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epreuve dhistoire geo brevet pdf


Van der Waals Bond . The van der Waal bonds occur to some extent in all materials but are particularly important in plastics and polymers. These materials are made up of a long string molecules consisting of carbon atoms covalently bonded with other atoms, such as hydrogen, nitrogen, oxygen, fluorine. Thermosetting vs thermoplastic polymers in terms of intermolecular force Hofuf Thermosetting polymers that include epoxy, unsaturated. 296 compatible blends with different thermoplastic and thermosetting resins. At higher temperature, however, the intermolecular force of attra ction. 461 losses due the phase separation of epoxy and NBR due to the incompatibility arising.