Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/43286
DC FieldValueLanguage
dc.contributor.authorWu, T.M.en_US
dc.contributor.author吳宗明zh_TW
dc.date2001zh_TW
dc.date.accessioned2014-06-06T08:10:30Z-
dc.date.available2014-06-06T08:10:30Z-
dc.identifier.issn0887-6266zh_TW
dc.identifier.urihttp://hdl.handle.net/11455/43286-
dc.description.abstractX-ray methods were used to investigate the structure of Vectra(R) and Xydar(R) polyesters. Xydar(R) is based on the aromatic polyester prepared from p-hydroxy-benzoic acid (HBA), terephthalic acid, and biphenol. Vectra(R) consists of HBA and 2-hydroxy-6-naphthoic acid. X-ray fiber diagrams of these materials consist of a series of nonperiodic layer lines, which are consistent with a structure consisting of parallel chains of a random comonomer sequence. The meridional peak positions are predicted accurately for fully extended, infinite chains, and the observed and calculated intensities are also in reasonably good agreement. However, there is a less adequate match between the observed and calculated peak profiles, which are predicted to be much sharper than those observed. The latter agreement is improved with a model consisting of finite chain segments with a slightly nonlinear (sinuous) conformation. The best agreement for the observed peak profiles is obtained with an ordered segment length of 90 +/-6 Angstrom and a sinuosity of g = 3.67 +/-0.08% for Vectra(R) fibers and with an ordered segment length of 104 +/-6 Angstrom and a sinuosity of g = 3.33 +/-0.08% for Xydar(R) fibers. (C) 2001 John Wiley & Sons, Inc. J Polym Sci Part B: Polym Phys 39: 1839-1847, 2001.en_US
dc.language.isoen_USzh_TW
dc.relationJournal of Polymer Science Part B-Polymer Physicsen_US
dc.relation.ispartofseriesJournal of Polymer Science Part B-Polymer Physics, Volume 39, Issue 16, Page(s) 1839-1847.en_US
dc.relation.urihttp://dx.doi.org/10.1002/polb.1158en_US
dc.subjectVectra (R)en_US
dc.subjectXydar (R)en_US
dc.subjectX-ray diagramen_US
dc.subjectpolyesteren_US
dc.subjectrandom comonomeren_US
dc.subjectsequenceen_US
dc.subjectaxial correlation lengthen_US
dc.subjectparacrystalline distortionen_US
dc.subjectliquid-crystalline copolyestersen_US
dc.subjectx-ray-analysisen_US
dc.subject2-hydroxy-6-naphthoicen_US
dc.subjectaciden_US
dc.subjectparacrystalline distortionen_US
dc.subjecthydroxybenzoic aciden_US
dc.subjectatomic modelen_US
dc.subjectdiffractionen_US
dc.subjectcopolyimidesen_US
dc.subjectcopolyamideen_US
dc.subjectcopolymersen_US
dc.titleAxial correlation lengths for aromatic copolyestersen_US
dc.typeJournal Articlezh_TW
dc.identifier.doi10.1002/polb.1158zh_TW
item.cerifentitytypePublications-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.languageiso639-1en_US-
item.fulltextno fulltext-
item.grantfulltextnone-
item.openairetypeJournal Article-
Appears in Collections:材料科學與工程學系
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