High-performance polymer/nanodiamond composites: synthesis and properties

International Journal of Polymer Analysis and Characterization

2016

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The blend membranes of polystyrene-block-polyisoprene-block-polystyrene (SIS) and polyethylene-block-poly(ethylene glycol)-block-polycaprolactone (E-EG-CL) were designed using phase inversion technique. The poly(methyl methacrylate) coated gold nanoparticles (PMMA-AuNPs) have size around 40-50 nm. The honey comb shaped nanopores were uniformly dispersed in SIS/E-EG-CL/PMMA-AuNPs blend membranes.There was 16 % increase in tensile strength and 33 % in tensile modulus of SIS/E-EG-CL/PMMA-AuNPs 1 relative to neat membrane. With 1 wt. % nano-particles, membrane showed higher water flux of 59.2 mLcm −2 min −1 and salt rejection ratio of 25.4 %, while SIS/E-EG-CL membrane without PMMA-AuNPs had a lower flux (43.8 mLcm −2 min −1 ) and salt rejection (18.5 %).

“…4). Here, the enhancement in the mechanical properties was attributed to the greater interface provided by higher nano-particle content towards the polymer chains [26].…”

Section: Mechanical Featuresmentioning

confidence: 91%

Self-assembled tri-block terpolymer blend membranes reinforced with poly(methyl methacrylate)-coated gold nanoparticles obtained through phase inversion technique

International Journal of Polymer Analysis and Characterization

2016

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“…The tensile data is depicted in Fig. 4 and Table 1 Here, enhancement in the mechanical properties was attributed to the greater interface provided by higher nano-particle content towards the polymer chains [24] . …”

Section: Mechanical Featuresmentioning

confidence: 97%

Investigation on Self-assembled Blend Membranes of Polyethylene-block-poly(ethylene glycol)-block-polcaprolactone and Poly(styrene-block-methyl methacrylate) with Polymer/gold Nanocomposite Particles

Polymer-Plastics Technology and Engineering

2015

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To cite this article: Ayesha Kausar (2015): An Investigation on Self assembled Blend Membranes of Polyethylene-blockPoly(ethylene glycol)-block-Polcaprolactone and Poly(styrene-block-methyl methacrylate) with Polymer/Gold Nanocomposite particles, Polymer-Plastics Technology and Engineering, Abstract A block copolymer of polyethylene-block-poly(ethylene glycol) (PE-b-PEG) and polycaprolactone (PCL) was prepared via coordination-insertion polymerization. Blend membranes of poly(styrene-block-methyl methacrylate) (PS-b-MMA) and PE-b-PEG-b-PCL were used as matrix. Gold/polystyrene nanoparticles (AuNPs-PSNPs) were employed as nano-filler in PE-b-PEG-b-PCL/PS-b-MMA/AuNPs-PSNPs membranes. The double gyroid pattern was depicted by blend chains in PE-b-PEG-b-PCL/PS-b-MMA/AuNPs-PSNPs. An improvement of 22 % in tensile strength and 54 % in tensile modulus was observed with 1 wt. % nano-particle addition. PE-b-PEG-b-PCL/PS-b-MMA/AuNPs-PSNPs 1 showed water flux of 45.2 mLcm −2 min −1 and salt rejection ratio of 17.5 %. Efficiency of AuNPs-PSNPs reinforced membranes in removal of heavy metal ions was 100 %. Downloaded by [University of Nebraska, Lincoln] at 01:50 24 August 2015 2

“…Moreover, the higher nanoparticle content actually provided greater interface for the polymer chains, compared with the lower AuNPsPSNPs level. The enhancement was due to the fine miscibility of the particles with the matrix (Ashraf et al 2014). Furthermore, there was fine enhancement in the tensile modulus for the PSCMS-g-DGEBA/AuNPs-PSNPs 1 membrane (2.9 GPa) relative to PSCMS-g-DGEBA/ AuNPs-PSNPs 0.1 (1.8 GPa), PSCMS-g-DGEBA/AuNPsPSNPs 0.3 (2.2 GPa), and PSCMS-g-DGEBA/AuNPsPSNPs 0.5 (2.6 GPa) and neat matrix (1.5 GPa).…”

Section: Mechanical Featuresmentioning

confidence: 99%

Nanofiltration membranes of poly(styrene-co-chloro-methylstyrene)-grafted-DGEBA reinforced with gold and polystyrene nanoparticles for water purification

Siddiq

2015

Appl Water Sci

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The matrix material for nanofiltration membranes was prepared through chemical grafting of poly (styrene-co-chloromethylstyrene) (PSCMS) to DGEBA using hexamethylenediamine as linker. The phase inversion technique was used to form PSCMS-g-DGEBA membranes. This effort also involves the designing of gold nanoparticles and its composite nanoparticles with polystyrene microspheres as matrix reinforcement. The nanoporous morphology was observed at lower filler content and there was formation of nanopattern at increased nanofiller content. The tensile strength was improved from 32.5 to 35.2 MPa with the increase in AuNPs-PSNPs loading from 0.1 to 1 wt%. The glass transition temperature was also enhanced from 132 to 159°C. The membrane properties were measured via nanofiltration set-up. Higher pure water permeation flux, recovery, and salt rejection were measured for novel membranes. PSCMS-g-DGEBA/ AuNPs-PSNPs membrane with 1 wt% loading showed flux of 2.01 mL cm -2 min -1 and salt rejection ratio of 70.4 %. Efficiency of the gold/polystyrene nanoparticles reinforced membranes for the removal of Hg 2? and Pb 2 was found to be 99 %. Novel hybrid membranes possess fine characteristics to be utilized in industrial water treatment units.