Synthesis and dynamic mechanical behavior of crosslinked copolymers and IPNs from vegetable oils

Abstract

Crosslinked copolymers and IPNs were synthesized from vegetable oils (e.g., cottonseed oil, castor oil, and tung oil). The dynamic mechanical behavior of the polymer blends was studied by Dynamic Mechanical Spectroscopy (DMS). The tan ␦-temperature curves of these kinds of copolymers and IPNs show a single peak, which indicate good compatibility. They represent a kind of damping materials with high tan ␦ values over wide temperature ranges. Thus a new way has been found to use natural products of agriculture to produce damping materials. Effects of various factors on the dynamic mechanical behavior were studied.

Castor oil as a renewable resource for the chemical industry

“…Castor oil as such, after hydrogenation, or transesterification with glycerol or modification with linseed oil, or in combination with PEG, was extensively used as precursor in the preparation of IPN, as recently reported and reviewed [135][136][137][138]. The first step of this process consisted in the preparation of a PU component, which involved the use of different isocynates, such as TDI, isophorone diisocynate, and HMDI.…”

Aging of biodegradable oils and assessment of their suitability for high voltage applications

“…Comparatively few papers exist detailing the dielectric properties of vegetable oils [1][2][3][4][5][6][7][8][9][10][11]. The remainder focus instead on their role as lubricants and consequently, have an emphasis on their mechanical properties [12][13][14][15][16][17][18][19][20]. To solve the pour point problem requires the selection of appropriate additives [2,4,19], whilst the addition of antioxidants and the use of hermetically sealed installations can limit the effects of oxidation [1,5].…”

“…Oxidation of vegetable oils can either be carried out chemically [13][14][15][16] or by aging the oil in an oxidizing atmosphere [6,[17][18][19]. Whilst the reported end result of aging (i.e.…”

“…Whilst the reported end result of aging (i.e. increased viscosity and dielectric loss and reduced breakdown strength) would clearly not be beneficial in a high voltage transformer, Yin et al [13] details a method whereby vegetable oils may be converted into useful solid materials suitable for mechanical damping applications. Zlatanic et al [14] also reports on similar chemically induced cross-linking in six functionalized vegetable oil systems.…”

Ring‐opening metathesis polymerization of a modified linseed oil with varying levels of crosslinking

“…This high degree of unsaturation gives these macromolecules potential for functionalization and subsequent polymerization to form a highly crosslinked polymer matrix. Polymers have been made from soybean,5–8 corn,9 tung,10, 11 linseed,12–15 and castor oil,16, 17 among others, and many approaches to polymerization have been utilized including cationic,18–20 free radical,21, 22 thermal,23, 24 UV‐initiated,25 and ring‐opening polymerization 26. Strangely, transition metal‐based catalysts have yet to assert themselves as a force in vegetable oil bulk polymerization, despite the continual development of novel catalyst complexes that can produce high‐yielding, stereoregular, regioregular, monodisperse, and living polymers, often under mild reaction conditions.…”