On-line WAXD / SAXS Measurements of Fiber Structure Development in the CO_2 Laser-Hated-Drawing of Poly(ethylene terephthalate) Fiber

聚对苯二甲酸乙二醇酯纤维 CO_2 激光讨厌拉伸过程中纤维结构发展的在线 WAXD/SAXS 测量

• 批准号: 15350135
• 负责人: URAKAWA Hiroshi
• 金额: $ 9.79万
• 依托单位: Kyoto Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15350135/
• 关键词: fiber structure; laser heated drawing; wide angle diffraction; small angle X-ray scattering; structure formation process; on-line measurement; poly(ethylene terephthalate); orientation-induced crystallization; 繊維構造形成過程; シシカバブモデル; 結晶化; 広角X線回析

The structures and properties of synthetic fibers are mainly determined during the secondary drawing process of fibers, so-called neck-like deformation. To observe the fiber structure development in-situ X-ray measurement system with the laser drawing process were designed and constructed. The neck drawing point on running fiber was successfully fixed by local irradiation of CO_2 laser using this new system. The positional fluctuation of neck-drawing point was less than 0.5mm, which was corresponding to the time resolution of several hundred micro seconds. In-situ measurements of fiber structure formation of poly(ethylene terephthalate) (PET) were performed at SPring8, where the strongest X-ray beam was available for scattering experiments in Japan. Wide angle X-ray Diffraction (WAXD) and Small angle X-ray Scattering (SAXS) were measured as a function of elapsed time after necking. Their dependence on the drawing ration also examined. Four-point SAXS patterns considering relative to lo … More ng period appeared from the necking point. Meanwhile crystal reflections in the WAXD pattern appeared after the four-point pattern. The density fluctuation in large scale came out earlier than crystallization. The meridional reflection (001') of around 5.4^<o__-> and the equatorial ones from PET crystal shows the different behavior in time evolution. The (001') diffraction peak appeared just after necking point. However the crystal diffractions came out at several milliseconds after necking. The peak of (001') grew up with the elapsed time at the initial stage and disappeared when the crystal diffraction peaks became clear. The (001') reflection originated with the conformation of the extended single chain of PET. Accordingly at the initial stage of fiber structure formation PET molecules were extended and constructed the two-dimensionally ordered structure. At the next step this structure transformed to crystal one. The further data analysis leaded to the new model of fiber structure development. Less

合成纤维的结构和性能主要是在纤维的二次拉伸过程中决定的，即所谓的颈状变形。为了观察纤维结构的发展过程，设计并搭建了激光拉伸原位X射线测量系统。利用该系统成功地用CO_2激光局部照射固定了运行光纤上的拉颈点。拉颈点的位置波动小于0.5 mm，相当于几百微秒的时间分辨率。对聚对苯二甲酸乙二酯(PET)的纤维结构形成进行了原位测量，在日本的SPRING 8上进行了最强的X射线散射实验。测量了颈缩后的广角X射线衍射(WAXD)和小角X射线散射(SAXS)随时间的变化。他们对提款定额的依赖程度也得到了检验。相对于Lo…考虑的四点SAXS模式从颈缩点开始出现较多的NG周期。同时，WAXD花样中的晶体反射出现在四点花样之后。大尺度密度起伏早于结晶出现。5.4lt；o-&gt附近的经向反射(001‘)与来自PET晶体的赤道反射在时间演化上表现出不同的行为。(001‘)衍射峰正好出现在颈缩点之后。然而，在颈缩后几毫秒，晶体衍射物就出来了。(001‘)峰在生长初期随时间增长，当晶体衍射峰清晰时消失。(001‘)反射起源于延伸的PET单链构象。相应地，在纤维结构形成的初始阶段，对PET分子进行了扩展，构建了二维有序结构。在下一步，这个结构转变为晶体结构。通过进一步的数据分析，得出了纤维结构发展的新模型。较少

项目成果

ファイバー工学(白井汪芳・山浦和男編)

纤维工程（白井敬义、山浦和夫编）

• 发表时间: 2005
• 作者: 浦川 宏;梶原莞爾;大越豊
• 通讯作者: 大越豊

Online wide‐angle X‐ray diffraction/small‐angle X‐ray scattering measurements for the CO2‐laser‐heated drawing of poly(ethylene terephthalate) fiber

• DOI: 10.1002/polb.20398
• 发表时间: 2005-05
• 期刊: Journal of Polymer Science Part B
• 作者: T. Yamaguchi;Kohei Komoriyama;Y. Ohkoshi;H. Urakawa;Y. Gotoh;Norihisa Terasawa;M. Nagura;K. Kajiwara

ファイバー工学(白井汪芳, 山浦和男編)

纤维工程（白井敬义、山浦和夫编）

• 发表时间: 2005
• 作者: Takayoshi Yamaguchi;Kohei Komoriyama;Yutaka Ohkoshi;Hiroshi Urakawa;Yasuo Gotoh;Norihisa Terasawa;Masanobu Nagura;Kanji Kajiwara;浦川 宏ら
• 通讯作者: 浦川 宏ら