Thermal and Biodegradable Properties of Poly(<Emphasis Type="SmallCaps">l</Emphasis>-lactide)/Poly(ε-Caprolactone) Compounded with Functionalized Organoclay |
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Authors: | Qifang Li Jin-San Yoon Guang-Xin Chen |
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Institution: | (1) Key Laboratory on Preparation and Processing of Novel Polymer Materials of Beijing, Beijing University of Chemical Technology, 100029 Beijing, China;(2) Department of Polymer Science and Engineering, Inha University, Incheon, 402-751, Korea; |
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Abstract: | Poly(l-lactide) (PLLA)/Poly(ε-caprolactone) (PCL) blends were compounded with commercially available organoclay Cloisite 25A (C25A)
and C25A functionalized with epoxy groups, respectively. Epoxy groups on the surface of C25A were introduced by treating C25A
with (glycidoxypropyl)trimethoxy silane (GPS) to produce so called Functionalized Organoclay (F-C25A). The silicate layers
of PLLA/PCL/F-C25A were exfoliated to a larger extent than PLLA/PCL/C25A. Incorporation of the epoxy groups on C25A improved
significantly mechanical properties of PLLA/PCL/C25A. The larger amount of exfoliation of the silicate layers in PLLA/PCL/F-C25A
as compared with that in PLLA/PCL/C25A was attributed to the increased interfacial interaction between the polyesters and
the clay due to chemical reaction. Thermo gravimetric analysis revealed that the nanocomposites with exfoliated silicate layers
were more thermally stable than those with intercalated silicate layers. The biodegradability of the neat PLLA/PCL and corresponding
nanocomposite was studied under compost, and the rate of biodegradation of PLLA/PCL increased after nanocomposite preparation. |
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