Robust Interfacial Cylindrites of Polylactic Acid Modulated by an Intense Shear Flow Field
Robust Interfacial Cylindrites of Polylactic Acid Modulated by an Intense Shear Flow Field
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强剪切流场调制的聚乳酸鲁棒界面柱晶
DOI：
10.1021/acssuschemeng.6b00668
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发表时间：
2016-05
影响因子：
8.4
通讯作者：
Li Zhong-Ming
中科院分区：
文献类型：
--
作者：
Li Yang;Yang Su;Li Yu-Ke;Xu Jia-Zhuang;Ni Hai-Wei;Su Zhi-Hong;Li Zhong-Ming
采用自制的玻璃纤维拉丝装置和偏光显微镜相结合的方法，在实际加工条件范围内，通过改变玻璃纤维（GF）的拉丝速度来调制强剪切场，研究了PLA结晶形态/结构的演变。PLA球晶在静态熔体中的分散表明GF没有成核能力。高密度的行核诱导的强剪切流（120 s-1）周围的拉伸玻璃纤维表面。同时，这些晶核阻碍了片晶的横向延伸，迫使片晶的生长方向垂直于GF轴，导致了无规圆柱体的形成。随着剪切速率的提高，拉伸玻璃纤维表面的晶核密度进一步增加，柱状体变得更加致密，分别形成扇形和刷状形貌。二维广角X射线衍射分析表明，随着晶化温度的升高，柱状晶的结晶度和取向度均有所提高。
Evolution of crystalline morphology/structure of PLA was investigated by combination of homemade fiber-pulling device and polarized optical microscopy, where the intense shear field within the range of the actual processing conditions was modulated by the pulling speed of glass fiber (GF). Sporadic dispersion of PLA spherulites in the quiescent melt indicated no nucleation ability of GF. High density of row-nuclei was induced by the strong shear flow (120 s–1) around the pulled GF surface. Also, these nuclei hindered the lateral extension of lamellae and forced growth direction perpendicular to the GF axis, leading to the formation of the semicircle cylindrite. As the shear rate rose to 280 and 420 s–1, nuclei density on the surface of pulled GF was further increased, and the cylindrites became more compact, generating the fan-shaped and brush-like morphology, respectively. As detected by two-dimension wide-angle X-ray diffraction, the cylindrites showed increased crystallinity and degree of orientation w...
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影响因子：
5.5
作者：
Pan, Pengju;Zhu, Bo;Inoue, Yoshio
通讯作者：
Inoue, Yoshio
影响因子：
3.1
作者：
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通讯作者：
Peitao Xiao;Hong-fei Li;Shaoyong Huang;H. Wen;Donghong Yu;Yingrui Shang;Jingqing Li;Zhonghua Wu-Zhonghu
影响因子：
5.5
作者：
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通讯作者：
Haoqing Yang;J. Lei;Liangbin Li;Q. Fu;Zhong‐Ming Li
影响因子：
4.6
作者：
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通讯作者：
Chang‐Mou Wu;Ming Chen;J. Karger‐Kocsis
影响因子：
5.5
作者：
Azzurri, Fiorenza;Alfonso, Giovanni C.
通讯作者：
Alfonso, Giovanni C.