Synthesis and Characterization of Crosslinked Castor Oil-Based Polyurethane Nanocomposites Based on Novel Silane-Modified Isocyanate and Their Potential Application in Heat Insulating Coating

Abstract

An isocyanate with trimethoxysilane groups at the side chains (IPDI-M) was synthesized via an addition between the mercaptopropyl trimethoxysilane groups (MPTMS) and IPDI tripolymer (IPDI-T). Then, silane grafted isocyanate as the functional hard segment, castor oil as the soft segment, poly (ethylene adipate) diol (PEA) as the chain extender, and MPTMS as an end-capping reagent were applied to form a series of organosilicon hybrid bio-based polyurethane (CPUSi). The effect of the IPDI-M contents on the thermal stability, mechanical properties, and surface properties of the resulting product was systematically investigated. Profit from the Si–O–Si crosslinked structures formed from MPTMS curing, the tensile strength, and Young’s modulus of the resulting products increased from 9.5 MPa to 22.3 Mpa and 4.05 Mpa to 81.59 Mpa, respectively, whereas the elongation at break decreased from 342% to 101%. The glass transition temperature, thermal stability, transparency, hydrophobicity, and chemical resistance were remarkably strengthened for the obtained organosilicon-modified polyurethane with the increasing MPTMS content. At the end of the work, the thermal insulation coating that was based on CPUSi and ATO can effectively block near-infrared rays, and the temperature difference between the inside and outside of the film reached 15.1 °C.

A Study on the Preparation and Cavitation Erosion Mechanism of Polyether Polyurethane Coating

“…The thermal stability of the PU x was investigated by thermogravimetric analysis (TGA) test and shown in Figure 5. All samples contained two thermal decomposition peaks, indicating that there were two thermal decomposition processes for this type of material, where the low temperature region corresponded to the decomposition process of the hard segment and the high temperature region corresponded to the decomposition process of the soft segment [31,32]. However, the difference between the two thermal decomposition peaks was not obvious, meaning that the microphase separation degree of this polyether polyurethane was slight.…”

High performance flexible triboelectric nanogenerators using bio-derived films made of siloxane-modified castor oil

“…14,15 Increasing the siloxane concentration in the hybrid materials results in enhanced mechanical and thermal properties, as well as antibacterial activity, and in vitro hydrolytic degradation. An organosilicon hybrid polyurethane from silane graed isocyanate and castor oil was reported in another study, 16 wherein the silica component in the hybrid material signicantly improved the thermal and mechanical properties. A non-leachable antibacterial gelatin lm based on silanefunctionalized castor oil, wherein the inorganic silicon domain in the organic framework improved the mechanical properties of the hybrid material, has been also recently developed 17 highlighting the crucial role of the siloxane group in improving the properties of bio-based hybrid materials.…”

Effect of crosslink density on Sealant Properties Based on Silane- Modified Polyurethane

“…These reactions involve the interaction of silanol groups, formed through the hydrolysis of the silane compounds, with the remaining hydroxyl groups on the polyol [11][12][13]. This dual reactivity of amino silanes introduces a nuanced balance in the curing process, in uencing the overall crosslinking density and, consequently, the material properties [14,15].…”