Silsesquioxane Nanocomposites
POSS refers to polymeric oligomeric silsesquioxane which can be incorporated into a variety of polymers with useful effects. (RDC 12/29/2010)
A silsesquioxane is a compound with the empirical chemical formula RSiO3/2 where Si is the element silicon, O is oxygen and R is either hydrogen or an alkyl, alkene, aryl, arylene group. This materials can be used as a support for catalysts. Silsesquioxanes can have a cage like structure, see Figure 1, which is most commonly cubes, hexagonal prisms and octagonal prisms
(Wikipedia, Silsesquioxane, 12/16/2010)
"POSS® Technology is derived from a continually evolving class of compounds closely related to silicones through both composition and nomenclature. POSS chemical technology has two unique features:
- The chemical composition is a hybrid, intermediate (RSiO1.5) between that of silica (SiO2) and silicone (R2SiO).
- POSS molecules are physically large with respect to polymer dimensions and nearly equivalent in size to most polymer segments and coils."
“POSS molecules can be thought of as the smallest particles of silica possible. However unlike silica or modified clays, each POSS molecule contains covalently bonded reactive functionalities suitable for polymerization or grafting POSS monomers to polymer chains. Each POSS molecule contains nonreactive organic functionalities for solubility and compatibility of the POSS segments with the various polymer systems.”
(Hybrid Plastics, POSS, 12/16/2010).
Epoxy /POSS Nanocomposites
Materials
Nanocomposites
PMMA/POSS Nanocomposites
Polycarbonate /POSS Nanocomposites
Polyethylene /POSS Nanocomposites
Polyethylene Glycol /POSS Nanocomposites
Polyhedral Oligomeric Metallo Sesquioxanes (POMS)
Polyimide /POSS Nanocomposites
Polylactic Acid /POSS Nanocomposites
Polystyrene (PS) /POSS Nanocomposites
Polyurethane (PUR) /POSS Nanocomposites
POSS/PCL Nanocomposite Shape Memory Material
PPO/Polyamide/POSS Nanocomposites
PS-PMMA /POSS Copolymers
Silicone /POSS Nanocomposites
Ferrite /POSS Nanocomposites
TiO2 /POSS Nanocomposites
Recent Journal Articles
12/3/2010
In vivo tissue responses to thermal-responsive shape memory polymer nanocomposites
(985-991) Biomaterials 32 #4 (2011)
Filion et al of theUniversity of Massachusetts developed a class of biodegradable POSS-SMP nanocomposites exhibiting stable temporary shape fixing and facile shape recovery within a narrow window of physiological temperatures. The materials were covalently crosslinked from star-branched building blocks consisting a bioinert polyhedral oligomeric silsesquioxane (POSS) core and 8 degradable poly(d,l-lactide) arms. These minimally immunogenic and biodegradable shape memory polymers are promising candidates for scaffold-assisted tissue repair where both facile surgical delivery and controlled degradation of the scaffold are desired for achieving optimal short-term and long-term clinical outcomes. (RDC 11/29/2010)
10/29/2010
Ultrasonochemical-assisted fabrication and evaporation- induced self-assembly (EISA) of POSS-SiO2@Ag core/ABA triblock copolymer nanocomposite film
(pages 1620–1627)Polymer Composites 31 #9 (2010)
Veerapandian, and Yun of Kyungwon University, South Korea synthesized the composite in both water and in organic medium utilizing ultrasonochemical reaction. The resultant inorganic–organic nanocomposite can be easily suspended in water and would be useful in variety of applications. (RDC 12/15/2010)