| 초록 |
A series of elastomeric nanocomposites with highly enhanced tensile modulus was prepared by dispersing TEMPO-oxidized individualized cellulose nanofibers (TOCNs) grafted with poly(styrene) (PS) chains via ionic bonds in a styrenic blockcopolymer. The PS-grafted cellulose nanofibers dispersed in chloroform. Then, the solution of PS-grafted TOCN (0.5–2.0 wt % TOCNs and 2.0–7.8 wt % PS in the composites)/SIS (14.0 wt % PS) in chloroform were casted and dried to prepare the composite films. With only 2.0 wt % TOCNs incorporated, 11.6-fold increase in Young’s modulus (31.4 MPa) and a decrease of 58% in the coefficient of thermal expansion were achieved, notwithstanding some sacrifice in tensile strength and strain at break. Moreover, attractive interaction mediated likely to be formed between the PS-grafted TOCN and PS domains of SIS, which was determined using TEM, SEM, and SAXS compared to those of the composite having the SIS and PS without TOCN. |
