Sung Ting, Sam
(2011)
Preparation, Characterization And
Properties Of Degradable Linear Low Density
Polyethylene soya Powder Blends.
PhD thesis, Universiti Sains Malaysia..
Abstract
The linear low density polyethylene (LLDPE) was blended with soya powder by
using Haake internal mixer at a temperature of 150°C and rotor speed of 50 rpm. The
tensile properties were tested using an Instron tensometer. The thermal behaviors of
the blends were analyzed using differential scanning calorimetry (DSC). The thermal
stability of the blends was determined using a thermogravimetric analyzer (TGA).
The soya powder content was varied from 5 to 40 wt%. Two types of compatibilisers
were used to improve the interfacial adhesion of LLDPE/soya powder blends which
are polyethylene grafted maleic anhydride (PE-g-MA) and epoxidised natural rubber
with 50 mol%. epoxidation (ENR 50). Tensile strength and elongation at break (Eb)
decreased with increasing soya powder content. The addition of PE-g-MA as a
compatibiliser increased the tensile strength, Eb, and modulus of the blends.
Furthermore, the addition of PE-g-MA slightly enhanced the thermal stability of the
blends. On the other hand, the tensile strength, Eb and thermal stability were
significantly improved by the addition of ENR 50. During natural weathering and
natural soil burial for 1 year, it was observed that the incorporation of soya powder
had increased the degradability after exposure. However, PE-g-MA compatibilised
blends showed lower degradability than uncompatibilised blends based on tensile
properties, carbonyl indices, crystallinity, weight loss and molecular weight change
observations. Nevertheless, it is found that degradability of ENR 50 compatibilised
blends was higher than uncompatibilised blends upon exposure
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