The focus of this study is on incorporating pendant sulfonate groups along the backbone of a liquid crystalline polyester (LCPE) with the aim to improve the dispersion of single wall carbon nanotubes (SWNTs) and nanodiamonds (NDs). Two LCPE matrices, one sulfonated (LCPE-S) and one nonsulfonated reference polymer (LCPE-R), were successfully synthesized via a melt condensation method using aromatic and aliphatic AB, AA, and BB-type monomers. Upon the introduction of SWNT and ND particles, the glass transition temperature (Tg) of the sulfonated LCPE increased from 21.5 C to 41.0 C and 41.9 C, for SWNTs and NDs, respectively. When sulfonate groups were absent, a decrease in Tg was observed. The storage modulus (E0) followed a similar trend, i.e., E0 increased from 1.3 GPa to 5.2 GPa and 3.4 GPa, upon the addition of NDs and SWNTs. The LCPE-S showed a lower thermal stability due to the loss of sulfonate groups, i.e. the 5% weight loss temperature (T5% d ) is 280 C for LCPE-S vs. 333 C for LCPE-R. The decomposition temperature increased somewhat upon addition of the nanoparticles. The ability of dispersing carbonbased nanostructures combined with an accessible melt processing window makes sulfonated LCPs attractive matrices towards preparing nanocomposites with improved thermal and mechanical properties
Sordi, D., De Ruijter, C., Orlanducci, S., Picken, S., Sudholter, J., TERRANOVA PERSICHELLI, M.l., et al. (2011). Sulfonated Liquid Crystalline Polyesters as Resin Matrix for Single Wall Carbon Nanotube and Nanodiamond Composites. JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY, 49, 1079-1087 [10.1002/pola.24519].
Sulfonated Liquid Crystalline Polyesters as Resin Matrix for Single Wall Carbon Nanotube and Nanodiamond Composites
ORLANDUCCI, SILVIA;TERRANOVA PERSICHELLI, MARIA LETIZIA;
2011-01-01
Abstract
The focus of this study is on incorporating pendant sulfonate groups along the backbone of a liquid crystalline polyester (LCPE) with the aim to improve the dispersion of single wall carbon nanotubes (SWNTs) and nanodiamonds (NDs). Two LCPE matrices, one sulfonated (LCPE-S) and one nonsulfonated reference polymer (LCPE-R), were successfully synthesized via a melt condensation method using aromatic and aliphatic AB, AA, and BB-type monomers. Upon the introduction of SWNT and ND particles, the glass transition temperature (Tg) of the sulfonated LCPE increased from 21.5 C to 41.0 C and 41.9 C, for SWNTs and NDs, respectively. When sulfonate groups were absent, a decrease in Tg was observed. The storage modulus (E0) followed a similar trend, i.e., E0 increased from 1.3 GPa to 5.2 GPa and 3.4 GPa, upon the addition of NDs and SWNTs. The LCPE-S showed a lower thermal stability due to the loss of sulfonate groups, i.e. the 5% weight loss temperature (T5% d ) is 280 C for LCPE-S vs. 333 C for LCPE-R. The decomposition temperature increased somewhat upon addition of the nanoparticles. The ability of dispersing carbonbased nanostructures combined with an accessible melt processing window makes sulfonated LCPs attractive matrices towards preparing nanocomposites with improved thermal and mechanical propertiesI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
