Design of Soft Materials from Liquid Triblock Co-Oligomers and Metal Nanoparticles

作者：Pletsch Holger; Schnepf Max J; Agarwal Seema^*

来源：Chemistry of Materials, 2014, 26(16): 4805-4811.

DOI：10.1021/cm502322g

Thermally processable soft material networks with adjustable mechanical properties made from very low molar mass alpha,omega-dithiol functionalized ABA triblock co-oligomers (alpha,omega-dithiol oligo(isoprene-b-styrene-b-isoprene) (TISIT)) using AgNP as thermally reversible cross-linking points are highlighted in the present work. Liquid TISIT oligomers were synthesized by sequential anionic polymerization and subsequently cross-linked with AgNP. Low molar masses (4200-4800 g mol(-1)) were engaged, assuring disordered microstructures and therefore, low viscosities at elevated temperatures. Smooth films with homogeneous nanoparticle distributions of the resulting quasi-segmented soft material networks (TISIT@AgNP) were made by heat pressing. The interplay of styrene and AgNP as the structure-supplying portions in TISIT@AgNP samples facilitates access to materials with tensile strengths up to 5.58 MPa, toughness up to 13.3 MN mm(-2), and tensile moduli up to 80.1 MPa at room temperature and strongly decreased elasticity and viscosity at elevated temperatures, even below the glass transition temperature of polystyrene.

• 出版日期2014-8-26