Thermoplastic polyurethane and nitrile butadiene rubber blends with layered double hydroxide nanocomposites by solution blending

Abstract

Polymer blending coupled with nanofillers has been widely accepted as one of the cheaper methods to develop highperformance polymeric materials for various applications. In the present work, dodecyl sulfate intercalated Mg-Al-based layered double hydroxide (DS-LDH) was used as nanofiller in the synthesis of polyurethane blended with nitrile butadiene rubber (PU/NBR; 1 : 1 w/w) nanocomposites, which were subsequently characterized. X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed the partial dispersion of Mg-Al layers in PU/NBR blends at lower filler content followed by aggregation at higher filler loading. In comparison to the neat PU/NBR blend, the tensile strength (156%) and elongation at break (21%) show maximum improvement for 1 wt% filler loading. The storage and loss moduli, thermal stability and limiting oxygen index of the nanocomposites are higher compared to the neat PU/NBR blend. Glass transition temperature and swelling measurements increase up to 3 wt% DS-LDH loading in PU/NBR compared to either neat PU/NBR or its other corresponding nanocomposites. XRD and TEM analyses indicate the partial distribution of DS-LDH in PU/NBR blends suggesting the formation of partially exfoliated nanocomposites. The improvements in mechanical, thermal and flame retardancy properties are much greater compared to the neat blend confirming the formation of high-performance polymer nanocomposites.

Ionic elastomers based on carboxylated nitrile rubber (XNBR) and magnesium aluminum layered double hydroxide (hydrotalcite)

“…The total amount of magnesium, aluminum, oxygen and carbon was taken as 100%, the atomic percentage of each element is given in Table 2. Based on the obtained data we could confirm that the ratio of magnesium to aluminum is approximately the same as stoichiometric ratio of the elements specified on the basis of chemical formula Mg 6 Al 2 (OH) 16 Table 2. XPS atomic content for hydrotalcite surface composition surface of the filler particles exceeds the expected value.…”

“…Ionic elastomers based on carboxylated nitrile rubber (XNBR) and magnesium aluminum layered double hydroxide (hydrotalcite) [5][6][7][8][9], acrylonitrile-butadiene rubber (NBR) [10], chloroprene rubber (CR) [11], silicone rubber (SR) [12,13], and polyurethane PU [14][15][16] and solution styrenebutadiene rubber (SSBR) [17]. However, in the literature, there is no information on the impact of high loadings of unmodified magnesium aluminum layered double hydroxide used as a filler and a curing agent on the crosslinking process in XNBR.…”

Intermediate Blends Infrastructure Materials Compatibility Study

“…3, the total solubility parameter of E0 is not far removed from the range of solubility parameters for most of the elastomer samples, which were obtained from various solubility studies. [35][36][37][38][39][40] Also shown in Fig. 3, the solubility matchup becomes more aligned as the ethanol concentration is increased, and for CE25a, the Total Hansen Solubility Parameter closely matches that of many of the elastomers, which indicates an increased potential for degradation via dissolution and extraction.…”

Property correlations for dynamically cured rice husk ash filled epoxidized natural rubber/thermoplastic polyurethane blends: Influences of RHA loading

“…The blending of TPU with other polymers has been widely studied with focus on the improvement of mechanical properties, wear resistance, thermal stability, toughness and other related properties. Various polymers, including poly (dimethyl siloxane) [7], polyolefines [8e13], polylactide [5], polyamide-10 [14], copolymer of styrene and acrylonitrile (SAN) [15], and nitrile butadiene rubber (NBR) [16] have been used in blends with TPU. Recently, innovative reactive blending of TPU and ENR gave a low hardness material with outstanding oil and heat resistance properties, combined with superior damping properties that could not be found in the pure TPU [17e20].…”