A comparison of the thermal degradation behaviours of poly(vinyl acetate), poly(vinyl alcohol) and poly(vinyl chloride)

Anders, H. E.; Zimmermann, H.

doi:10.1016/0141-3910(87)90024-3

Cited by 47 publications

(8 citation statements)

References 12 publications

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“…As observed, PVA and its composite show two-step degradation, which is consisted with the previous reports. 27,28 The first step took place between 230 and 350uC, resulting from the evaporation of the residual small molecules and the elimination of side hydroxyl groups, and reflecting the heat resistance of PVA and its composite. The second step happened between 350 and 470uC, which was attributed to the breakdown of the polymer backbone.…”

Section: Thermal Behaviour Of Pva/talc Compositesmentioning

confidence: 99%

Thermal processability and properties of highly filled poly(vinyl alcohol)/talc composite

Wang

2013

Plastics, Rubber and Composites

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A highly filled PVA/talc composite was prepared through our invented thermal processing technology without using any coupling agent or compatibiliser. The results showed that compared with neat PVA, the melt temperature of the composite decreased and the degradation temperature increased, providing a big temperature window for thermal processing of PVA/talc composite. The composite melt exhibited shear thinning behaviour while its viscosity increased with increasing talc, still satisfied the requirement of thermal processing. The morphology analysis confirmed that talc was well dispersed in PVA, improving heat deflection temperature (HDT), tensile strength and modulus of PVA. When talc was 50 wt-%, the HDT, tensile strength and modulus of the composite were 115uC, 48 MPa, 1?23 GPa respectively, increased by 92, 16 and 150%, compared with PVA, and the elongation at break was 100% of the composite, confirming that the high filled PVA/talc composite was a novel PVA based material with excellent thermal and mechanical properties.

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Section: Thermal Behaviour Of Pva/talc Compositesmentioning

confidence: 99%

Thermal processability and properties of highly filled poly(vinyl alcohol)/talc composite

Wang

2013

Plastics, Rubber and Composites

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“…[7,8] Generally, the major pyrolysis products were reported to be water, acetaldehyde, some unsaturated aldehydes, ketones, and benzene during thermal degradation. [10] Furthermore, a molecular weight study by solution viscosity showed that the thermal degradation of PVA led to an initial increase in the molecular weight, followed by a decrease. [10] Furthermore, a molecular weight study by solution viscosity showed that the thermal degradation of PVA led to an initial increase in the molecular weight, followed by a decrease.…”

Section: Thermal Degradation Of Pva Within the Meltmentioning

confidence: 99%

Conditions for Melt Crystallization Without Thermal Degradation and Equilibrium Melting Temperature of Atactic Poly(Vinyl Alcohol)

Endo

Amiya

Hikosaka

2003

Journal of Macromolecular Science, Part B

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Optimum conditions for melt crystallization without thermal degradation for atactic poly(vinyl alcohol) (PVA) were found for the first time. Thermal degradation of PVA in the melt has been too serious to permit crystallization from the melt. However, it was found that thermal degradation can be suppressed by selecting an appropriate solvent for film preparation, such as water without dimethyl sulfoxide (DMSO), by careful degassing before melting and by melting under high vacuum. As a result, the sample could be held in the melt at 2508C for 30 min and in the supercooled melt at 2208C for 480 min without thermal degradation. Therefore we could carry out the melt crystallization at a high crystallization temperature (T c ) in the range of 208 to 2218C and study the structures and morphologies of meltcrystallized PVA samples for the first time. The irregularly stacked lamellae were observed irrespective of T c . The thick lamellae with high T m , 24 nm and 236.18C, respectively, were obtained from the melt crystallization at T c ¼ 2208C; which indicates that the chain sliding diffusion is accelerated a little with increase of T c . However, the distribution of lamellar thickness was sharp, even for the sample crystallized at high T c , which indicated that the chain sliding diffusion is relatively 793 suppressed by the intermolecular hydrogen bonds. Hence, the lamellar thickening was suppressed during the crystallization, as compared with polyethylene (PE) and isotactic polypropylene (iPP). The equilibrium melting temperature ðT o m Þ of PVA was determined to be 2498C, applying an improved Gibbs -Thomson plot that was recently proposed by Yamada et al. The Hoffman-Weeks plot accidentally gave a similar T o m ¼ 2488C: It was confirmed that the lamellar thickness is inversely proportional to the degree of supercooling in the case of PVA crystals, which is the reason why both plots gave similar T o m :

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“…The thermal degradation of PVA has been reported . Generally for degradation below 300 °C, the major product of thermal degradation has been observed to be water, produced by the elimination of hydroxyl side‐groups form conjugated polyenes and non‐conjugated polyenes .…”

Section: Introductionmentioning

confidence: 99%

“…[12] The thermal degradation of PVA has been reported. [13][14][15][16] Generally for degradation below 300°C, the major product of thermal degradation has been observed to be water, produced by the elimination of hydroxyl side-groups form conjugated polyenes and non-conjugated polyenes. [13,14] The PVA cannot be prepared by the direct polymerization of vinyl alcohol, and thus, it is derived from the hydrolysis of PVAc.…”

Section: Introductionmentioning

confidence: 99%

Thermal curing and water re-exposure of silane-PVA/PVAc complex film on glass fiber surface

Repovský

Michalka

Velič

2014

Surf. Interface Anal.

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Because glass fiber reinforced composites are in industrial demand, chemistry and topography of the glass fiber sizing are of interest. Silane–PVA/PVAc (polyvinyl alcohol/polyvinyl acetate) complex film on the glass fiber surface is studied during thermal curing and water re‐exposure by using atomic force microscopy. The complex film consists of silane with the honeycomb structure film and PVA/PVAc with the hexagonal close pack structure of ellipsoidal shaped microspheres (270 × 620 nm). The thermal curing at 100 °C is leading to the evaporation of water contained in the microspheres. Because of water evaporation, the average roughness value of 1‐min thermal curing decreases from initial 7.3 to only 2.7 nm. Such a collapse of microsphere is followed by an intermixing between silane film and PVA/PVAc microspheres leading to a change of silane honeycomb structure along with silane tips. The average value of the silane honeycomb structure wall width decreases from 144 nm to 54 nm, for curing times of 15 and 30 min, respectively. A re‐exposure to an aqueous environment after 100 °C curing leads to almost completely restored microspheres regarding shape and size. The average complex film thickness increases from 180 nm for thermal curing for 30 min to 225 nm for water re‐exposed film. Interestingly, the pits in the microsphere structure are observed presumably because of the tips from intermixing. The thermal curing at 200 °C enhances the intermixing, and after 15 min, an intramixing is suggested to occur between PVAc core and PVA shell of the microsphere. The water re‐exposure after 15 min of 200 °C curing leads to a re‐containing of water but without restored microsphere structure; Because of the intramixing, leaving the silane–PVA/PVAc film is not complex anymore. Copyright © 2014 John Wiley & Sons, Ltd.

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A comparison of the thermal degradation behaviours of poly(vinyl acetate), poly(vinyl alcohol) and poly(vinyl chloride)

Cited by 47 publications

References 12 publications

Thermal processability and properties of highly filled poly(vinyl alcohol)/talc composite

Thermal processability and properties of highly filled poly(vinyl alcohol)/talc composite

Conditions for Melt Crystallization Without Thermal Degradation and Equilibrium Melting Temperature of Atactic Poly(Vinyl Alcohol)

Thermal curing and water re-exposure of silane-PVA/PVAc complex film on glass fiber surface

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