Three polymorphic phases of Xaliproden are evidenced through thermal analysis: Form II has an orthorhombic symmetry while Forms I and III have monoclinic unit cells. Structural characterizations of Xaliproden are carried out by means of single-crystal and synchrotron powder X-ray diffraction (XRD), as well as high-resolution solid-state 13 C cross-polarization at magic angle spinning (CPMAS) nuclear magnetic resonance (NMR) spectroscopy. Diffraction crystallography indicates that the structures of two of the polymorphs are highly similar despite different thermal events observed by thermal analysis. Further X-13 C (X = 1 H or 19 F) CPMAS NMR spectra, recorded under either 1 H or double-resonance 1 H/ 19 F decoupling, provide evidence for the occurrence of 19 F self-decoupling in Form III, indicating that the structural disorder observed in the X-ray diagram is dynamic, with rotation of the CF 3 group around the C-C single bond. The results show that polymorphism between Xaliproden Forms I and III mostly deals with the degree of freedom of the CF 3 group, higher in Forms III than in Form I and clarifies the status of Form III that can therefore be assigned to a well-defined polymorph of Xaliproden.

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Current focus is on Natural fibre reinforced polymer composites with its advantages being eco-friendly in nature, high strength to weight ratio, being bio-degradable and naturally available when compared to its counterpart; synthetic fibres which is non-biodegradable, expensive and hazardous in nature. The strength of the natural fibre composites is further enhanced by different types of additives which includes fillers, flame retardants, silanes, coupling agents and so on. One such additives, in role is egg shell powder which greatly influences the strength of natural fibre composites and thus, gains the attention of researches for its incorporation in composite fabrication. The work is in progress with respect to utilizing waste egg shell in composite fabrication, which not only finds solution to discard this waste, but also enhances the strength of composites manufactured. This work is the compilation of work done by different researchers with egg shell in composites, so that the need of its utilization in the same will be clearer with its advantages with respect to achieving greater mechanical strength and wear resistant property and thereby it could be continued to be used as filler during composite production.

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