Characterization of poly(vinyl alcohol—acetate) by 13C n.m.r. and thermal analyses

Bugada, Daniele C.; Rudin, Alfred

doi:10.1016/0032-3861(84)90248-9

Cited by 40 publications

(16 citation statements)

References 25 publications

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“…The main features of the 13 C NMR spectra for ACA copolymer have been described elsewhere. [7][8][9][10][11] The most interesting region of the sequence distribution is that of the methylene re-gion. Figure 1 shows the 13 C NMR spectra of the methylene region (38 -46 ppm) for three ACA copolymers (A, B, and C) with different degrees of hydrolysis by saponification, but the starting materials PVAC prepared by solution polymerization.…”

Section: Nmr Analysismentioning

confidence: 99%

Self‐association through hydrogen bonding and sequence distribution in poly(vinyl acetate‐co‐vinyl alcohol) copolymers

Garnaik

Thombre

1999

J. Appl. Polym. Sci.

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Correlation between hydrogen-bonding self-association and sequence distribution in poly(vinyl acetate-co-vinyl alcohol) copolymers (ACA) with different degrees of basic hydrolysis and sequence distributions has been studied by thermal analysis and NMR spectroscopy. 13C NMR spectroscopy has also been used to elucidate the blocky nature, branching, and tacticity of the copolymers. Thermal analytical studies indicate that hydrogen bonding distribution in block alcohol and vinyl acetate copolymers strongly depend on the sequence distribution wherein hydroxyl-hydroxyl self-association is preferred.

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Section: Nmr Analysismentioning

confidence: 99%

Self‐association through hydrogen bonding and sequence distribution in poly(vinyl acetate‐co‐vinyl alcohol) copolymers

Garnaik

Thombre

1999

J. Appl. Polym. Sci.

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“…These three signals, therefore, can be assignable to the three compositional dyads of (VA,VA), (VA,VL) and (VL,VL) in order of decreasing frequency, where VA, and VL denote vinyl alcohol unit and vinyl levulinate unit, respectively. The chemical shift dependence on the degree of esterification is very much similar to those of vinyl alcohol-vinyl acetate copolymers [47,48,[51][52][53][54][55] and vinyl alcohol-vinyl propionate copolymers [56].…”

Section: Reaction Timementioning

confidence: 69%

“…The corrected I(VL,VL) value is then, IðVL; VLÞ Z fIðVL; VLÞ C I CH 2 ðeÞg ÿ I CH 2 ðdÞ By using Eq. (2) and (3) a quantitative description of sequential distribution and randomness in VA-VL copolymer may be made [47,52,55].…”

Section: Vlc and Dyad Sequence Analysis Of Va-vl Copolymers By 13 C Nmrmentioning

confidence: 99%

N,N-dicyclohexylcarbodiimide assisted synthesis and characterization of poly(vinyl alcohol-co-vinyl levulinate)

Wang

Ikeda

Hori

et al. 2005

Polymer

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“…The determination of released PVA was carried out spectrophotometrically according to the method of Bujanda and Rudin [6]. Each hydrogel was immersed in 30 ml of distilled water, for 98 h at 37 °C.…”

Section: Releasing Testsmentioning

confidence: 99%

Biological characterization of hydrogels of poly(vinyl alcohol) and hyaluronic acid

Guerra

Cascone

Barbani

et al. 1994

J Mater Sci: Mater Med

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Hydrogels of hyaluronic acid (HA) and poly(vinyl alcohol) (PVA) were prepared using eight freezing-thawing cycles from HA/PVA blends (10/90, 20/80, 30/70, 40/60, 50/50, and 0/100 (w/w) ratios). The biocompatibility of the hydrogels was tested by means ofin vitro cytotoxicity and cytocompatibility tests using cell culture techniques. The release with time of HA and PVA, the two hydrogel components, ion aqueous medium was also monitored and evaluated. The results indicate that all the hydrogels are not cytotoxic, while cell adhesion was very scarce in PVA and was not improved by the addition of HA. The release kinetics of HA and PVA from the hydrogels were different. After 2 h, HA percentages from about 80 (10/90) blend) to 100% (20/80, 40/60 blends) were released from the hydrogels into the aqueous medium. In contrast, the percentages of released PVA remain lower in time compared with HA, reaching a plateau after 24 h and ranging from a maximum of about 13% (0/100 blend) to a minimum of about 6% (10/90, and 20/80 blends).

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Characterization of poly(vinyl alcohol—acetate) by 13C n.m.r. and thermal analyses

Cited by 40 publications

References 25 publications

Self‐association through hydrogen bonding and sequence distribution in poly(vinyl acetate‐co‐vinyl alcohol) copolymers

Self‐association through hydrogen bonding and sequence distribution in poly(vinyl acetate‐co‐vinyl alcohol) copolymers

N,N-dicyclohexylcarbodiimide assisted synthesis and characterization of poly(vinyl alcohol-co-vinyl levulinate)

Biological characterization of hydrogels of poly(vinyl alcohol) and hyaluronic acid

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