Fibre Structure - download pdf or read online

By MIshra, Siba Prasad

ISBN-10: 9385059130

ISBN-13: 9789385059131

ISBN-10: 9385059637

ISBN-13: 9789385059636

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Crystalline structure is that structure which exhibits a typical x-ray diffraction pattern. The most stable arrangement or ordered arrangement can be achieved by proper placement of atoms or atomic groups in like manner. Because of the valence angle of the carbon atoms, the molecular chains are placed either in a zigzag manner or in a helical manner. For an assemblage of close rod like molecules of zigzag structure, the closest packing can be achieved by stacking the rods with their axes parallel to each other.

Those are: (1) mean square end-to-end distance and/or (b) mean square radius of gyration. The value of radius of gyration will lead to the evidences of different conformations of the polymer chain. 12 Model of a molecular chain A polymer molecule is a big molecule composed of many small molecules chemically joined together. The molecular chains are flexible and the instantaneous shape of a polymer chain is referred as its conformation. Because of its flexibility, the molecule can be randomly coiled in the collapsed state and can be opened up progressively by stretching towards its limiting maximum extension.

The repeat unit of cellulose is the cellobiose. Cellobiose is β-glucosidogluco pyranose, formed by two units of glucose. β (1–4) linked anhydro glucose units, with a rotation of 180° around the chain axis for subsequent ring unit forms the cellobiose unit. The identity period has to be at least two or a multiple of two glucose units long. The molecule itself is stiff and straight because of its internal hydrogen bonds and the α linkage. The non-bonded hydroxyl groups on a single molecule will tend to form hydrogen bonds with acceptor compounds coming nearer than 3 Å.

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Fibre Structure by MIshra, Siba Prasad

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