Thermal stability of gamma-irradiated polyurethane/POSS hybrid materials

Abstract

In this work, new version: we report essential data on the stability of gamma-irradiated polyurethanes chemically modified by octa(3-hydroxy-3-methylbutylmethylsiloxy) POSS (o-POSS) which varies from 2, 4, 6, 8 to 10 mass%. These hybrid materials were tested by isothermal (190°C) and nonisothermal (b = 2, 3.7, 5 and 10 K min -1 ) chemiluminescence, and the thermal stability of gamma-radiation-aged samples was correlated with the change in the nanofiller loading and absorbed dose. The compositions where inorganic phase is less than 6% show an increasing thermal strength as o-POSS concentration enhances. The other samples with higher nanoparticle content present less stability in respect of inferior homologous composition. The nonisothermal chemiluminescence profiles are changing from one type of sample to the other where nanofiller induces different effects. The considerations on mechanistic aspects are discussed, too.

Hybrid nanocomposites of elastomeric polyurethane containing halloysite nanotubes and POSS nanoparticles: tensile, hardness, damping and abrasion performance

“…In numerous studies, POSS was used effectively as a chain extender for the replacement of partial diol monomer at polymerization stage of polyurethane (Lewicki et al, 2014;Liu & Zheng, 2005;Lopes et al, 2012;Mahapatra et al, 2012;Markovic et al, 2013;Zhang et al, 2006;Zhang et al, 2011;Zhao et al, 2019). Moreover, POSS promotes flame retardancy (Bourbigot et al, 2009;Kavuncuoglu et al, 2019;Kim et al, 2014;Michalowski & Pielichowski, 2018), self-healing (ehera et al, 2018;Diao et al, 2015), scratch protection (Ghermezcheshme et al, 2015;Lai et al, 2009), thermal shielding (Carmo et al, 2014;Janowski & Pielichowski, 2008;Kannana et al, 2006;Liu et al, 2015;Pagacz et al, 2018;Spoljaric & Shanks, 2012;Szolyga et al, 2018;Zaharescu et al, 2018), hydrogel formation (Mather et al, 2006;Wu et al, 2010), drug releasing stent coating (Guo et al, 2009;Huitron-Rattinger et al, 2013) and thin film applications (Blattmann & Mulhaupt, 2016;Madbouly & Otaigbe, 2009;Oaten & Choudhury, 2005) as it was incorporated with polyurethane networks.…”

“…In previous studies, POSS was used effectively as a chain extender for the replacement of partial diol monomer at the polymerization stage of polyurethane (Liu & Zheng, 2005; Zhang et al , 2006, Zhang et al , 2011; Lopes et al , 2012; Markovic et al , 2013; Mahapatra et al , 2012; Lewicki et al , 2014; Zhao et al , 2019). Moreover, POSS promotes flame retardancy (Bourbigot et al , 2009; Kim et al , 2014; Michalowski & Pielichowski, 2018; Kavuncuoglu et al , 2019;), self-healing (Diao et al , 2015; Behera et al , 2018), scratch protection (Lai et al , 2009; Ghermezcheshme et al , 2015; Hebda & Pielichowski, 2018), thermal shielding (Kannana et al , 2006; Janowski & Pielichowski, 2008; Spoljaric & Shanks, 2012; Carmo et al , 2014; Liu et al , 2015; Pagacz et al , 2018; Szolyga et al , 2018; Zaharescu et al , 2018), hydrogel formation (Mather et al , 2006; Wu et al , 2010), drug-releasing stent coatings (Guo et al , 2009; Huitron-Rattinger et al , 2013) and thin-film applications (Oaten & Choudhury, 2005; Madbouly & Otaigbe, 2009; Blattmann & Mulhaupt, 2016) as it was incorporated in polyurethane networks. Recent advancements in HNT-polyurethane systems have also been postulated in several studies and reviews in which the polyurethane matrix was given specific properties including: shape memory (Bouaziz et al , 2019), corrosion resistance in protective coatings (Zahidah et al , 2017; Zeng et al , 2019), drug delivery (Hanif et al , 2016; Fizir et al , 2018), removal of pollutants from water (Anastopoulos et al , 2018; Papoulis, 2019) and thermal stability + fire-proofing (Tang et al , 2008; Smith et al , 2018).…”

Thermal properties of polyurethane-based composites modified with chitosan for biomedical applications

“…Another interesting feature is the microphase separation of hard and soft segments that significantly influence the properties of PU [6]. Typical chain extenders in PU synthesis are low-molecular-weight diols (HO-R-OH), such as 1,4-butanediol, diethylene glycol, ethylene glycol and 1,6-hexanediol, or diamines (NH 2 -R-NH 2 ), like 1,6-hexamethylenediamine and 1,2-ethylenediamine [2,7]. The introduction of chitosan to the polymer matrix as a chain extender/crosslinker is an attractive synthetic route for biomaterials as this polysaccharide enhances the growth of osteoblasts in materials for bone tissue engineering [8,9].…”

Stability Efficiencies of POSS and Microalgae Extracts on the Durability of Ethylene-Propylene-Diene Monomer Based Hybrids

“…The considerable interest on the polyhedral oligomeric silsesquioxane (POSS) hybrids for the extension of the potential application areas of plastics manufacture is inspired by many papers [ 1 , 2 , 3 ] as the appropriate candidates for high performance materials. The spatial structure of POSS is an opportune basic solution for the amelioration of thermal properties [ 4 , 5 ], as well as at the improvement of the durability, of host material [ 6 ]. The outstanding benefit of POSS hybrids is its environmental friendliness because their presence does not generate hazardous by-products [ 7 , 8 ], and it has a certain availability for functionalization [ 9 ].…”