Fabrication and Enhanced Flexibility of Starch-Based Cross-Linked Films.

IF 5.5 2区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Biomacromolecules Pub Date : 2024-11-06 DOI:10.1021/acs.biomac.4c01172
Ji-Hyun Cho, Kwang-Hyun Ryu, Hyun-Joong Kim, Jong-Ho Back
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Abstract

The development of sustainable materials has driven significant interest in starch as a renewable and biodegradable polymer. However, the inherent brittleness, hydrophilicity, and lack of thermoplasticity of native starch limit its application in material science. This study addresses the limitations of native starch by converting it to dialdehyde starch (DAS) and cross-linking with polyether diamines via imine bonds. The effects of Jeffamine molecular weights (D-2000, D-400, and D-230) and mole ratios on the mechanical, thermal, and structural properties of starch-based films were examined. The cross-linked DAS/Js films exhibited significant enhancements in flexibility and toughness. Specifically, DAS/J2000 at a 0.03 mol ratio achieved a tensile strength of 62.9 MPa. In comparison, DAS/J400 at a 0.5 mol ratio demonstrated 126.2% elongation at break, indicating the balance between cross-linking density and chain mobility. X-ray diffraction (XRD) analysis revealed reduced crystallinity and tighter molecular packing with increased cross-linking. Dynamic mechanical analysis (DMA) indicated a decrease in Tg with an increasing mole ratio, reflecting enhanced molecular mobility. The results underscore the potential of optimized cross-linking conditions to produce starch-based films with properties that contribute to developing sustainable biopolymer materials.

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淀粉基交联薄膜的制作与柔韧性增强
随着可持续材料的发展,人们对淀粉这种可再生、可生物降解的聚合物产生了浓厚的兴趣。然而,原生淀粉固有的脆性、亲水性和缺乏热塑性限制了它在材料科学领域的应用。本研究通过将原生淀粉转化为二甲醛淀粉(DAS)并通过亚胺键与聚醚二胺交联,解决了原生淀粉的局限性。研究考察了 Jeffamine 的分子量(D-2000、D-400 和 D-230)和摩尔比对淀粉基薄膜的机械、热和结构特性的影响。交联的 DAS/Js 薄膜在柔韧性和韧性方面都有显著提高。具体来说,摩尔比为 0.03 的 DAS/J2000 拉伸强度达到 62.9 兆帕。相比之下,摩尔比为 0.5 的 DAS/J400 的断裂伸长率为 126.2%,这表明交联密度和链流动性之间达到了平衡。X 射线衍射(XRD)分析表明,随着交联度的增加,结晶度降低,分子堆积更紧密。动态机械分析(DMA)表明,随着摩尔比的增加,Tg 有所下降,这反映了分子流动性的增强。这些结果强调了优化交联条件生产淀粉基薄膜的潜力,其特性有助于开发可持续生物聚合物材料。
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来源期刊
Biomacromolecules
Biomacromolecules 化学-高分子科学
CiteScore
10.60
自引率
4.80%
发文量
417
审稿时长
1.6 months
期刊介绍: Biomacromolecules is a leading forum for the dissemination of cutting-edge research at the interface of polymer science and biology. Submissions to Biomacromolecules should contain strong elements of innovation in terms of macromolecular design, synthesis and characterization, or in the application of polymer materials to biology and medicine. Topics covered by Biomacromolecules include, but are not exclusively limited to: sustainable polymers, polymers based on natural and renewable resources, degradable polymers, polymer conjugates, polymeric drugs, polymers in biocatalysis, biomacromolecular assembly, biomimetic polymers, polymer-biomineral hybrids, biomimetic-polymer processing, polymer recycling, bioactive polymer surfaces, original polymer design for biomedical applications such as immunotherapy, drug delivery, gene delivery, antimicrobial applications, diagnostic imaging and biosensing, polymers in tissue engineering and regenerative medicine, polymeric scaffolds and hydrogels for cell culture and delivery.
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