Infrared spectra of the stereoisomers of pentane‐2,4‐diol as a model for polyvinyl alcohol

Nagai, Eiichi; Kuribayashi, Shunsuke; Shirai, Masaru; Ukita, Minoru

doi:10.1002/pol.1959.1203512833

Cited by 37 publications

(4 citation statements)

References 5 publications

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“…The macromolecules of atactic poly(vinyl alcohols) in water are known 43,85,86 to tend to associate, whereupon the intermolecular hydrogen bonds arise mainly with participation of the OH groups of the syndiotactic (s) PVA blocks while the intramolecular hydrogen bonds are produced with participation of the OH groups of the isotactic (i) fragments.…”

Section: Dependence Of the Properties Of Poly(vinyl Alcohol) Cryogels...mentioning

confidence: 99%

Cryotropic gelation of poly(vinyl alcohol) solutions

1998

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Section: Dependence Of the Properties Of Poly(vinyl Alcohol) Cryogels...mentioning

confidence: 99%

Cryotropic gelation of poly(vinyl alcohol) solutions

1998

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“…This structure had been used without any doubt for a long time in the discussion of PVA–BA cross-linkages. However, we must notice here that the PENT compound with BA exists in the two kinds of polymorph: the monoclinic and orthorhombic forms, − among which the monoclinic-type crystal was analyzed by Kuribayashi et al as mentioned above . No X-ray structure analysis had been conducted for the orthorhombic-type crystal.…”

Section: Introductionmentioning

confidence: 99%

Clarification of Cross-Linkage Structure in Boric Acid Doped Poly(vinyl alcohol) and Its Model Compound As Studied by an Organized Combination of X-ray Single-Crystal Structure Analysis, Raman Spectroscopy, and Density Functional Theoretical Calculation

et al. 2014

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When boric acid (BA) is added to poly(vinyl alcohol) (PVA), a chemical reaction occurs to form the cross-linkages between the amorphous PVA chains. The local structural change caused by this reaction has been clarified concretely from the microscopic level on the basis of the X-ray-analyzed crystal structure, Raman spectra, and ab initio density functional theory using a model compound produced by the reaction between pentanediol (PENT) and boric acid (PENT-BA). The PENT-BA compound was found to take the TT and TG conformations in the methylene segmental parts depending on the stereoregularity of the PENT molecule itself, meso and racemo configurations, respectively. These two conformations give the Raman bands at the different positions. By comparison of the Raman spectra between the PVA-BA and PENT-BA model compounds, the local structures of PVA chains connected to BA molecules have been derived concretely: the syndiotactic PVA parts in the amorphous region form the TG-type ring structure with the 3-coordinate boron atom, where T and G are trans and gauche conformers, respectively. On the other hand, the isotactic PVA part takes the TT conformation when it forms a ring with boron atom. The thus-created rings are hydrogen-bonded to form a dimer, which plays a role as cross-linkage between the neighboring PVA chain segments in the amorphous region.

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“…and was supported by studies with pentane-2,4-diol, 14 where it was shown that the isomer with both hydroxyl groups on the same side of the plane of the carbon atoms possessed a band observed at 1157 cm-l that increased markedly in intensity under conditions (i.e. in dilute carbon disulphide solution) that favoured the formation of intramolecular hydrogen bonds.…”

Section: Introductionmentioning

confidence: 87%