This book is a conversion of Ph. D. thesis titled, "Investigation of structural and mechanical properties of polymer-silica nanocomposite". This book will be helpful to the researchers in textile polymer nanocomposite area. It deals with the brief bibliographic revision concerning the most relevant topics related to needs of industrial textiles, composite materials, polymer nanocomposites and different methods to prepare polymer nanocomposite textiles, methods for testing and evaluation. Further it explains about the preparation of polymer silica nano composites like film, filament & fabric and the testing & analysis of these prepared nanocomposites for structural and mechanical performance.