Abstract
In monofilaments of poly(tetramethylene terephthalate) the chain conformation changes reversibly between two forms as the fibre is strained. Both forms and their packing have been determined using the techniques of X-ray diffraction. In the unstrained form the methylene section of the chain has the conformation gauche-trans-gauche; on straining this changes to trans-trans-trans. The consequences of this change on other structural parameters are discussed in detail.
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