Manufacture, Characterization, and Structure Analysis of Melt-Spun Fibers Derived from Paramylon Esters
Manufacture, Characterization, and Structure Analysis of Melt-Spun Fibers Derived from Paramylon Esters
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DOI：
10.2115/fiberst.2020-0018
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发表时间：
2020-05-01
影响因子：
0.6
通讯作者：
Iwata, Tadahisa
中科院分区：
文献类型：
--
作者：
Gan, Hongyi;Kabe, Taizo;Iwata, Tadahisa
裸藻淀粉（Paramylon）——一种由眼虫属光生产的 β-1,3-葡聚糖。是一种很有前途的生物基塑料原材料。合成了丙酸裸藻淀粉(PaPr)、丁酸裸藻淀粉(PaBu)和戊酸裸藻淀粉(PaVa)三种裸藻淀粉酯衍生物来制造熔纺纤维。熔体加工温度通过差示扫描量热法（DSC）和熔体流动测试相结合来确定。分别使用偏光光学显微镜 (POM)、广角 X 射线衍射 (WAXD) 和拉伸测试研究了熔纺纤维的分子取向、结晶度和拉伸性能。 POM 显示，尽管卷取率存在变化，但 PaPr 分子链沿纺丝方向排列。然而，WAXD 证实结晶仅发生在以超过 108 m/min 的较高卷绕速率纺丝的 PaPr 纤维中，这表明结晶是由高剪切力诱导的。这种现象似乎是由于由吡喃糖环组成的刚性主链结构造成的。随着PaPr纤维的进一步退火，拉伸强度随着结晶度的增加而增加。在 PaBu 和 PaVa 熔纺纤维中也观察到了这些趋势。裸藻淀粉酯衍生物的熔纺纤维由粉末制成，不含任何添加剂。
Paramylon-a beta-1,3-glucan photoproduced by Euglena.is a promising raw material for bio-based plastics. Three kinds of paramylon ester derivatives.paramylon propionate (PaPr), paramylon butyrate (PaBu), and paramylon valerate (PaVa).were synthesized to manufacture melt-spun fibers. The melt processing temperatures were determined by combining differential scanning calorimetry (DSC) and a melt flow test. The molecular orientation, crystallinity, and tensile properties of the melt-spun fibers were investigated using a polarized optical microscope (POM), wide-angle X-ray diffraction (WAXD), and tensile testing, respectively. The POM revealed that the PaPr molecular chains were aligned along the spinning direction, despite variation in the take-up rate. However, WAXD confirmed that crystallization only occurred in PaPr fibers spun at a higher take-up rate of over 108 m/min, suggesting that crystallization is induced by high shearing force. This phenomenon seems to be due to the rigid mainchain structure consisting of pyranose rings. With further annealing of the PaPr fibers, the tensile strength increased with an increase in crystallinity. These tendencies were also observed in the PaBu and PaVa melt-spun fibers. The melt-spun fibers of paramylon ester derivatives were manufactured from powders without any additives.