The influence of plasticizer on the mechanical, structural, thermal and strain recovery properties following stress-relaxation process of silk fibroin/sodium alginate biocomposites for biomedical applications

IF 3.3 2区 医学 Q2 ENGINEERING, BIOMEDICAL Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2024-11-03 DOI:10.1016/j.jmbbm.2024.106797
Baki Aksakal , Zehra Kaplan , Kadir Turhan
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Abstract

The influence of plasticizer glycerol (GLY) on the mechanical, structural, and thermal properties of silk fibroin (SF)/sodium alginate (SA) biocomposite films was investigated in detail. As the SF/SA ratio increased up to 65%, the SF content significantly improved the Tensile strength (σT), Young's modulus (Ey) but reduced the elongation at break (εb). To modify and enhance the elasticity and flexibility of the biocomposite films, the GLY as a plasticizer was used at different ratio from 20 to 50% for each SF/SA biocomposite films. Although the extensibility of the films was improved greatly with increasing GLY ratio, σT and Ey reduced significantly. The effect was observed more apparently for the GLY ratio starting from 35%. It was also shown that crystallinity index in the Amide I region increased as the SF/SA ratio increased to 65%. Increasing SF content improved the thermal stability of the SF/SA biocomposites. The XRD results showed that crystallinity was increased as SF/SA ratio increased. Stress-relaxation of SF/SA (30%) biocomposite films plasticized with GLY revealed that each kind of plasticized films showed a viscoelastic behavior and a fast relaxation in the first stage (1–2 min) of the processes and then continued slowly. The GLY increased the extensibility and elasticity limit of the SF/SA (30%) composite films. During the strain recovery processes, the plasticized composite films recovered completely in a quite shorter time than that of unplasticized films. It was observed higher the GLY content, the recovery times became shorter.

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增塑剂对用于生物医学的丝纤维素/海藻酸钠生物复合材料应力松弛过程中的机械、结构、热和应变恢复特性的影响
详细研究了增塑剂甘油(GLY)对蚕丝纤维素(SF)/海藻酸钠(SA)生物复合膜的机械、结构和热性能的影响。当 SF/SA 比率增加到 65% 时,SF 含量显著提高了拉伸强度(σT)和杨氏模量(Ey),但降低了断裂伸长率(εb)。为了改变和提高生物复合膜的弹性和柔韧性,在每种 SF/SA 生物复合膜中以 20% 到 50% 的不同比例使用 GLY 作为增塑剂。虽然薄膜的延展性随着 GLY 比率的增加而大大提高,但 σT 和 Ey 却显著降低。GLY 比率从 35% 开始时,这种影响更为明显。研究还表明,随着 SF/SA 比率增加到 65%,酰胺 I 区域的结晶度指数也随之增加。SF 含量的增加提高了 SF/SA 生物复合材料的热稳定性。XRD 结果表明,结晶度随着 SF/SA 比率的增加而增加。用 GLY 对 SF/SA (30%) 生物复合材料塑化薄膜进行应力-松弛试验发现,每种塑化薄膜都表现出粘弹性行为,在塑化过程的第一阶段(1-2 分钟)松弛速度较快,随后持续缓慢。GLY 增加了 SF/SA (30%) 复合薄膜的延伸性和弹性极限。在应变恢复过程中,塑化复合薄膜比未塑化薄膜在更短的时间内完全恢复。据观察,GLY 含量越高,恢复时间越短。
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来源期刊
Journal of the Mechanical Behavior of Biomedical Materials
Journal of the Mechanical Behavior of Biomedical Materials 工程技术-材料科学:生物材料
CiteScore
7.20
自引率
7.70%
发文量
505
审稿时长
46 days
期刊介绍: The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.
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