Advanced Routes for Polymer Toughening by E. Martuscelli, P. Musto, G. Ragosta PDF

By E. Martuscelli, P. Musto, G. Ragosta

ISBN-10: 0444819606

ISBN-13: 9780444819604

This quantity includes ten contributions which jointly supply an account of many of the techniques used to enhance the durability of polymer matrices. The correlations one of the molecular constitution of the parts, the morphology, and the mechanical homes of combination structures are emphasised, as are the equipment used to manage the constitution of those fabrics in the course of processing. a few themes, that are integral within the layout and formula of difficult polymer blends, contain the function of the interface in multicomponent structures, the chemical reactivity of the mix elements, the mode and nation of dispersion of the second one section, the crystallinity and crystallization stipulations, and the glass transition temperature. additionally lined is the paintings which begun within the early Nineteen Seventies with the chemical amendment of ethylene-propylene copolymers for use as tougheners of Polyamide-6. Double-spaced. B&w illustrations.

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The toughening effect of PEI can be ascribed to the capacity of the PEI phase to the plastically deformed under loading. The fracture surfaces of different epoxy/PEI blends broken at low speed were examined by scanning electron microscopy. To obtain further details, these surfaces were etched with a solvent of the PEI component (CHCI3) prior to examination. The 54 micrographs of both the unetched and etched surfaces are reported in Figs. 32 and 33 for comparison. 32A, 32B) the thermoplastic component segregates into spherical domains with diameters of about 2-3 Ixrn, uniformly distributed within the matrix.

Therefore, yielding of the thermoplastic continuous phase is the main toughening mechanism. At the intermediate compositions (see Figs. 32C, 32D) both the types of failure processes are active. In addition to the above discussed toughening mechanisms, other deformation processes have been proposed to explain the improvement in tougheness for thermoplastic modified epoxies such as crack-pinning [52-54], crack-path deflection [55], microcracking [56-60] etc.

In this case the solvent used was CH2CI 2. 8 mol %. Both the epoxy and carbonyl group reductions are consistent with the proposed reaction schemes. 2 mol of carbonyl groups was consumed. 2 mol. 27 The fact that the number of epoxy groups consumed is about twice the number of carbonyl groups seems to indicate that PC chain-seission occurs preferentially through the reaction scheme A. In any ease the formation of structures of type I is extremely important in the subsequent curing processes; in fact the epoxy functionalities at the end of the PC chains will take part in the crosslinking reactions, thus incorporating PC backbones within the epoxy network.

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Advanced Routes for Polymer Toughening by E. Martuscelli, P. Musto, G. Ragosta


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