Hao X.Q.,Zhengzhou University |
Zheng G.Q.,Zhengzhou University |
Zheng G.Q.,The Key Laboratory of Polymer Processing Engineering |
Dai K.,Zhengzhou University |
And 5 more authors.
Express Polymer Letters | Year: 2011
Polyethylene terephthalate (PET) fibers containing different contents of β-nucleating agent (β-NA) were meltspun from a reconstructive melt flow index rheometer at 270°C, and then blended with polypropylene (iPP). The supermolecular and phase structure of the composite were investigated by polarized optical microscopy (POM), differential scanning calorimetry (DSC), and wide-angle X-ray diffraction (WAXD). For the pure PET fiber reinforced iPP, the interfacial region was mainly composed of -modification, though it has been demonstrated that PET fiber shows weak nucleating ability towards iPP matrix. More interestingly, when the amount of β-NA introduced into the PET fiber exceeds a critical value, the transcrystalline layer will be notably dominated by β-modification. This method to prepare β-transcrystallinity is remarkably different from those through stress or temperature control. The present results provide a facile and promising technique to prepare rich β-transcrystallinity under stress-free conditions. © BME-PT. Source
Zhang P.,Guangzhou Fiber Product Testing Institute |
Zhang P.,South China University of Technology |
Ye H.X.,South China University of Technology |
Zhu R.T.,South China University of Technology |
And 4 more authors.
Advanced Materials Research | Year: 2014
Bio-based biodegradable materials like poly(lactic acid), PLA has been using in many field in different forms due to its advantages in facing greenhouse gas emission. Long-term degradation behavior in nature soil is not a good way to evaluate the biodegradability of PLA, an accelerated biodegradation of PLA in soil bacterial suspensions was carried out under controlled laboratory conditions. The degradation behavior of PLA nonwovens with basic weight of 80g/m2 and 23g/m2 were studied using mechanical testing, SEM and FTIR analysis. Results showed that an anaerobic biodegradation was found during the degradation of PLA, no significant shifts or formation of new bands in FT-IR test. A number of cracks speared on fiber surface means biodegradation happened in amorphous part in fibers. Heavy basic weight nonwoven showed faster biodegradation than that of a light one. © (2014) Trans Tech Publications, Switzerland. Source
Xu C.,Guangxi University |
Xu C.,The Key Laboratory of Polymer Processing Engineering |
Wang Y.,The Key Laboratory of Polymer Processing Engineering |
Wang Y.,South China University of Technology |
And 4 more authors.
Materials and Design | Year: 2015
To successfully fabricate a thermoplastic vulcanizate (TPV) based on poly (vinylidene fluoride) (PVDF) and high loading level of methylvinyl silicone rubber (MVSR), stabilizing the phase structure during blending is a challenge due to the distinct interface properties of the two materials. Herein, we report a feasible method to fabricate a desired PVDF/MVSR TPV by using fluorosilicone rubber (FSR) as an interfacial compatibilizer. We found that the FSR was self-assembly migrated from MVSR phase toward PVDF phase and finally located at the interface between PVDF and MVSR, forming core-shell-like spherical particles with a rough surface, and surprisingly, the crosslinked rubber particles were connected by fiber-like elastomeric materials which bonded onto the surfaces of the particles. The excellent property of repeat processing of the PVDF/MVSR/FSR TPV with such novel phase morphology makes it a potential alternative of fluorosilicone rubber in future. © 2015 Elsevier Ltd. Source
Zheng G.,Zhengzhou University |
Zheng G.,The Key Laboratory of Polymer Processing Engineering |
Qi Y.,Zhengzhou University |
Liu C.,Zhengzhou University |
And 4 more authors.
Polymer - Plastics Technology and Engineering | Year: 2010
The β-crystal formed in PP/PET fiber composites was investigated. The results indicate that PET fibers (PF) can preferably lead to α-crystal formation on their surface. Besides, α-crystals occur earlier than those in the bulk. The β-crystal, might be induced by temperature gradient, only formed away from the PF in composites with lower content of PF. The higher the content of PF is, more possible the PF network is constructed. The transcrystallinity induced by PF will rapidly occupy the region between the adjacent PFs. Consequently, owing to the spatial confinement, β-form is suppressed in the composites with higher content of PF. © Taylor & Francis Group, LLC. Source
Huang Z.,South China University of Technology |
Zhao J.,South China University of Technology |
Zhao J.,The Key Laboratory of Polymer Processing Engineering |
Yuan Y.,South China University of Technology |
And 5 more authors.
Polymers for Advanced Technologies | Year: 2013
In this study, amino derivative of pure silica zeolite nanocrystal (A-PSZN) was dispersed into polyimide (PI) matrix to prepare PI/A-PSZN hybrid films, and their thermal and mechanical properties, as well as hydrophobicity, were characterized scientifically. The test results show that PI/A-PSZN hybrid films possess higher glass transition temperature, higher thermal stability and lower in-plane coefficient of thermal expansion than pristine PI. The mechanical property data suggest that the incorporation of A-PSZN results in an increase in Young's modulus and tensile strength of the hybrid films, but as its content exceeds the critical value (maybe 5wt%), its enhancement effect on the hybrid's strength and toughness gets weaker. Furthermore, liquid dripping imaging analysis results indicate that the film's hydrophobicity is clearly improved by the introduction of A-PSZN. As compared with PSZN, A-PSZN exhibits better effect on enhancing the overall performance of pristine PI films. A comparison with other studies suggests that PI/A-PSZN is a hybrid film with superior comprehensive properties. © 2013 John Wiley & Sons, Ltd. Source