Abstract
Previous study focused on the shear-induced crystallization of β-nucleated iPP under fixed shear rate and temperature [1]. In this work, in-situ synchrotron X-ray was used to investigate the crystallization behavior of well-selected β-nucleated iPP under thermo-mechanical conditions in a wide range of shear rates from 2 to 50 s−1 and shear temperatures from 133 to 150 °C. At lower shear rates, we found that the overall crystallization rate of the β-nucleated iPP was reduced compared with that under quiescent condition. This is mainly ascribed to variation of nucleation-dependent process after application of shear pulse, causing strong reduction of β-nucleating efficiency. As the shear rate increases from 2 to 50 s−1, the dimensionality of crystal growth basically decreased while the long period of lamellar structure tended to slightly increase. During the shear-induced crystallization, a decreasing temperature was significantly associated with decreased overall dimensionality of crystal growth but increased crystallization rate. Finally, we observed an abnormal increase of long period with time for β-nucleated iPP sheared at 133 °C.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.