Processibility and Miscibility Studies of Uncompatibilized Linear Low Density Polyethylene/Poly(Vinyl Alcohol) Blends

Ismail, Hanafi; Ahmad, Zulkifli; Nordin, Rumaizah Mohd; Rashid, Anas

doi:10.1080/03602550903147379

Cited by 28 publications

(31 citation statements)

References 23 publications

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“…The formation of PVOH agglomerates and holes are evidence of the weak interfacial adhesion between the LLDPE and PVOH. This finding is in good agreement with a previous study by Ismail et al (2009), which reported that there is poor interaction and phase separation between PVOH and LLDPE due to their incompatibility. The point of interest, however, would be the presence of fiber debonding in the composites; therefore, in Fig.…”

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 83%

Effects of Kenaf Loading on Processability and Properties of Linear Low-Density Polyethylene/Poly (Vinyl Alcohol)/Kenaf Composites

Pang¹,

Ismail²,

Bakar³

2015

BioResources

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aThis study was conducted to evaluate the possibility of utilizing kenaf (KNF) in LLDPE/PVOH to develop a new thermoplastic composite. The effect of KNF loading on the processability and mechanical, thermal and water absorption properties of linear low-density polyethylene/poly (vinyl alcohol)/kenaf (LLDPE/PVOH/KNF) composites were investigated. Composites with different KNF loadings (0, 10, 20, 30, and 40 phr) were prepared using a Thermo Haake Polydrive internal mixer at a temperature of 150 °C and rotor speed of 50 rpm for 10 min. The results indicate that the stabilization torque, tensile modulus, water uptake, and thermal stability increased, while tensile strength and elongation at break decreased with increasing filler loading. The tensile fractured surfaces observed by scanning electron microscopy (SEM) supported the deterioration in tensile properties of the LLDPE/PVOH/KNF composites with increasing KNF loading.

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Section: Thermogravimetric Analysis (Tga)supporting

confidence: 83%

Effects of Kenaf Loading on Processability and Properties of Linear Low-Density Polyethylene/Poly (Vinyl Alcohol)/Kenaf Composites

Pang¹,

Ismail²,

Bakar³

2015

BioResources

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“…60/40), similar to what has been reported previously: according to Daoud,28 who used the Gennes's model to study the microphase separation that is present in crosslinked polymer blends, a high concentration of PDDA could hinder the PVA cross-linking, which facilitates phase separation at the macroscale. Similarly, Ismail and co-workers 29 also studied the phase separation morphology in polymer blends of PVA and linear low-density polyethylene (LLDPE). They report the formation of large individual agglomerates at polymer weight ratios close to 1; as a result of both, increased interfacial tension and phase separation is possible.…”

