Untitled

Yeh, Jen‐Taut; Wang, Li-Hung; Chen, Kan-Nan; Jou, Wern-Shiarng

doi:10.1023/a:1017525304041

Cited by 5 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Copolymers of poly(vinyl alcohol) (PVA) are widely used as adhesives in coatings and packaging materials because of their excellent barrier properties toward hydrocarbons and gases. − Moreover, these hydrophilic synthetic resins have many biomedical applications. , The concentration of hydroxyl groups along the polymer chain determines its polarity and thus the barrier properties of the polymer. Ethylene–(vinyl alcohol) (EVOH) copolymers with higher vinyl alcohol content have better barrier properties .…”

Section: Introductionmentioning

confidence: 99%

One-Pot Synthesis of Poly(vinyl alcohol) (PVA) Copolymers via Ruthenium Catalyzed Equilibrium Ring-Opening Metathesis Polymerization of Hydroxyl Functionalized Cyclopentene

et al. 2014

View full text Add to dashboard Cite

Well-defined poly(vinyl alcohol-alt-propenylene) (4) was synthesized in one-pot reaction via equilibrium ring-opening metathesis polymerization (ROMP) or acyclic diene metathesis (ADMET) of nonprotected 3-cyclopentene-1-ol ( 2) and 1,6-heptadiene-4-ol using (1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene)dichloro(phenylmethylene)(tricyclohexylphosphine)ruthenium ( 6) and (1,3bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene)dichloro(oisopropoxyphenylmethylene)ruthenium ( 7) metathesis catalysts. The activation enthalpy and entropy of the equilibrium ROMP were determined as ΔH = −6.2 kcal mol −1 and ΔS = −18.9 cal mol −1 K −1 . The observed thermodynamic parameters were supported by computational studies. The calculated ring strain energy for 2 (−6.8 kcal mol −1 ) is comparable with the observed activation enthalpy for its equilibrium ROMP reaction catalyzed by 6 or 7. The cis:trans olefinic bond ratio analysis indicated a 20:80 cis:trans selectivity. The hydrogenation of 4 resulted in poly(vinyl alcohol-alt-propylene) (11) in high yield. Because of the similar ring strain energies of cyclopentene (1) and 2, the equilibrium copolymerization results in a polymer having randomly distributed dyads. In general, it means that the polymer formed contains approximately 50% alternating polymer, 25% 3, and 25% 4 homopolymer dyads as expected for a random polymerization.

show abstract

Section: Introductionmentioning

confidence: 99%

One-Pot Synthesis of Poly(vinyl alcohol) (PVA) Copolymers via Ruthenium Catalyzed Equilibrium Ring-Opening Metathesis Polymerization of Hydroxyl Functionalized Cyclopentene

et al. 2014

View full text Add to dashboard Cite

show abstract

“…In contrast to the coextrusion process, the laminar‐blend blow‐molding process forms a layered structure containing numerous discontinuous, overlapping platelets of barrier resins such as PA, poly(vinyl alcohol) (PVA), and ethylene vinyl alcohol (EVOH) in a PE matrix. This is one of the well‐proven barrier technologies used to enhance the resistance of PE containers to hydrocarbon permeation 9–12. Because PE/PA, PE/PVA, and PA/EVOH blends are thermodynamically immiscible and mechanically incompatible, compatibilizer precursor (CP) resins have often been used to improve the interfacial properties between PE and PA, PVA, and EVOH and to enhance the barrier properties of PE/PA/CP blends.…”

Section: Introductionmentioning

confidence: 99%

Oxygen permeation resistance of polyethylene, polyethylene/ethylene vinyl alcohol copolymer, polyethylene/modified ethylene vinyl alcohol copolymer, and polyethylene/modified polyamide–ethylene vinyl alcohol copolymer bottles

