Study of shear-induced interfacial crystallization in polymer-based composite through in situ monitoring interfacial shear stress
Study of shear-induced interfacial crystallization in polymer-based composite through in situ monitoring interfacial shear stress
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DOI：
10.1007/s10853-013-7330-9
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发表时间：
2013-04
影响因子：
4.5
通讯作者：
Bingbing Sun;Yijing Qin;Yahu Xu;Yuanhui Sun;Bo Wang;K. Dai;G. Zheng;Chuntai Liu;Jingbo Chen-Jingbo
中科院分区：
文献类型：
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作者：
Bingbing Sun;Yijing Qin;Yahu Xu;Yuanhui Sun;Bo Wang;K. Dai;G. Zheng;Chuntai Liu;Jingbo Chen-Jingbo
为了进一步研究聚合物基复合材料的剪切诱导界面结晶，设计并制作了一套改进的纤维拉伸装置。其独特之处在于，通过安装力传感器，可以实时监测聚合物基体与拉伸纤维之间的界面剪切应力的变化。因此，可以定量地建立界面剪切应力和随后的结晶形态之间的关系。在通过该装置的初步研究中，采用等规聚丙烯（iPP）/玻璃纤维复合材料作为模型系统。结果表明，界面剪切应力的存在促进了界面结晶动力学。此外，界面结晶形态存在两个界面剪切应力阈值。其中，0.017 MPa为诱导iPP成核的压力，高于此压力，α型iPP晶体在随后的等温结晶过程中得到明显的促进; 0.042 MPa为诱导β型iPP晶体生成的压力，高于此压力，β型iPP晶体在穿晶区得到触发。
In order to further investigate shear-induced interfacial crystallization of polymer-based composites, an improved fiber-pulling device was designed and built. Its peculiar characteristic is that a force transducer is assembled to in situ monitor the variation of interfacial shear stress between the polymer matrix and pulling fiber. Thus, the relationship between interfacial shear stress and the subsequent crystalline morphology can be quantitatively established. In the preliminary study via this device, isotactic polypropylene (iPP)/glass fiber composite was adopted as a model system. The results indicate that interfacial crystallization kinetics is promoted by the presence of interfacial shear stress. Furthermore, there are two thresholds of interfacial shear stress for interfacial crystalline morphology. To be specific, one (0.017 MPa) is for the induction of iPP nucleation, above which α-form iPP crystals are obviously encouraged during the subsequent isothermal crystallization; the other is for the generation of β-form iPP crystals (0.042 MPa), above which β-form crystals are favored to be triggered in the transcrystalline region.