Characteristic changes in PHBH isothermal crystallization monofilaments by the effect of heat treatment and dip-coating in various solvents
Characteristic changes in PHBH isothermal crystallization monofilaments by the effect of heat treatment and dip-coating in various solvents
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DOI：
10.1016/j.eurpolymj.2020.109808
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发表时间：
2020-07-05
影响因子：
6
通讯作者：
Tanaka, Toshihisa
中科院分区：
文献类型：
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作者：
Rebia, Rina Afiani;Shizukuishi, Kaho;Tanaka, Toshihisa
采用熔融纺丝工艺制备了PHBH单丝，并在T-g附近等温结晶24、48和72 h后进行一步拉伸。一种可行的方法来提高单丝的功能性是掺入天然化合物作为抗菌剂，如双酚A。此外，使用各种溶剂来评估PEG 4到PHBHIC单丝中的渗透。研究了丙酮、乙醇、正己烷、丙醇、水和空气等溶剂热处理对PHBH IC纤维物理变化的影响。发现纤维的收缩率和直径的变化高度依赖于每种溶剂的温度。还评价了浸涂法作为在乙醇和丙酮溶液中掺入荧光试剂的方法。丙酮-丙酮（AP）溶液对PHBHIC单丝具有良好的渗透性。在50 ℃的AP溶液中浸涂5、10、15圈，对PHBH IC单丝的物理性能、力学性能和内部结构均有影响。IC 24和72 h纤维在浸涂15圈后的长度分别比初始长度收缩25%和26%。因此，作为沉淀剂在IC单丝的空隙中沉降的结果，IC纤维的直径膨胀并且IC纤维的重量增加。浸涂后IC 24和72 h单丝显示拉伸强度降低和断裂伸长率增加。IC 24和72 h单丝的结晶度（WAXD）降低，并导致片晶厚度（SAXS）增加，通过施加浸涂15个循环。抗菌试验表明，含β-羟基丁酸酯的PHBH IC纤维对金黄色葡萄球菌的生长有抑制作用。此外，PHBH IC纤维的特性变化可作为进一步研究药物输送或不同溶剂染色过程的参考。
PHBH monofilament was fabricated by the melt-spinning process followed one-step-drawing after isothermal crystallization (IC) near T-g for 24, 48, and 72 h. A feasible way to improve the functionality of monofilament is the incorporation of natural compounds as an antibacterial reagents such as propolis. Moreover, various solvents were used to evaluate the penetration of propolis into PHBH IC monofilaments. The effect of heat treatment by various solvents such as acetone, ethanol, hexane, propanol as well as water, and air in physical change of PHBH IC fibers have been studied. The change in shrinkage and diameter of fibers found to be highly dependent on the temperature of each solvents. The dip-coating as a method to incorporate propolis reagent in ethanol and acetone solution was also evaluated. Acetone-propolis (AP) solution showed excellent penetration into PHBH IC monofilaments. Furthermore, by dip-coating for 5, 10, 15 circle times in AP solution at 50 degrees C affected the physical properties, mechanical properties, and inner structure of PHBH IC monofilaments. The length of IC 24 and 72 h fibers after dip-coating for 15 circle times shrank 25 and 26% from the initial length, respectively. Thus, the diameter of IC fibers expanded and the weight of IC fibers increased as a consequence of the propolis reagent settle in voids of IC monofilaments. IC 24 and 72 h monofilaments after dip-coating showed a reduction in tensile strength and an increase in elongation at break. The crystallinity (WAXD) of IC 24 and 72 h monofilaments was decreased and led to an increase in the thickness of the lamellar crystal (SAXS) by applying dip-coating for 15 circle times. The antibacterial test demonstrated that PHBH IC fibers containing propolis resulted in inhibitors against the growth of Staphylococcus aureus. Additionally, the characteristic changes in PHBH IC fibers can apply for reference as further research regarding drug delivery or the dyeing process by various solvents.