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- Title
Study of shear-induced interfacial crystallization in polymer-based composite through in situ monitoring interfacial shear stress.
- Authors
Sun, Bingbing; Qin, Yijing; Xu, Yahu; Sun, Yuanhui; Wang, Bo; Dai, Kun; Zheng, Guoqiang; Liu, Chuntai; Chen, Jingbo
- Abstract
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.
- Subjects
POLYMERIC composite testing; SHEARING force; CRYSTALLIZATION; INTERFACIAL stresses; TRANSDUCERS; POLYPROPYLENE fibers; GLASS fibers
- Publication
Journal of Materials Science, 2013, Vol 48, Issue 15, p5354
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-013-7330-9