PMID- 19447404
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20090902
LR  - 20091111
IS  - 1095-7103 (Electronic)
IS  - 0021-9797 (Linking)
VI  - 336
IP  - 2
DP  - 2009 Aug 15
TI  - Role of water on PMMA/clay nanocomposites synthesized by in situ polymerization 
      in ethanol and supercritical carbon dioxide.
PG  - 443-8
LID - 10.1016/j.jcis.2009.04.044 [doi]
AB  - Poly(methylmethacrylate) (PMMA)/montmorillonite clay nanocomposites were 
      synthesized via the free radical polymerization of MMA in the presence of alkyl 
      ammonium substituted polysilsesquioxane surfactant-modified clay and AIBN 
      initiator in supercritical CO(2) and ethanol. The reactions were also conducted 
      by adding a small amount of water to observe the intercalation and exfoliation 
      behavior of the clay and the properties of the nanocomposites. Initially, clay 
      was cation exchanged with the surfactant to enhance its hydrophobicity and to 
      expand the interlamellar spaces of silicate platelets. Organophilization with the 
      three dimensional surfactant and a small amount of water molecules in the solvent 
      reduced the surface energy of clay dramatically, which promoted the miscibility 
      of polymer/clay nanocomposites. The morphology of the nanocomposites was 
      characterized by scanning electron microscopy. The intercalation and dispersion 
      of the clay were quantified by both X-ray diffraction and transmission electron 
      microscopy. Due to the three dimensional structure, alkyl ammonium substituted 
      polysilsesquioxane surfactant gives stable clay separation and dimension 
      stability of the nanocomposites. Different distribution of the clay also plays an 
      important role in physical properties. Thermogravimetric analysis and 
      differential scanning calorimetry were employed to investigate the thermal 
      properties and glass transition temperature of the nanocomposites.
FAU - Hossain, Md Daloar
AU  - Hossain MD
AD  - Division of Image and Information Engineering, Pukyong National University, San 
      100 Yongdang-dong, Nam-gu, Busan 608-739, Republic of Korea.
FAU - Kim, Won Soo
AU  - Kim WS
FAU - Hwang, Ha Soo
AU  - Hwang HS
FAU - Lim, Kwon Taek
AU  - Lim KT
LA  - eng
PT  - Journal Article
DEP - 20090421
PL  - United States
TA  - J Colloid Interface Sci
JT  - Journal of colloid and interface science
JID - 0043125
EDAT- 2009/05/19 09:00
MHDA- 2009/05/19 09:01
CRDT- 2009/05/19 09:00
PHST- 2009/01/21 00:00 [received]
PHST- 2009/04/08 00:00 [revised]
PHST- 2009/04/09 00:00 [accepted]
PHST- 2009/05/19 09:00 [entrez]
PHST- 2009/05/19 09:00 [pubmed]
PHST- 2009/05/19 09:01 [medline]
AID - S0021-9797(09)00458-5 [pii]
AID - 10.1016/j.jcis.2009.04.044 [doi]
PST - ppublish
SO  - J Colloid Interface Sci. 2009 Aug 15;336(2):443-8. doi: 
      10.1016/j.jcis.2009.04.044. Epub 2009 Apr 21.