Possible routes for obtaining oriented fibres of the various known crystalline forms of syndiotactic poly(p-methylstyrene) are described. These routes include solvent diffusion and/or annealing on mesomorphic fibres. The X-ray fibre diffraction patterns show that form I, form II and all the clathrate forms are characterized by chains with helical s(2/1)2 conformation and repeating distance of approximate to 7.8 Angstrom, while the mesomorphic form (form IV), form III as well as a new crystalline form (form V), are characterized by chains with trans planar conformation and repeating distance of approximate to 5.1 Angstrom. Copyright (C) 1996 Elsevier Science Ltd.
Polymorphism of syndiotactic poly(p-methylstyrene): Oriented samples / DE ROSA, Claudio; V., Petraccone; G., Guerra; Manfredi, Carla. - In: POLYMER. - ISSN 0032-3861. - STAMPA. - 37:(1996), pp. 5247-5253. [10.1016/0032-3861(96)00353-9]
Polymorphism of syndiotactic poly(p-methylstyrene): Oriented samples
DE ROSA, CLAUDIO;MANFREDI, CARLA
1996
Abstract
Possible routes for obtaining oriented fibres of the various known crystalline forms of syndiotactic poly(p-methylstyrene) are described. These routes include solvent diffusion and/or annealing on mesomorphic fibres. The X-ray fibre diffraction patterns show that form I, form II and all the clathrate forms are characterized by chains with helical s(2/1)2 conformation and repeating distance of approximate to 7.8 Angstrom, while the mesomorphic form (form IV), form III as well as a new crystalline form (form V), are characterized by chains with trans planar conformation and repeating distance of approximate to 5.1 Angstrom. Copyright (C) 1996 Elsevier Science Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
