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Download Microwave-Enhanced Polymer Chemistry and Technology by Dariusz Bogdal PDF

By Dariusz Bogdal

Whereas polymer know-how varieties one of many greatest parts of program of microwave know-how, and the equipment and systems used therein are one of the so much built, there's nonetheless a relative loss of released details at the subject.Microwave-Enhanced Polymer Chemistry and know-how describes novel ways to polymer processing utilizing microwave applied sciences. assurance comprises historical past and clinical information, research of tactics and product houses compared to present know-how, purposes which are getting used in numerous methods, and the prestige of present study. beneficial properties of microwave irradiation, i.e., solvent-free reactions, low waste, strength potency, excessive yield, brief response time, and attainable use of different solvents, can play a huge function within the improvement of eco-friendly chemistry tools.

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Example text

The figure (Fig. 4). As soon as the temperature of 70 °C is reached, the temperature program reduces the microwave power to a medium value of 350 W. When MMA was converted into PMMA, which ab- Overview of Polymerization Processes 45 Fig. 6. A bench-scale microwave polymerization reactor. , Dougar, V. 1998. Polymer 39:1471, with permission. , the microwave power is increased after 30 minutes from 350 W to 840 W after 48 minutes). However, under such conditions, no significant effect of microwave irradiation was detected, and molecular weights, polydispersities, stereoregularities, particle size, and their distribution were similar for both activation methods.

In most of these cases, special equipment was built to apply microwave irradiation. In the next chapters, detailed descriptions of many polymerization reactions and cross-linking, as well as processing under microwave conditions, are presented, but unlike in this chapter, microwave reactors, or at least a modified household microwave oven, were used. Because the effects of microwave irradiation on chemical reactions are generally evaluated by comparing the time needed to obtain a desired yield of final products with respect to conventional thermal heating, for this purpose, the syntheses run under microwave conditions were compared with conventional heating methods.

The polymerization of 2-phenyl-oxazoline in the presence of methyltosylate as a catalyst is an example of cationic ring opening polymerization, in which the charge is developed during the progress of the reaction and so, according to the previously mentioned concept of microwave irradiation, is supposed to accelerate the polymerization. In both reports, the polymerization reactions were carried out in an acetonitrile solution, which in turn as a polar solvent strongly interacts with microwaves and is supposed to mask or limit the influence of microwaves.

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