegradable PCL [Capa 6800, M n : 75,000 ± 3000 g mol −1 , dispersity index (DI): 2.4 ± 0.2; T m : 58 °C; crystallinity: 39%] was purchased from the Perstorp Group, Perstorp, Sweden. The PCL is intended to be used as toughening component for polylactide (PLA, 4032D, M n : 69,000 ± 2000 g mol −1 , DI: 2.6 ± 0.3) during electron‐induced reactive processing . In order to fulfill the requirements of melt blending, virgin PCL was masticated by melt mixing in air atmosphere at a temperature of 80 °C for 5 min to modify its viscosity and surface energy.…”

Section: Methodsmentioning

confidence: 99%

“…The PCL is intended to be used as toughening component for polylactide (PLA, 4032D, M n : 69,000 AE 2000 g mol −1 , DI: 2.6 AE 0.3) during electron-induced reactive processing. 20 In order to fulfill the requirements of melt blending, virgin PCL was masticated by melt mixing in air atmosphere at a temperature of 80 C for 5 min to modify its viscosity and surface energy. This masticated PCL [(mPCL), crystallinity: 34%] was used as raw material for this study.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of electron beam‐induced crosslinking of poly(ε‐caprolactone)—Effect of elevated temperatures

Huang

Gohs²,

Müller

et al. 2019

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The effect of elevated temperatures (40, 80, and 170 °C) on the electron beam (EB)‐induced crosslinking and degradation of poly(ε‐caprolactone) (PCL) in nitrogen atmosphere without adding crosslinking agents has been investigated. The increased mass average molecular mass of EB modified masticated PCL (mPCL) samples were measured by size exclusion chromatography. The sol–gel investigation showed that mPCL tended to dominating crosslinking at a temperature of 170 °C. At this temperature, the maximum gel content of 56% was observed for an EB treatment with a dose of 100 kGy. In addition, the ratio of chain scission density to density of crosslinked units amounted to 0.25. The dynamic rheological test demonstrated that EB treatment at 170 °C led to the most remarkable elasticity enhancement behavior with enhanced viscosity, modulus, and decreased loss factor (tan δ). The occurrence of branching structure was evidently detected by van Gurp–Palmen plot in combination with the Cole–Cole plot for dose values ≤50 kGy. Less δ and a broadened relaxation process can be observed due to the introduction of some branched structures into mPCL. The results of enhanced molar mass and gel content analysis were confirmed by the dynamic rheological measurements. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47866.

“…The controllable properties based on the octene content, besides excellent processability of EOC, have widen its application areas. The results indicated that by applying the suitable compatibilization, EOC could desirably modify the toughness and the impact resistance of a wide range of thermoplastics such as polypropylene (PP) at relatively low temperatures, poly(ethylene terephthalate) (PET) and polyamide 6 . However, there are limited works on the PS/EOC blends.…”

Section: Introductionmentioning

confidence: 99%

Melt rheology and interfacial properties of binary and ternary blends of PS, EOC, and SEBS

Entezam

Poormadadkar

Khonakdar

et al. 2019

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This works systematically investigates the interfacial properties of the binary and the ternary blends based on polystyrene (PS), ethylene octene copolymer (EOC), and styrene–ethylene–butylene–styrene (SEBS) by analyzing the melt linear rheological behavior of the blends and neat components. Moreover, the relationship between rheology, phase morphology, and mechanical properties of PS/EOC ternary blends with various quantities of SEBS were studied. The surface shear modulus (β) and interfacial tension values obtained by Palierne model indicated that the EOC/SEBS blend has the best interfacial properties, while the lowest interaction was found for PS/EOC blend. Based on the Palierne model and Harkin's spreading coefficients a core–shell type morphology with EOC phase encapsulated by the SEBS shell dispersed in the PS matrix was determined for the ternary blends. Scanning electron microscopy results revealed that both fibrillar and droplet forms of dispersed phase could be developed during the blending of PS and EOC in presence of SEBS. The extent of fibrillar morphology and interfacial interactions in PS/EOC/SEBS ternary blends was dependent on the SEBS content. The improvement of the mechanical properties of PS/EOC blends in the presence of SEBS was evidenced by the tensile and impact resistance experiments. The tensile strength reinforcement was more pronounced for the ternary blends with more fibrillar dispersed phase. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48791.