Effect of chemical modification of corn starch for the development of films for packaging applications: Impact of glutaraldehyde and organically modified montmorillonite incorporation

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers Pub Date : 2025-07-09 DOI:10.1016/j.carbpol.2025.124019

Sriram Srinivasan , Changfeng Ge , Christopher L. Lewis , S. Shamshath Begum , Asit Baran Samui , Hans Frederick Noyes

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Abstract

In this current study, hydroxyethyl methacrylate (HEMA) was grafted onto corn starch (CS), proceeding with a chemical modification method to obtain modified CS (CS_M) with improved properties. When CS and CS_M were subjected to Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) characterisation, distinct peaks were observed in CS_M. During FTIR characterisation, peaks at 1714 cm⁻¹ and 1629 cm⁻¹ were observed, corresponding to CO stretching of HEMA and secondary amines, respectively. These starch samples were then cast into films using glycerol as a plasticizer. Further, various concentrations of glutaraldehyde (GTA) (2 wt%, 5 wt%, and 8 wt%) and 0.1 wt% of organically modified montmorillonite (OMMT) were utilised to enhance the properties of the CS_M film samples. Among these, the film with 5 wt% GTA and 0.1 wt% OMMT (CS_MF-5GO) was optimised. The hydrophobicity was found to improve with the maximum water contact angle (WCA), and minimum water solubility (WS), water absorption (WA), moisture absorption (MA) at 22.7 % RH, and 75 % RH in comparison to other samples. The respective values were found to be, 95.07 ^o, 2.31 %, 189.1 %, 3.49 %, and 1.41 %. The tensile Strenght (TS) was also found to be maximum with a value of 30.22 MPa. The water vapour transmission rate (WVTR) was found to be 3.03 g/m².day.kPa and 86.23 g/m².day.kPa for the dry and wet cup methods, respectively. Further, soil biodegradation characterisation displayed a positive response with >90 % degradation within 10 days, confirming its sustainability.

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玉米淀粉化学改性对包装薄膜发展的影响：戊二醛和有机改性蒙脱土掺入的影响

本研究将甲基丙烯酸羟乙酯（HEMA）接枝到玉米淀粉（CS）上，采用化学改性的方法得到了性能更好的改性玉米淀粉（CSM）。对CS和CSM进行傅里叶变换红外光谱（FTIR）和核磁共振（NMR）表征，CSM具有明显的峰。在FTIR表征中，观察到1714 cm - 1和1629 cm - 1处的峰，分别对应于HEMA和仲胺的CO拉伸。然后用甘油作为增塑剂将这些淀粉样品浇铸成薄膜。此外，使用不同浓度的戊二醛（GTA）（2 wt%， 5 wt%和8 wt%）和0.1 wt%的有机改性蒙脱土（OMMT）来增强CSM膜样品的性能。其中，以GTA含量为5 wt%， OMMT含量为0.1 wt% （CSMF-5GO）的膜为优化材料。与其他样品相比，在22.7% RH和75% RH条件下，最大水接触角（WCA）、最小水溶性（WS）、吸水率（WA）、吸湿率（MA）均有所提高。分别为95.07%、2.31%、189.1%、3.49%、1.41%。拉伸强度（TS）也最大，为30.22 MPa。水蒸气透过率（WVTR）为3.03 g/m2.day。86.23 g/m2.day。分别为干杯法和湿杯法的kPa。此外，土壤生物降解特征显示出积极的响应，10天内降解率达到90%，证实了其可持续性。

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来源期刊

Carbohydrate Polymers 化学-高分子科学

CiteScore

22.40

自引率

8.00%

发文量

1286

审稿时长

47 days

期刊介绍： Carbohydrate Polymers stands as a prominent journal in the glycoscience field, dedicated to exploring and harnessing the potential of polysaccharides with applications spanning bioenergy, bioplastics, biomaterials, biorefining, chemistry, drug delivery, food, health, nanotechnology, packaging, paper, pharmaceuticals, medicine, oil recovery, textiles, tissue engineering, wood, and various aspects of glycoscience. The journal emphasizes the central role of well-characterized carbohydrate polymers, highlighting their significance as the primary focus rather than a peripheral topic. Each paper must prominently feature at least one named carbohydrate polymer, evident in both citation and title, with a commitment to innovative research that advances scientific knowledge.