Viscoelastic response of multilayer polymeric films of linear low-density polyethylene and ethylene vinyl alcohol copolymer

2014 ◽  
Vol 55 (9) ◽  
pp. 1960-1968 ◽  
Author(s):  
Maria Serral ◽  
Marc Mangnus ◽  
Peter Sandkühler ◽  
Josep Bonet Avalos
Keyword(s):  
Vinyl Alcohol ◽  
Polymeric Films ◽  
Low Density Polyethylene ◽  
Viscoelastic Response ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Ethylene Vinyl Alcohol ◽  
Ethylene Vinyl Alcohol Copolymer

Barrier, mechanical, and thermal properties of the three-layered co-extruded blown polyethylene/ethylene–vinyl alcohol/low density polyethylene film without tie layers

2015 ◽  
Vol 30 (6) ◽  
pp. 794-807 ◽  
Author(s):  
Changfeng Ge ◽  
Kai Lei ◽  
Robert Aldi
Keyword(s):  
Vinyl Alcohol ◽  
Control Sample ◽  
Barrier Properties ◽  
Peel Strength ◽  
Low Density Polyethylene ◽  
Mechanical And Thermal Properties ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Ethylene Vinyl Alcohol ◽  
Blown Film

This article investigates three-layer co-extruded blown film comprised of low-density polyethylene (LDPE)/ethylene–vinyl alcohol (EVOH)/LDPE without adhesion layers. Various thicknesses of pure EVOH were sandwiched by outer LDPE layers blended with linear low-density polyethylene-grafted-maleic anhydride (LLDPE- g-MAH) as compatibilizer in concentrations from 0 wt% to 2.0 wt%. The study found that a mere 3-μ EVOH layer can achieve a 180 times improvement of oxygen barrier properties as compared to the control sample. When the EVOH loading is 10–15 wt% of the total film mass, the addition of LLDPE- g-MAH into the outer layers indicated a positive synergistic effect by enhancing barrier properties. In contrast, when the EVOH loadings are at 5 wt% and 7.5 wt%, the barrier properties of the film was reduced. Layer-to-layer interaction between the LDPE and EVOH was notably improved as demonstrated by a 26–42% increase of interlaminate peel strength in the presence of 0.5–2 wt% LLDPE- g-MAH in all samples. Congruently, the introduction of the LLDPE- g-MAH into the outer LDPE layers also resulted in an increased dart impact toughness and tensile strength for the film. The EVOH crystallinity showed a reduction after adding LLDPE- g-MAH, particularly apparent for the lower EVOH concentrations.

Linear Low Density Polyethylene/Poly(Vinyl Alcohol)/Kenaf (LLDPE/PVA/KNF) Composites: Effect of 3-(Trimethoxysilyl)Propyl Methacrylate as Silane Coupling Agent on Tensile and Morphological Properties

2016 ◽  
Vol 694 ◽  
pp. 3-7
Author(s):  
Ai Ling Pang ◽  
Hanafi Ismail ◽  
Azhar Abu Bakar
Keyword(s):  
Coupling Agent ◽  
Vinyl Alcohol ◽  
Silane Coupling Agent ◽  
Low Density Polyethylene ◽  
Poly Vinyl Alcohol ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Propyl Methacrylate ◽  
Morphological Studies ◽  
Silane Coupling

The tensile properties and morphological studies of linear low density polyethylene (LLDPE)/poly (vinyl alcohol) (PVA)/kenaf (KNF) composites with and without 3-(trimethoxysilyl) propyl methacrylate (silane coupling agent) were investigated. The composites with different KNF loading (10, 20, 30, 40 phr) were prepared using a Thermo Haake Polydrive internal mixer at 150°C and 50 rpm for 10 min. The results indicated that composites with 3-(trimethoxysilyl) propyl methacrylate gives higher tensile strength and modulus but lower elongation at break than composites without. The presence of 3-(trimethoxysilyl) propyl methacrylate found to enhance the interfacial adhesion between LLDPE/PVA matrix and KNF fiber. Morphological studies on tensile fractured surfaces showed good adhesion between LLDPE/PVA matrix and KNF, and better dispersion of KNF for the composites with 3-(trimethoxysilyl) propyl methacrylate.

Tensile Properties and Morphological Studies of Kenaf-Filled Linear Low Density Polyethylene/Poly(Vinyl Alcohol) (LLDPE/PVA/KNF) Composites: The Effects of KNF Loading

2016 ◽  
Vol 1133 ◽  
pp. 156-160 ◽  
Author(s):  
Ai Ling Pang ◽  
Hanafi Ismail ◽  
Azhar Abu Bakar
Keyword(s):  
Tensile Properties ◽  
Vinyl Alcohol ◽  
Tensile Modulus ◽  
Low Density Polyethylene ◽  
Poly Vinyl Alcohol ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Elongation At Break ◽  
Morphological Studies ◽  
Internal Mixer

Tensile properties and morphological studies of linear low density polyethylene (LLDPE)/poly (vinyl alcohol) (PVA)/kenaf (KNF) composites were investigated. The composites with different KNF loading (0, 10, 20, 30, 40 phr) were prepared using a Thermo Haake Polydrive internal mixer at 150°C and 50 rpm for 10 min. The results indicated that tensile strength and elongation at break were decreased with increasing KNF loading, whereas tensile modulus showed the opposite trend. Tensile fractured surfaces observed by scanning electron microscopy showed better interfacial adhesion between LLDPE/PVA and KNF at 10 phr KNF loading.

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