THE EFFECT OF ANHYDRIDE MODIFICATION OF SAGO STARCH ON THE TENSILE AND WATER ABSORPTION PROPERTIES OF SAGO-FILLED LINEAR LOW-DENSITY POLYETHYLENE (LLDPE)

Abstract The aim of this research is to investigate the effects of different thermoplastic starches and starch contents on the physico-mechanical and morphological properties of new polymeric-based composites from low density polyethylene (LDPE) and thermoplastic starches. Different compositions of thermoplastic starches (5–40 wt%) and LDPE were melt blended by extrusion and injection molding. The resultant materials were characterized with respect to the following parameters, i.e., melt flow index (MFI), mechanical properties (tensile, flexural, stiffness and impact strength) and water absorption. Scanning electron microscopy (SEM) was also used in this study for evaluating blend miscibility. MFI values of all blends decreased as the starch content increased, while the sago starch formulation showed a higher MFI value than others. The incorporation of fillers into LDPE matrix resulted in an increased in tensile modulus, flexural strength, flexural modulus and slightly decreased tensile strength and impact strength. However, sago starch filled composites exhibited better mechanical properties as compared to other starches. The SEM results revealed that the miscibility of such blends is dependent on the type of starch used. The water absorption increased with immersion time and the thermoplastic sago starch samples showed the lowest percentage of water absorption compared with other thermoplastic starches.

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Properties of kapok husk-filled linear low-density polyethylene ecocomposites

Journal of Thermoplastic Composite Materials ◽

10.1177/0892705715583175 ◽

2016 ◽

Vol 29 (12) ◽

pp. 1641-1655 ◽

Cited By ~ 9

Author(s):

Koay Seong Chun ◽

Salmah Husseinsyah ◽

Nurul Fatin Syazwani

Keyword(s):

Tensile Strength ◽

Water Absorption ◽

Coupling Agent ◽

Tensile Modulus ◽

Low Density Polyethylene ◽

Low Density ◽

Linear Low Density Polyethylene ◽

Elongation At Break ◽

Ester Linkage ◽

Natural Filler

This research focuses on utilization of kapok husk (KH) as a natural filler in linear low-density polyethylene (LLDPE) ecocomposites. The effect of KH content and coupling agent on tensile properties, thermal properties, water absorption behavior, and morphology of ecocomposites were studied. The addition of KH had increased tensile modulus and water absorption of ecocomposites, whereas tensile strength and elongation at break decreased. However, the polyethylene-grafted acrylic acid (PEAA) was used as a polymeric-coupling agent to enhance the properties of LLDPE/KH ecocomposites. The incorporation of PEAA improved the tensile strength, tensile modulus, crystallinity, and thermal stability as well as reduced the water absorption of LLDPE/KH ecocomposites. The improvement of those properties was caused by the enhanced interfacial bonding, which was evidenced by scanning electron microscopy. The Fourier transmission infrared spectra also confirmed the presence of ester linkage between PEAA and KH.

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Water absorption pattern and dimensional stability of oil palm fiber-linear low density polyethylene composites

Journal of Applied Polymer Science ◽

10.1002/app.31765 ◽

2010 ◽

Vol 117 (2) ◽

pp. 1064-1075 ◽

Cited By ~ 19

Author(s):

S. Shinoj ◽

S. Panigrahi ◽

R. Visvanathan

Keyword(s):

Water Absorption ◽

Dimensional Stability ◽

Oil Palm ◽

Low Density Polyethylene ◽

Low Density ◽

Linear Low Density Polyethylene ◽

Palm Fiber ◽

Absorption Pattern ◽

Polyethylene Composites

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Mechanical properties of sago starch-filled linear low density polyethylene (LLDPE) composites

Polymer Testing ◽

10.1016/s0142-9418(00)00018-0 ◽

2001 ◽

Vol 20 (2) ◽

pp. 167-172 ◽

Cited By ~ 55

Author(s):

R Nawang ◽

I.D Danjaji ◽

U.S Ishiaku ◽

H Ismail ◽

Z.A Mohd Ishak

Keyword(s):

Mechanical Properties ◽

Low Density Polyethylene ◽

Low Density ◽

Sago Starch ◽

Linear Low Density Polyethylene

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The Effect of Fiber Surface Treatment on the Water Absorption and Morphological Properties of Linear Low Density Polyethylene/Poly(Vinyl Alcohol)/Kenaf Composites

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.264.1 ◽

2017 ◽

Vol 264 ◽

pp. 1-4

Author(s):

Ai Ling Pang ◽

Hanafi Ismail ◽

Azhar Abu Bakar

Keyword(s):

Sodium Bicarbonate ◽

Water Absorption ◽

Vinyl Alcohol ◽

Interfacial Adhesion ◽

Morphological Properties ◽

Low Density Polyethylene ◽

Poly Vinyl Alcohol ◽

Low Density ◽

Linear Low Density Polyethylene ◽

Chromium Sulfate

The effect of untreated and treated (chromium sulfate and sodium bicarbonate) kenaf (KNF) on the water uptake and morphological properties of linear low density polyethylene/poly(vinyl alcohol)/kenaf (LLDPE/PVOH/KNF) composites was studied. The composites were prepared by using an internal mixer (Haake Polydrive) at 150 °C and 50 rpm for 10 min. The results showed that the untreated composites tend to absorb greater amount of water compared to the treated composites. This shows that the chromium sulfate and sodium bicarbonate treatment on KNF had improved the interfacial adhesion between KNF and LLDPE/PVOH matrices. Consequently, the capability of water absorption by the treated composites was reduced. Scanning electron microscope (SEM) result shows that lesser traces of filler pull-out and better filler-matrix interfacial adhesion were observed in the tensile fractured surfaces of treated composites.

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