Section: Resultsmentioning

confidence: 99%

Graphene Oxide–Polymer Nanocomposite Anion-Exchange Membranes

Movil

Frank

2015

J. Electrochem. Soc.

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Functionalized graphene oxide (FGO) was incorporated into polyvinyl alcohol/ poly(diallyldimethylammonium chloride) semiinterpenetrating polymer networks (PVA/PDA SIPNs) in order to create novel nanocomposite anion-exchange membranes (AEMs) with improved OH − conductivity and good thermo-mechanical stability at high relative humidity. The nanocomposites were fabricated by a solvent-casting method and subsequently thermally crosslinked to improve their mechanical stability in the hydrated state. The effects of PVA/PDDA ratio, cross-linking method, cross-linking temperature, and FGO content were studied in order to determine the optimal conditions to fabricate AEMs with improved material properties. The membranes were characterized by XRD, FTIR, TGA, FE-SEM, and impedance spectroscopy to assess the material properties of FGO and the nanocomposite membranes. The membranes were also evaluated as polymer electrolytes in anion exchange membrane fuel cells. The results reveal that the membrane fabricated at a PVA/PDDA weight ratio of 70/30 and 20 wt% FGO possesses the highest value of OH − conductivity (12.1 mS cm −1 @ 30 • C and 21 mS cm −1 @ 80 • C), as well as improved thermo-mechanical stability at 100% R.H. However, the fuel cell performance reaches a maximum using the membrane fabricated at 10 wt% FGO. Anion exchange membrane fuel cells (AEMFCs) have attracted considerable attention during the last few years due to some advantages that these kinds of systems offer compared to proton exchange membranes fuel cells (PEMFCs).1,2 For example, thanks to the facile kinetics for electrochemical charge transfer in alkaline environments, it is possible to use less expensive catalysts like nickel and silver in AEM-based fuel cells. 3 In terms of the fuel management, it is also possible to use concentrated fuels to operate these devices, because of the often reduced fuel crossover in AEMs. 4 Unfortunately, AEMFCs have some issues, specifically related to the polyelectrolyte performance. In general, AEMs have lower ionic conductivity than PEMs, mostly due to the fact that conductivity of OH − is intrinsically lower than H + . 5 Another concern with the use of AEMs is the degradation of their cationic groups in strong alkaline media. 6 In addition, AEMs usually exhibit poor solubility in low boiling point and inexpensive solvents, leading to less environmentallyfriendly fabrication processes with high costs and high degree of complexity. 7In order to overcome these limitations, a wide variety of membranes have been proposed during the last few decades as AEMs, including homopolymers, heterogeneous membranes and semi-interpenetrating polymer networks (SIPNs). [8][9][10][11] Among the various options available, SIPNs have gained relevance due to ease of fabrication, acceptable ionic conductivities, and excellent mechanical properties.12-14 More specifically, poly(vinyl alcohol)/poly(diallyldimethylammonium chloride) (PVA/PDDA) SIPNs are promising membranes for applications in electrochemical energy systems mainly because PVA is ...

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“…The weight ratio of LLDPE/PVA was maintained at 60:40 (wt.%), as this ratio gives the best overall blend properties (Ismail et al 2009). The melt compounding of LLDPE/PVA/KNF composites with TMS was done in an internal mixer (Model R600/610, Thermo Haake Polydrive, Germany) at a temperature of 150 °C and a rotor speed of 50 rpm.…”

Section: Composite Preparationmentioning

confidence: 99%

Tensile Properties, Water Resistance, and Thermal Properties of Linear Low-Density Polyethylene/Polyvinyl Alcohol/Kenaf Composites: Effect of 3-(trimethoxysilyl) propyl Methacrylate (TMS) as a Silane Coupling Agent

2016

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aComposites containing linear low-density polyethylene/polyvinyl alcohol and various loadings of kenaf fiber were prepared using a Haake internal mixer. The loading of kenaf fiber varied from 10 to 40 parts per hundred resin (phr). The coupling agent 3-(trimethoxysilyl)propyl methacrylate (TMS) was evaluated for its effect on the processing torque, tensile properties, morphology, water resistance, and thermal properties of the composites. Composites without TMS were used as the control. The composites made from TMS-treated kenaf yielded higher stabilization torque, tensile strength, tensile modulus, water resistance, and thermal properties than the control composites. The improvements were attributed to the coupling effect of TMS.

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Processibility and Miscibility Studies of Uncompatibilized Linear Low Density Polyethylene/Poly(Vinyl Alcohol) Blends

Cited by 28 publications

References 23 publications

Effects of Kenaf Loading on Processability and Properties of Linear Low-Density Polyethylene/Poly (Vinyl Alcohol)/Kenaf Composites

Effects of Kenaf Loading on Processability and Properties of Linear Low-Density Polyethylene/Poly (Vinyl Alcohol)/Kenaf Composites

Graphene Oxide–Polymer Nanocomposite Anion-Exchange Membranes

Tensile Properties, Water Resistance, and Thermal Properties of Linear Low-Density Polyethylene/Polyvinyl Alcohol/Kenaf Composites: Effect of 3-(trimethoxysilyl) propyl Methacrylate (TMS) as a Silane Coupling Agent

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