Heat and fire resistance of polyurethane‐polydimethylsiloxane hybrid material

Abstract

This work examines the synthesis of polyurethane (PU)—polydimethylsiloxane (PDMS) hybrid in order to provide low flammability to PU. Chemical characterization of PU/PDMS hybrid by solid state NMR of carbon and FT‐IR shows that some PDMS segments are incorporated in the macromolecular chains of PU. Heat stability of PU (thermo‐oxidative decomposition) is not enhanced by the incorporation of PDMS except that the amount of the high temperature residue is improved and depends on the amount of PDMS incorporated in the PU chains. It is explained by the formation and the accumulation of silica. On the contrary, thermal stabilization (charring) occurs in the pyrolytic conditions when incorporating PDMS. The accumulation of silica as well as charring enhancement enables the flammability properties of the PU/PDMS hybrid to form a protective layer limiting heat transfer between the flame and the substrate. The heat release rate measured by cone calorimetry of PU/PDMS hybrid is significantly decreased compared to virgin PU and temperature of the back of the sample is comparatively low compared to virgin PU. Copyright © 2006 John Wiley & Sons, Ltd.

Chemical structure, thermal properties, and free‐surface energy parameters of coatings synthesized from poly(urethane‐dimethylsiloxane) anionomers

“…Generally, the properties of coatings which were obtained at 3-stage method (Samples Nos. [13][14][15][16] are weaker, what probably results from the less molecular weight of the poly(urethane-siloxane) obtained at 3-stage method than at 4-stage method. To confirm that assumption more investigation are needed.…”

“…13,14,15 Previous research on the synthesis of the poly(urethane-dimethylsiloxane) polymers have mainly concerned an improvement in mechanical properties and thermal stability of that polymers. [16][17][18][19][20] Two articles 18,19 depict an interesting comparison of the measurement between water contact angles of polyurethane elastomer coatings with waterborne polyurethane, modified with aminoethylaminopropylsubstituted polydimethylsiloxane. In both cases, the increase in the water-contact angle of the polymer coatings with the increasing amount of the incorporated polydimethylsiloxane was observed.…”

Study of thermal stability and degradation kinetics of polyurethane–ureas by thermogravimetry

“…Polyurethanes (PUs) are among the most useful commercial classes of polymers which are widely used in both engineering and consumer products like coatings, adhesives, reaction molding plastics, fibers, foams, rubbers, thermoplastic elastomers, and composites [1,2]. Polyurethane elastomers (PS) show excellent mechanical and elastic properties because of their microphase separated structure [3], but they have low thermal stability.…”

Polyurethane/amino‐grafted multiwalled carbon nanotube nanocomposites: Microstructure, thermal, mechanical, and rheological properties

“…Polyurethanes with good mechanical and thermal properties can be prepared from nonpolar macrodiols, such as PDMS diol, and polyether polyols such as (PTMG), as polar diol . Siloxane‐based polyurethanes (PUS) are an important class of polymer materials for a variety of applications . Different research groups have focused on incorporation of different fillers, such as TiO 2 , SiO 2 , ZnO, clay, and especially CNT nanoparticles to improve properties of polyurethanes …”