Ring Opening Metathesis Polymerization of Polyoctahedral Oligomeric Silsesquioxanes (POSS) Incorporated Oxanorbornene-5,6-dicarboximide: Synthesis, Characterization, and Surface Morphology of Copolymers
D. Gnanasekaran A , K. Madhavan A , John Tsibouklis B and B. S. R. Reddy A CA Industrial Chemistry Laboratory, Central Leather Research Institute (Council of Scientific & Industrial Research), Chennai-600 020, India.
B Biomaterials & Drug Delivery Research Group, School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth, Hampshire PO1 2DT, United Kingdom.
C Corresponding author. Email: induchem2000@yahoo.com
Australian Journal of Chemistry 64(3) 309-315 https://doi.org/10.1071/CH10367
Submitted: 8 October 2010 Accepted: 6 January 2011 Published: 11 March 2011
Abstract
The synthesis and characterization of N-propyl-POSS-7-oxanorbornene-5,6-dicarboximide (NPONDI) and N-3-(trifluoromethyl)phenyl-7-oxanorbornene-5,6-dicarboximide (TFNDI) was reported. The synthesis of the POSS-based (co)polymers were accomplished by ring opening metathesis polymerization (ROMP). The monomers and polymers were characterized using FT-IR, 1H-, 13C-, 29Si-NMR, and GPC techniques. Thermal properties of TFNDI-NPONDI copolymers were evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Transmission electron microscopic (TEM) analysis of optically transparent and flexible copolymer films revealed the presence of 50 nm-sized POSS agglomerates. Atomic force microscopy analysis of the film surface exhibited a modest increase in surface roughness of TFNDI-NPONDI copolymers as compared with homopoly[N-3(trifluoromethyl)phenyl-7-oxanorbornene-5,6-dicarboximide] (HTFNDI). The POSS incorporated polymers such as 1NPONDI, 2NPONDI, and 3NPONDI increased the hydrophobicity as compared with HTFNDI. This was measured by static contact angle analysis. The study focussed on the dispersion, surface morphology, and the microstructure of POSS in TFNDI-NPONDI copolymer as determined by scanning electron microscopy (SEM).
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