By E. Martuscelli, P. Musto, G. Ragosta
This quantity includes ten contributions which jointly supply an account of many of the methods used to enhance the sturdiness of polymer matrices. The correlations one of the molecular constitution of the elements, the morphology, and the mechanical houses of mix structures are emphasised, as are the equipment used to manage the constitution of those fabrics in the course of processing. a few subject matters, that are vital within the layout and formula of tricky polymer blends, comprise the function of the interface in multicomponent platforms, the chemical reactivity of the mixture elements, the mode and kingdom of dispersion of the second one section, the crystallinity and crystallization stipulations, and the glass transition temperature. additionally lined is the paintings which all started 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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Additional resources for Advanced Routes for Polymer Toughening
600 500 - 400 - E 300 - U 200 - / J 100 - 0 0 I I I 5 10 15 Blend Composition (g) Figure 17. Critical strain energy release rate, G c at low strain rate, as a function o f blend composition. 20 37 In attempting to toughen a brittle polymer, the main goal is to increase the toughness without significantly compromising other important properties such as the elastic modulus. The E values reported in Fig. 18 as a ftmetion of blend composition clearly demonstrate that the improved toughness is achieved without sacrificing the stit~ess of the epoxy matrix.
The toughening effect of PEI is further evidenced in Fig. 30, where G e, is reported as a function of blend composition. As for K~, a substantial increase of G c is found by increasing the PEI content in the blend in both the low and high speed tests. In particular, we found a tenfold increase of Gr at high speed and a 13-fold increase at low speed for a blend containing 19 wt. % of PEI. This enhancement in toughness is of the same order of magnitude as that obtained with bifunctional epoxies toughened by reactive liquid robbers [6,7].
28 In Fig. 10 is reported the FTIR transmission spectrum of the epoxy/MNA/ BDMA mixture at the beginning of the curing reaction. The MNA gives rise to several absorptions in the C-H stretching region which further complicate such a spectral range. A well resolved doublet at 1857 and 1781 cm-l appears, due to the symmetric and asynmaetric stretching vibrations of the anhydride carbonyls. o) and at 1083, 943, 929, 916, 899 cm-l (anhydride ring modes). Finally, at 798 crn-l a =CH out-ofplane deformation is found.