Effect of Sorbitol Plasticizer on the Structure and Properties of Melt Processed Polyvinyl Alcohol Films

Tian, Huafeng; Liu, Di; Yao, Yuanyuan; Ma, Songbai; Zhang, Xing

doi:10.1111/1750-3841.13950

Cited by 81 publications

(57 citation statements)

References 31 publications

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“…It appears that at low concentrations, RCNPs have plasticizer-like behavior. In contrast to the small molecular plasticizer, which typically increases the elongation of polymers, but decreases the modulus and strength, 61,62 the use of RCNPs does not decrease the strength of the PVA (Fig. 5c).…”

Section: Resultsmentioning

confidence: 96%

Fabrication of regenerated cellulose nanoparticles by mechanical disintegration of cellulose after dissolution and regeneration from a deep eutectic solvent

Sirviö

2019

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 96%

Fabrication of regenerated cellulose nanoparticles by mechanical disintegration of cellulose after dissolution and regeneration from a deep eutectic solvent

Sirviö

2019

J. Mater. Chem. A

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“…Although PALS measures the free volume void size in the amorphous regions in the polymer, insight into these different plasticizing behaviors can be gained from the polymer crystal structure. The characteristic peak at approximately 20° confirms the semi-crystalline nature of the polymer [35]. The apparent crystallite size in the PVA samples, was estimated from the inverse peak width using Scherrer equation, tcrys=kλβcosθ where k is a shape factor for the crystallite, here assumed to be unity, λ is the X-ray wavelength, β is the FWHM peak width determined after linear background subtraction, and θ is the scattering angle of the peak.…”

Section: Resultsmentioning

confidence: 99%

The Impact of Plasticizer and Degree of Hydrolysis on Free Volume of Poly(vinyl alcohol) Films

et al. 2018

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The effect of plasticizer species and the degree of hydrolysis (DH) on the free volume properties of poly(vinyl alcohol) (PVA) were studied using positron annihilation lifetime spectroscopy. Both glycerol and propylene glycol caused an increase in the free volume cavity radius, although exhibited distinct plasticization behavior, with glycerol capable of occupying existing free volume cavities in the PVA to some extent. The influence of water, normally present in PVA film under atmospheric conditions, was also isolated. Water added significantly to the measured free volume cavity radius in both plasticized and pure PVA matrices. Differences in plasticization behavior can be attributed to the functionality of each plasticizing additive and its hydrogen bonding capability. The increase in cavity radii upon plasticizer loading shows a qualitative link between the free volume of voids and the corresponding reduction in Tg and crystallinity. Cavity radius decreases with increasing DH, due to PVA network tightening in the absence of acetate groups. This corresponds well with the higher Tg observed in the resin with the higher DH. DH was also shown to impact the plasticization of PVA with glycerol, indicating that the larger cavities—created by the weaker hydrogen bonding acetate groups—are capable of accommodating glycerol molecules with negligible effect on the cavity dimensions.

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“…As a kind of biodegradable and eco‐friendly materials, water‐soluble poly (vinyl alcohol) (PVA) has been widely used in various industrial applications, such as biodegradable materials, chemical engineering, and so on . The most important parameters influencing the physical properties of PVA are the molecular weight and alcoholysis degree . Due to the alcoholysis degree, PVA could be divided into 3 kinds with high (98%‐100%), medium (87%‐89%), and low alcoholysis degree (78%) .…”

Section: Introductionmentioning

confidence: 99%

Improved mechanical properties of poly (vinyl alcohol) films with glycerol plasticizer by uniaxial drawing

Tian

Zhou

et al. 2018

Polymers for Advanced Techs

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In this work, the uniaxial stretching poly (vinyl alcohol) (PVA) films with glycerol as plasticizer were prepared to explore the influence of drawing temperature and drawing ratio. The structure and property were investigated with scanning electron microscope, wide-angle X-ray diffraction, X-ray diffraction, differential scanning calorimetry, mechanical tests, etc. With the increase of stretching temperature, the melting and crystallization temperatures increased. The tensile strength and Young modulus of glycerol/PVA films increased first and then decreased; when the temperature was 80°C, the tensile strength and Young modulus reached to maximum values of 197.2 and 470 MPa, respectively. In addition, with the increase of draw ratio, the orientation degree of the PVA molecular chains increased, indicating the improved regularity of molecular chains. When the PVA films were stretched to 4 times, the tensile strength and Young modulus of the films reached 162 and 143 MPa, respectively, which were 4 and 1.3 times compared with those of unoriented films. These environmentally friendly PVA films with excellent mechanical properties would find wide applications in the industry such as packaging, coating, etc. KEYWORDS glycerol, orientation, poly (vinyl alcohol), uniaxial stretching 1 | INTRODUCTION As a kind of biodegradable and eco-friendly materials, water-soluble poly (vinyl alcohol) (PVA) has been widely used in various industrial applications, such as biodegradable materials, chemical engineering, and so on. 1-4 The most important parameters influencing the physical properties of PVA are the molecular weight and alcoholysis degree. 5-7Due to the alcoholysis degree, PVA could be divided into 3 kinds with high (98%-100%), medium (87%-89%), and low alcoholysis degree (78%). 8 Poly (vinyl alcohol) with medium alcoholysis degree could dissolve in both hot and cold water, while PVA with alcoholysis degree more than 99% could only dissolve in hot water with temperature higher than 95°C. Compared with PVA with low alcoholysis degree, high alcoholysis PVA possesses higher water resistance, mechanical properties, as well as oxygen barrier properties, therefore exhibiting wider applications. 3,9 Stretching is mainly divided into uniaxial stretching and biaxial stretching, and it is well known that after stretching of films above its glass transition temperature (T g ), the molecular chain or molecular chain segments will rearrange toward the direction of external force. 10-12 For semicrystalline polymers, 13 stretching is an effective method to obtain oriented films with excellent mechanical, optical, and thermal properties, 14,15 which has been carried out at large-scale production for nearly 80 years. 16 These end-use properties are essentially controlled by stretching-induced crystallization of the polymer, which is affected by the stretching mode and processing conditions, such as temperature, stretching rate, and draw ratio (DR). 17,18 The processing conditions have strong impact on the morphology, crystalline structure...

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Effect of Sorbitol Plasticizer on the Structure and Properties of Melt Processed Polyvinyl Alcohol Films

Cited by 81 publications

References 31 publications

Fabrication of regenerated cellulose nanoparticles by mechanical disintegration of cellulose after dissolution and regeneration from a deep eutectic solvent

Fabrication of regenerated cellulose nanoparticles by mechanical disintegration of cellulose after dissolution and regeneration from a deep eutectic solvent

The Impact of Plasticizer and Degree of Hydrolysis on Free Volume of Poly(vinyl alcohol) Films

Improved mechanical properties of poly (vinyl alcohol) films with glycerol plasticizer by uniaxial drawing

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