Preparation and properties of hydrophobic composite film based on OSA⁃modified high amylose corn starch

doi:10.19491/j.issn.1001-9278.2024.10.005

Abstract

Abstract:

In this study， high amylose corn starch （HACS） was esterified with octenyl succinic anhydride （OSA） to obtain three types of OSA starchs with different degree of modification （OS⁃3， OS⁃6， and OS⁃9）. Three types of OSA⁃modified high amylose corn starch composite films （OS⁃3/GEL， OS⁃6/GEL， and OS⁃9/GEL） were prepared using the as⁃prepared OSA starchs as raw materials and gelatin as a compound material. The light permeability， water solubility， moisture absorption， and surface hydrophobicity of the composite films were investigated. The results indicated that the properties of OSA⁃modified starch composite films were greatly improved compared to the unmodified starch composite film. OS⁃6/GEL exhibited the best performance with high light transmittivity of 87.72 %. However， its water solubility， moisture absorption， and water vapor transmittance decreased by 24.5 %， 29.6 %， and 30.35 %， respectively. In addition， its maximum static contact angle and dynamic contact angle reached 124.6 °and more than 100 °， respectively， after contact with water for 3 min. X⁃ray diffraction results indicated that the crystallinity of the original starch was reduced by the OSA modification， and the compatibility between the film⁃forming components was improved. Infrared spectroscopy analysis demonstrated that the introduction of OSA group weakened the interaction between the starch and the hydroxyl groups in gelatin molecules， causing the stronger hydrogen bonding between the two groups. Based on the properties and structure of the composite films， it could be concluded that the OSA modification enhanced the hydrophobic properties of the high amylose corn starch composite films. Through introducing an appropriate number of OSA groups， the resultant OS⁃6/GEL presented the best properties and excellent hydrophobic performance.

Key words: high amylose corn starch, octenyl succinic anhydride, starch composite film, hydrophobicity

CLC Number:

TQ317.3

WU Jianguo, HONG Yan, GU Zhengbiao, CHENG Li, LI Zhaofeng, LI Caiming, BAN Xiaofeng. Preparation and properties of hydrophobic composite film based on OSA⁃modified high amylose corn starch[J]. China Plastics, 2024, 38(10): 23-28.

Figures/Tables 9

Fig.1. Esterification of OSA reagent with starch

Fig.2. FTIR of HACS and OSA modified high amylose corn starch with different DS

样品名称	波长/nm
样品名称	400	500	600	700	800
HACS/GEL	20.15±0.22	22.44±0.98	25.54±1.11	26.32±0.88	27.47±1.43
OS⁃3/GEL	73.51±1.95	78.51±1.75	80.73±1.55	81.99±1.37	82.91±1.23
OS⁃6/GEL	82.55±1.05	86.51±1.11	87.72±1.21	88.41±1.14	88.82±1.06
OS⁃9/GEL	77.13±0.54	81.59±0.51	83.32±0.53	84.22±0.59	84.86±0.65

Tab.1. The light transmission of HACS composite film and OSA modified high amylose corn starch composite films

样品名称	水溶性/%	吸湿性/%
HACS/GEL	41.24±0.23	6.48±0.14
OS⁃3/GEL	33.48±0.24	4.77±0.37
OS⁃6/GEL	31.16±0.43	4.56±0.01
OS⁃9/GEL	38.49±0.61	4.90±0.05

Tab.2. The water solubility and hygroscopicity of HACS composite film and OSA modified high amylose corn starch composite films

Fig.3. The water vapor transmittance of high amylose corn starch composite film and OSA modified high amylose corn starch composite films

Fig.4. The static contact angles of HACS composite film and OSA modified high amylose corn starch composite films

Fig.5. The dynamic contact angle curves of different OSA modified high amylose corn starch composite films

Fig.6. The XRD patterns of different OSA modified high amylose corn starch composite films

Fig.7. FTIR spectra of different OSA modified high amylose corn starch composite films

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