Sequence distribution of partially hydrolyzed poly(vinyl acetate)

Tubbs, Robert K.

doi:10.1002/pol.1966.150040316

Cited by 100 publications

(50 citation statements)

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“…The structure of PVA is given in Figure 3. The extent of hydrolysis and content of acetate groups in PVA affect the crytallizability and solubility of PVA [33]. PVA is soluble in highly polar and hydrophilic solvents, such as water, Dimethyl Sulfoxide (DMSO), Ethylene Glycol (EG), and N-Methyl Pyrrolidone (NMP) [34].…”

Section: Polyvinyl Alcohol (Pva)mentioning

confidence: 99%

Water Soluble Polymers for Pharmaceutical Applications

2011

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Advances in polymer science have led to the development of novel drug delivery systems. Some polymers are obtained from natural resources and then chemically modified for various applications, while others are chemically synthesized and used. A large number of natural and synthetic polymers are available. In the present paper, only water soluble polymers are described. They have been explained in two categories (1) synthetic and (2) natural. Drug polymer conjugates, block copolymers, hydrogels and other water soluble drug polymer complexes have also been explained. The general properties and applications of different water soluble polymers in the formulation of different dosage forms, novel delivery systems and biomedical applications will be discussed.

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Section: Polyvinyl Alcohol (Pva)mentioning

confidence: 99%

Water Soluble Polymers for Pharmaceutical Applications

2011

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“…The sequence probability of noncrystallizable units, P OAC,OAC , can be defined10 as Note that (OH) + (OAC) = 1, but P OH,OH + P OAC,OAC is not necessarily equal to 1). It is possible to determine the number‐average sequence length L OH by11 Similarly, the blockiness factor, η, is defined as Equations (3) and (5) hold for both theories.…”

Section: Resultsmentioning

confidence: 99%

Melting behavior and surface morphology of poly(vinyl acetate‐co‐vinyl alcohol) copolymer

Thombre

2002

J of Applied Polymer Sci

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ABSTRACT:In a study of the surface morphology of commercial poly(vinyl acetate-co-vinyl alcohol) (ACA copolymer) with different percents of hydrolysis, different structures like fibrils, spherulites, micelles, vesicles, and spheroids were seen. The copolymer was crystallized by annealing at two different temperatures. The morphology of the polymer after crystallization and also without crystallization was studied. A decrease in the melting temperature just by heating to the melting temperature was observed, and for a detailed study, repetitive heating of the copolymer was carried out and changes in the mass and heat of fusion after every heating was recorded. The morphology of the copolymer after repetitive heating was studied.

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“…Indeed, the presence of hydroxyl groups affects significantly the film permeability because of the Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/memsci increase of the crystallinity degree related to EVOH. Moreover, the melting temperature of semicrystalline EVOH copolymers decreases when residual VA groups are present [27]. The hydroxyl groups in the VOH segments (Fig.…”

Section: Introductionmentioning

confidence: 97%