Influence of degree of crystallinity and syndiotacticity on infrared spectra of solid PVA

Sugiura, Kentaroh; Hashimoto, Morio; Matsuzawa, Shuji; Yamaura, Kazuo

doi:10.1002/app.1963

Cited by 42 publications

(31 citation statements)

References 27 publications

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“…As a kind of physical hydrogels, PVA hydrogels are joined together by both intermolecular and intramolecular hydrogen bonds. 23 These strong inner interactions are determined by various parameters such as molecular weight, stereoregularity, and fillers. 4,23,24 The characteristic peak at 22.92 ( Figure 4) indicates the PVA used here is atactic.…”

Section: Resultsmentioning

confidence: 99%

“…23 These strong inner interactions are determined by various parameters such as molecular weight, stereoregularity, and fillers. 4,23,24 The characteristic peak at 22.92 ( Figure 4) indicates the PVA used here is atactic. 25 The three hydroxyl res-onance lines in Figure 5 represent the isotactic (4.10 ppm), the herterotactic (4.33 ppm), and the syndiotactic (4.53 ppm) compositions of PVA, respectively, as reported previously.…”

Section: Resultsmentioning

confidence: 99%

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Functionalization of polyvinyl alcohol hydrogels with graphene oxide for potential dye removal

She

et al. 2013

J of Applied Polymer Sci

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Because of highly frozen macromolecule chains, polyvinyl alcohol (PVA) hydrogels have never been used for dye removal. This work focuses on improving the adsorption capacity of the PVA hydrogel by using amphiphilic graphene oxide to improve its macromolecular chain mobility in crystal domain and introduce new functional groups. To evaluate its effectiveness, crystal structure, swelling kinetics, and model dye methylene blue (MB) adsorption of the as-prepared PVA hybrid hydrogels were systematically investigated. The results indicate that the hybrid PVA hydrogels have lower crystallinity and less crystal stability, demonstrating the improved macromolecular chain mobility. Moreover, improved swelling ratios of PVA/GO hydrogels also illustrate the enhanced macromolecular chain mobility. MB adsorption experiment indicates that GO introduced can result in great improvement in MB adsorption. And the adsorption process follows the second-order kinetic model and Morris-Weber model, which is determined by the intraparticle diffusion. Furthermore, MB adsorption isotherm follows Freundlich model and the adsorption is heterogeneous. Desorption studies indicate that the interaction between PVA hydrogels and MB consists of both physisorption and chemisorption.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Functionalization of polyvinyl alcohol hydrogels with graphene oxide for potential dye removal

She

et al. 2013

J of Applied Polymer Sci

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“…The magnitude of the decrease for the drawn/saponified sample is smaller than that of the saponified/drawn sample. The intensity of the band at 916 cm −1 is reported to decrease with increase of the degree of crystallization 13–15. The crystals are suggested to be significantly resistant to heating.…”

Section: Resultsmentioning

confidence: 98%

Structure and properties of syndiotacticity-rich poly(vinyl alcohol) prepared through saponification of drawn poly(vinyl trifluoroacetate) with gaseous ammonia

Agawa

Wan

Tanigami

et al. 2001

J. Appl. Polym. Sci.

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The structure and properties of syndiotacticity‐rich poly(vinyl alcohol) (s‐PVA) prepared through the saponification of drawn poly(vinyl trifluoroacetate) (PVTFAc) with gaseous ammonia were studied. The PVTFAc samples with s‐diad % of 59 and 64 were used. The s‐PVAs had low densities and showed X‐ray diagrams similar to the fiber diagram of PVA with indistinct 100, 101, 101¯, and 200 plane reflections and without the plane reflections seen at the equator of a typical fiber diagram, such as 001, 201, and 002. The s‐PVAs had melting points comparable to those of saponified and heat‐drawn samples, indicating a PVA with the typical fiber structure as seen in the X‐ray diagram of a sample. The intensity of the 916 cm−1 band in the infrared spectrum related to syndiotactic diads decreased with drawing, suggesting an increase in the crystallinity. Crystals with more defects are thought to be produced in saponification. The s‐PVA films drawn 16 times and saponified had a Young's modulus and strength at break of 22 and 1.5 GPa for the sample from S‐59 and 14 and 1.2 GPa for the sample from S‐64, respectively. The crystallization‐sensitive band of 1145 cm−1 in the infrared spectra of the saponified samples was weak. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 467–474, 2001

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“…The structure of CPVA‐ g ‐BGE was confirmed by comparison of FTIR spectra with that of PVA and CPVA, as shown in Figure 1. For the sample of virgin PVA, the wide band around 3327 cm −1 was attributed to the presence of hydroxyl groups (OH), the absorption bands at 2938 and 1423 cm −1 were attributed to dissymmetrical stretching vibration and the symmetry bending vibration of (CH 2 ), the weak absorption band at 1709 cm −1 was attributed to the characteristic absorption peak of ester carbonyl (CO) due to residual acetate groups during manufacture of PVA from hydrolysis of polyvinyl acetate,15 the absorption band at 1139 and 1091 cm −1 corresponded to (CO) stretching vibration of crystalline and amorphous phase of PVA,16 and the absorption bands at 917 and 841 cm −1 were assigned to skeletal vibrations of PVA,17 which were all the characteristic absorptions of PVA.…”

Section: Resultsmentioning

confidence: 99%

Preparation and property of poly(vinyl alcohol) grafted with butyl glycidyl ether

Wei

2013

J of Applied Polymer Sci

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The crosslinked polyvinyl alcohol (CPVA) and alkyl chain grafted CPVA (CPVA-g-BGE) were prepared through the addition reaction of epoxy group of epichlorohydrin and butyl glycidyl ether (BGE) with the hydroxyl group of PVA. By FTIR and 1 HNMR analysis, BGE was confirmed to be grafted onto the molecular chain of PVA successfully. By grafting with BGE, the area of the stress-strain curves of CPVA increased, and the elongation at break increased remarkably with little drop of the tensile strength. Much rougher fractured surface with folds was observed, indicating the increased toughness of CPVA. The relaxation peak corresponding to the glass transition temperature (T g ) of CPVA shifted to low temperature with increasing grafting ratio of BGE. When compared with CPVA, the crystallization ability of CPVA-g-BGE decreased, indicating that although the intermolecular hydrogen bonding of PVA was weakened by grafting with alkyl chain, appropriate intermolecular association of alkyl chain facilitated the formation of physical entanglement of molecular chains to strengthen and toughen the PVA matrix. Ink contact angles of CPVA-g-BGE decreased with increasing grafting ratio of BGE, indicating the increasing compatibility of CPVA with ink, which was advantageous for PVA to be used as surface sizing agent in papermaking.

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Influence of degree of crystallinity and syndiotacticity on infrared spectra of solid PVA

Cited by 42 publications

References 27 publications

Functionalization of polyvinyl alcohol hydrogels with graphene oxide for potential dye removal

Functionalization of polyvinyl alcohol hydrogels with graphene oxide for potential dye removal

Structure and properties of syndiotacticity-rich poly(vinyl alcohol) prepared through saponification of drawn poly(vinyl trifluoroacetate) with gaseous ammonia

Preparation and property of poly(vinyl alcohol) grafted with butyl glycidyl ether

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