Effect Of Various Additives On The Properties Of Poly (L-Lactic Acid)/Poly (Butylene Succinate-Co-L-Lactate) Blend
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Date
2011-11
Authors
Chou, Pui May
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Polymer blends of poly(L-lactic acid) (PLLA) and poly(butylene succinate-co-Llactate)
(PBSL) at various blending ratios were prepared through melt mixing
method. The blending of PLLA with PBSL resulted in an improvement in the
toughness and thermal stability of the PLLA blend. However, flexural strength and
modulus decreased with the increase in PBSL content. Annealing was conducted
after the optimum blending ratio was determined. Analysis on the annealing revealed
that the degree of crystallinity and flexural modulus were enhanced with increasing
annealing time. Next, poly(ethylene adipate) (PEA) and poly(tetramethylene ether
glycol) (PTMEG) were added as compatibilizers to the PLLA/PBSL blend. The
FTIR analysis showed that the physical interaction between PEA and PLLA/PBSL
blend occurred and this was due to the presence of secondary force. The flexural
strength exhibited a dependency on the extent of the secondary force interaction
between PEA and PTMEG with the blends. The effect of PLLA/PBSL blend with
varying contents of titanium dioxide (TiO2) and carbon nanotubes (CNT) were
investigated. An increase in flexural modulus of 4.3% and 8.4% was obtained with
the addition of 0.25 phr TiO2 and CNT, respectively. Apatite layer was formed on the
surface of the nanocomposite containing TiO2 nanotubes after soaking in simulated
body fluid (SBF) for 7 days. An increase in the water absorption of the
PLLA/PBSL/TiO2 nanocomposite occurred with increased filler loading. The
PLLA/PBSL/CNT nanocomposite exhibited an increasing trend of water absorption
similar to the PLLA/PBSL blend.
Description
Keywords
Effect of various additives on the properties , of poly l-lactic acid)/poly butylene succinate-co-l-lactate blend