Studies of the plasticizing effect of different hydrophilic inorganic salts on starch/poly (vinyl alcohol) films

Jiang, Xiancai; Li, Hongmei; Luo, Youyou; Zhao, Yongjun; Hou, Linxi

doi:10.1016/j.ijbiomac.2015.11.046

Cited by 65 publications

(33 citation statements)

References 43 publications

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“…The thickness of each film was measured with a micrometer at three randomly selected points before the film was attached to the container. All containers were placed in a desiccator in the presence of a saturated NaCl solution (relative humidity 75%) at 20°C . The vapor pressure gradient across the film at 20°C was 1.755 × 10 3 Pa.…”

Section: Methodsmentioning

confidence: 99%

“…Prior to the measurement of mechanical properties, the films were conditioned for 48 h in the presence of different solutions, namely, a saturated K 2 CO 3 solution, a saturated Mg(NO 3 ) 2 ·6H 2 O solution, and a saturated CuCl 2 solution (providing relative humidities of 44%, 54%, and 68%, respectively) at 20°C in a chamber. The mechanical properties of the films were determined according to the GB 1040‐79 method by the TH‐5000 Materials Testing Machine (Jiangsu, China).…”

Section: Methodsmentioning

confidence: 99%

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Preparation and properties of poly(vinyl alcohol) films using carbohydrates as plasticizers

Dai

Wang

Liu

2018

Vinyl Additive Technology

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Three nontoxic carbohydrates (ribose, xylose, fructose) were used as poly(vinyl alcohol) (PVA) plasticizers to prepare PVA films using a casting method. Fourier transform infrared spectra demonstrated that hydrogen bonds formed between the carbohydrate and PVA. The crystallinity of raw PVA and PVA film plasticized by carbohydrate was characterized by X-ray diffraction. Differential scanning calorimetry showed that carbohydrate decreased the melting point (T m ) of PVA. The decomposition temperature of PVA increased with addition of carbohydrate. The thermal stability of PVA film plasticized by carbohydrate (CAPF) was higher than that of PVA film plasticized by glycerol (GLPF). The thermal processing window of CAPF was broader than that of GLPF. The water vapor resistance of CAPF was better than that of GLPF. The mechanical properties of PVA films stored at different relative humidity were studied. Generally, the tensile strength of CAPF was larger than that of GLPF, while the elongation at break of CAPF was close to that of GLPF. Our experimental results indicate that carbohydrates are effective plasticizers for PVA. J. VINYL ADDIT. TECHNOL., 25:E181-E187, 2019. ABBREVIATIONS ATR-FTIRattenuated total reflection-Fourier transform infrared CAPF PVA film plasticized by carbohydrate DSC differential scanning calorimetry GLPF PVA film plasticized by glycerol PVA poly(vinyl alcohol) TG thermogravimetry WVP water vapor permeability XRD X-ray diffraction

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Preparation and properties of poly(vinyl alcohol) films using carbohydrates as plasticizers

Dai

Wang

Liu

2018

Vinyl Additive Technology

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“…. T m was an important index to evaluate the plasticizing efficiency of the plasticizers . Owing to the strong inter‐ and intramolecular hydrogen bonds in raw PVA, raw PVA shows a very high T m 228.95°C .…”

Section: Resultsmentioning

confidence: 99%

“…Prior to the measurement of mechanical properties, the films were conditioned for 48 h in the presence of different solutions, namely, a saturated K 2 CO 3 solution, a saturated Mg(NO 3 ) 2 ·6H 2 O solution, a saturated CuCl 2 solution (providing relative humidity of 44%, 54%, and 68%, respectively) at 20°C in a chamber. Mechanical property of films was determined according to GB 1040‐79 method in the TH‐5000 Materials Testing Machine (Jiangsu, China).The speed was 50 mm min −1 .…”

Section: Methodsmentioning

confidence: 99%

Preparation and properties of PVA films using hydroxyalkylformamides as the plasticizers

Dai

Wang

2017

Polymer Engineering & Sci

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N,N‐Bis(2‐hydroxyethyl)formamide, N‐(2‐hydroxyethyl)formamide (HF), N‐(2‐hydroxyethyl)‐N‐methylformamide, and N‐(2‐hydroxypropyl)formamide were used as poly(vinyl alcohol) (PVA) plasticizers to prepare PVA films by casting method. The four synthesized compounds were hydroxyalkylformamides (HAF). Fourier‐transform infrared spectra demonstrated that hydrogen bond interaction between the new plasticizers HAF and PVA occurred. The crystallinity of PVA and PVA film was characterized by X‐ray diffraction. Differential scanning calorimetry showed that HAF could decrease the melting point (Tm) of PVA. For PVA films with the same weight content plasticizer, the lower the molecular mass of plasticizer was, the lower the Tm of PVA was. The Tm of HF‐plasticized PVA was lower than that of traditional glycerol‐plasticized PVA. Generally, water‐vapor resistance of HAF‐plasticized PVA film was better than that of glycerol‐plasticized PVA film. The mechanical properties of PVA films stored at different relative humidity were studied. HAF were effective plasticizers for PVA. POLYM. ENG. SCI., 58:E145–E150, 2018. © 2017 Society of Plastics Engineers

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“…Cations such as Ca 2+ can react with starch molecules and interrupt the intermolecular and intramolecular hydrogen bonding. So, these cations are suitable for plasticizing of starch film (Jiang, Li, Luo, Zhao, & Hou, 2016). CaCl 2 is a metal salt that could act as a cross linker and improve the interaction between starch molecules (Hedayati, Majzoobi, Shahidi, Koocheki, & Farahnaky, 2016).…”

Section: Introductionmentioning

confidence: 99%

Octenylsuccination of sago starch and investigation of the effect of calcium chloride and ferulic acid on physicochemical and functional properties of the modified starch film

Naseri

Shekarchizadeh

Kadivar

2019

J Food Process Preserv

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Sago starch was esterified with octenyl succinic anhydride (OSA). Physicochemical and functional properties of obtained starch derivative were investigated. Then, film from OSA‐modified starch was prepared to investigate the effect of starch modification on the film characteristics. Calcium chloride and ferulic acid was also added to modified starch solution to improve film characteristics. Modification of starch was confirmed according to Fourier transformation infrared spectrum. OSA‐modified starch had improved functional properties of starch paste as its water adsorption, solubility in water, emulsifying activity, and clarity was increased. The result of scanning electron microscopy images and X‐ray diffraction spectra showed that modification of sago starch with OSA destroyed the granular structure of starch. Solubility in water, water adsorption, water vapor permeability (WVP), elongation at break, transparency, and air‐water contact angle of the starch film increased by starch modification. However, water adsorption and WVP of modified film containing calcium chloride and ferulic acid decreased. Practical applications Modification of starch is suggested to improve its physicochemical and functional properties. In this work, sago starch was modified with OSA. Results showed that chemical modification of sago starch with OSA improved functional properties of native starch. On the contrary, extensibility and transparency of the film prepared with OSA‐modified starch was more than the native starch film. The information will be useful for the improvement of the food product properties.

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Studies of the plasticizing effect of different hydrophilic inorganic salts on starch/poly (vinyl alcohol) films

Cited by 65 publications

References 43 publications

Preparation and properties of poly(vinyl alcohol) films using carbohydrates as plasticizers

Preparation and properties of poly(vinyl alcohol) films using carbohydrates as plasticizers

Preparation and properties of PVA films using hydroxyalkylformamides as the plasticizers

Octenylsuccination of sago starch and investigation of the effect of calcium chloride and ferulic acid on physicochemical and functional properties of the modified starch film

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