Dynamic mechanical, mechanical and thermal analysis of CPI/NBR blends: effect of blend composition and crosslink density

Abstract

Blends of cis-polyisoprene (CPI) and nitrile butadiene rubber (NBR) in different volume ratio were prepared to see the effect of composition on different properties. Structure characterization has been done through X-ray diffraction and scanning electron microscope. Scanning electron micrographs confirm homogeneous nature of all the blends. The dynamic mechanical analyzer was used to measure damping, storage modulus, glass transition temperature and mechanical properties (Young's modulus and tensile strength) of these blends. Activation energy and fragility were determined for the non-Arrhenius (fragile) behavior of viscosity using Vogel-Fulchuer-Tammann (VFT) equation. Thermal conductivity has been analyzed through thermal constant analyzer. Results indicate that all the measured properties are dependent on blend composition and crosslink density.

Sericin cocoon bio-compatibilizer for reactive blending of thermoplastic cassava starch

“…[52,53] The relatively high amount of sericin (10 phr) enhanced the high crosslinking reaction inside the PEMAH phase (Fig. 7c), with an increased Young's modulus and maximum tensile strength [54,55] of TPSS10/PEMAH.…”

An experimental investigation on the matrix dependent rheological properties of MRE

“…The cross links are the topological constraints that decrease the number of accessible rotational degrees of freedom of the molecules. The cross link density is successfully employed as a base structure parameter to explain the properties of an elastomer (Baboo et al, 2016; Lei et al, 2020; Meinecke, 1991). It represents the number of network chains per unit volume.…”