Chemistry

Chemistry and Physics of Complex Materials: Concepts and by Maria Rajkiewicz, Wiktor Tyszkiewicz, Zbigniew Wertejuk

By Maria Rajkiewicz, Wiktor Tyszkiewicz, Zbigniew Wertejuk

This publication bargains a finished presentation of the suggestions, houses, and functions of advanced fabrics. Authors of every bankruptcy use a primary method of outline the constitution and homes of a variety of solids at the foundation of the neighborhood chemical bonding and atomic order found in the cloth. Emphasizing the actual and chemical origins of other fabric houses, this crucial quantity specializes in the main technologically vital fabrics being applied and built by way of scientists and engineers.

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Triglycerides are molecules with low reactivity and this fact is a disadvantage in their potential application in polymer synthesis. Nevertheless, the introduction of different functionalities in their reactive sites increases largely the synthetic possibilities of triglycerides [3]. ); 28 Chemistry and Physics of Complex Materials: Concepts and Applications (ii) as building blocks to get polymers from them; and (iii) as units for the thermosets synthesis. Much work on the use of vegetable oils as additives [6–11] and as thermosets precursors [12–18] has been reported, but the development of thermoplastic polymer matrices is still in an early stage of research.

The prepolymer synthesized in the first step and the calculated amount of polyol for a NCO/OH = 1 ratio were directly introduced in the feeding zone of an internal mixer (counter-rotating mixer Rheocord 9000, Haake, USA) equipped with a pair of high-shear roller-type rotors, at 80°C, with a rotation speed of 50 rpm and 15 min processing time. Then, the adequate amount of BDO chain extender was added and the temperature was immediately increased to 180°C for 8 min, without any catalyst. After polymerization, all systems were cured overnight in an oven at 70°C to ensure the complete reaction of NCO groups, which was further checked by attenuated total reflection Fourier-transform infrared spectroscopy (ATRFTIR).

This wide range of chemical methods applicable to these natural materials gives rise to many different monomers and polymers with many applications. 26 Chemistry and Physics of Complex Materials: Concepts and Applications Fatty acids are the major chemical entities present in vegetable oils. They are valuable compounds to design specific monomers in the search of polymers with particular properties without any need of important modifications in their native structure. This is an advantageous issue, not only in sustainability terms, but also in industrial applicability and competitiveness in terms of cost and properties [2–5].

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