Yeh

Huang

Yao

et al. 2004

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

ABSTRACT:The oxygen permeation resistance of polyethylene (PE), polyethylene/ethylene vinyl alcohol copolymer (PE/EVOH), polyethylene/modified ethylene vinyl alcohol copolymer (PE/MEVOH), and polyethylene/modified polyamide-ethylene vinyl alcohol copolymer (PE/MPAEVOH) bottles was investigated. The oxygen permeation resistance improved significantly after the blending of ethylene vinyl alcohol copolymer (EVOH) barrier resins in PE matrices during blow molding; less demarcated EVOH laminas were found on the fracture surfaces of the PE/EVOH bottles. Surprisingly, the oxygen permeation resistance of the PE/ MEVOH bottles decreased significantly, although more clearly defined modified ethylene vinyl alcohol copolymer (MEVOH) laminas were found for the PE/MEVOH bottles as the compatibilizer precursor contents present in the MEVOH resins increased. In contrast, after the blending of modified polyamide (MPA) in EVOH resins, more demarcated modified polyamide-ethylene vinyl alcohol copolymer (MPAEVOH) laminar structures were observed in the PE/MPAEVOH bottles as the MPA contents present in the MPAEVOH resins increased. In fact, with proper MPAE-VOH compositions, the oxygen permeation resistance of the PE/MPAEVOH bottles was even better than that of the PE/EVOH bottles. These interesting oxygen barrier and morphological properties of the PE, PE/EVOH, PE/ MEVOH, and PE/MPAEVOH bottles were investigated in terms of the free volumes, barrier properties, and molecular interactions in the amorphous-phase structures of the barrier resins present in their corresponding bottles.

show abstract

Synthesis of water vapor barrier membrane by coating of poly(vinyl alcohol) substrate with poly(tert‐butyl acrylate)‐silica nanocomposite

Saito

Nakagawa

2008

Polymers for Advanced Techs

View full text Add to dashboard Cite

To prepare a water vapor barrier membrane, organic/silica nanocomposites were used with perhydropolysilazane (PHPS) and poly(tert‐butyl acrylate) (P(tBA)) or poly(tert‐butyl acrylate‐co‐2‐hydroxyethyl methacrylate) (TBAH) on a poly(vinyl alcohol) (PVA) substrate. Water vapor permeability coefficient, Q, of the coated PVA substrates was measured. To prevent crack formation in the organic/silica nanocomposite layer, P(tBA) or TBAH with lower Tg than that of PVA was inserted as a stress relaxation layer between the PVA substrate and the composite layer. The insertion of the stress relaxation layer drastically decreased the Q value. The lowest Q value was observed especially when TBAH was inserted between TBAH/silica nanocomposite layer and the PVA substrate. Observation with a scanning electron microscope (SEM) did not show any crack both in the composite layer and near the interface between layers. It would be due to the good compatibility of the TBAH stress relaxation layer to the TBAH/silica nanocomposite layer and to the PVA substrate. Copyright © 2008 John Wiley & Sons, Ltd.

show abstract

Untitled

Cited by 5 publications

References 6 publications

One-Pot Synthesis of Poly(vinyl alcohol) (PVA) Copolymers via Ruthenium Catalyzed Equilibrium Ring-Opening Metathesis Polymerization of Hydroxyl Functionalized Cyclopentene

One-Pot Synthesis of Poly(vinyl alcohol) (PVA) Copolymers via Ruthenium Catalyzed Equilibrium Ring-Opening Metathesis Polymerization of Hydroxyl Functionalized Cyclopentene

Oxygen permeation resistance of polyethylene, polyethylene/ethylene vinyl alcohol copolymer, polyethylene/modified ethylene vinyl alcohol copolymer, and polyethylene/modified polyamide–ethylene vinyl alcohol copolymer bottles

Synthesis of water vapor barrier membrane by coating of poly(vinyl alcohol) substrate with poly(tert‐butyl acrylate)‐silica nanocomposite

Contact Info

Product

Resources

About