TY - JOUR
T1 - Free volume in layered organosilicate-polystyrene nanocomposites
AU - Olson, B. G.
AU - Peng, Z. L.
AU - Srithawatpong, R.
AU - McGervey, J. D.
AU - Ishida, H.
AU - Jamieson, A. M.
AU - Manias, E.
AU - Giannelis, E. P.
PY - 1997
Y1 - 1997
N2 - Experimental studies by Positron Annihilation Lifetime Spectroscopy of free volume in a layered Organosilicate-Polystyrene nanocomposite are reported. Specifically, the intensity (I3) and lifetime (τ3) of orthopositronium annihilation were determined for an organically-modified mica-type silicate(OMTS), an atactic polystyrene specimen (Mw), and an OMTS/Polystyrene nanocomposite. The neat OMTS material is produced by a cation exchange reaction between the mica-like silicate and an alkylammonium salt, and has a structure which consists of weakly-cohesive silicate layers connected by galleries with an average spacing of 2.253 nm. The presence of the complexed alkylammonium cations in the galleries between the silicate layers renders the material hydrophobic. On forming the nanocomposite, the interlayer spacing increases to 3.031 nm. PAL analysis of the nanocomposite will be presented and the o-Ps annihilation characteristics, as well as the mean lifetime behaviors, are discussed. Moreover, a comparison of the nanocomposite behavior with the that of the Organosilicate and the bulk polymer is done, in order to unveil the behavior of the confined polystyrene.
AB - Experimental studies by Positron Annihilation Lifetime Spectroscopy of free volume in a layered Organosilicate-Polystyrene nanocomposite are reported. Specifically, the intensity (I3) and lifetime (τ3) of orthopositronium annihilation were determined for an organically-modified mica-type silicate(OMTS), an atactic polystyrene specimen (Mw), and an OMTS/Polystyrene nanocomposite. The neat OMTS material is produced by a cation exchange reaction between the mica-like silicate and an alkylammonium salt, and has a structure which consists of weakly-cohesive silicate layers connected by galleries with an average spacing of 2.253 nm. The presence of the complexed alkylammonium cations in the galleries between the silicate layers renders the material hydrophobic. On forming the nanocomposite, the interlayer spacing increases to 3.031 nm. PAL analysis of the nanocomposite will be presented and the o-Ps annihilation characteristics, as well as the mean lifetime behaviors, are discussed. Moreover, a comparison of the nanocomposite behavior with the that of the Organosilicate and the bulk polymer is done, in order to unveil the behavior of the confined polystyrene.
UR - http://www.scopus.com/inward/record.url?scp=0031372737&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031372737&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/msf.255-257.336
DO - 10.4028/www.scientific.net/msf.255-257.336
M3 - Article
AN - SCOPUS:0031372737
SN - 0255-5476
VL - 255-257
SP - 336
EP - 338
JO - Materials Science Forum
JF - Materials Science Forum
ER -