Crystalline composition and morphology in isotactic polypropylene pipe under combining effects of rotation extrusion and fibril β‐nucleating Agent. (31st October 2018)
- Record Type:
- Journal Article
- Title:
- Crystalline composition and morphology in isotactic polypropylene pipe under combining effects of rotation extrusion and fibril β‐nucleating Agent. (31st October 2018)
- Main Title:
- Crystalline composition and morphology in isotactic polypropylene pipe under combining effects of rotation extrusion and fibril β‐nucleating Agent
- Authors:
- Pi, Lin
Nie, Min
Wang, Qi - Abstract:
- Abstract : Polypropylene (PP) pipe is extraordinarily important in modern construction and transportation engineering owing its predominant advantages over metal such as good dimensional stability, low cost, and light weight. However, low toughness and hoop strength always stand in the way of the wide application. In this study, two kinds of β‐nucleating agents (NAs) (WBG‐II and NAB‐83) were added in isotactic polypropylene and thereafter, the crystalline composition, morphology, and alignment were investigated under the combination effects of rotation extrusion and NA. The experimental results showed that both NAB‐83 and WBG‐II could promote numerous β crystals, but dot‐like NAB‐83 could only induce randomly distributed isotropic spherulites. On the contrary, by adjusting the temperature gradient along the extrusion to rotation section, WBG‐II first dissolved into PP melts and then self‐assembled into fiber‐like nuclei before the formation of PP crystals. Compared to homogeneous crystallization, fibrous WBG‐II nuclei lowered the energy barrier for PP crystals; therefore, epitaxial β lamellae grew on these fibrous NAs and stacked into β‐form hybrid shish kebabs. Meanwhile, the alignment of these highly oriented structures deflected from the axis driven by the helical movement caused by die rotation. Consequently, PP pipe with outstanding hoop tensile performance as well as excellent toughness was prepared. J. VINYL ADDIT. TECHNOL., 25:E195–E202, 2019. © 2018 Society ofAbstract : Polypropylene (PP) pipe is extraordinarily important in modern construction and transportation engineering owing its predominant advantages over metal such as good dimensional stability, low cost, and light weight. However, low toughness and hoop strength always stand in the way of the wide application. In this study, two kinds of β‐nucleating agents (NAs) (WBG‐II and NAB‐83) were added in isotactic polypropylene and thereafter, the crystalline composition, morphology, and alignment were investigated under the combination effects of rotation extrusion and NA. The experimental results showed that both NAB‐83 and WBG‐II could promote numerous β crystals, but dot‐like NAB‐83 could only induce randomly distributed isotropic spherulites. On the contrary, by adjusting the temperature gradient along the extrusion to rotation section, WBG‐II first dissolved into PP melts and then self‐assembled into fiber‐like nuclei before the formation of PP crystals. Compared to homogeneous crystallization, fibrous WBG‐II nuclei lowered the energy barrier for PP crystals; therefore, epitaxial β lamellae grew on these fibrous NAs and stacked into β‐form hybrid shish kebabs. Meanwhile, the alignment of these highly oriented structures deflected from the axis driven by the helical movement caused by die rotation. Consequently, PP pipe with outstanding hoop tensile performance as well as excellent toughness was prepared. J. VINYL ADDIT. TECHNOL., 25:E195–E202, 2019. © 2018 Society of Plastics Engineers … (more)
- Is Part Of:
- Journal of vinyl & additive technology. Volume 25(2019)Supplement 1
- Journal:
- Journal of vinyl & additive technology
- Issue:
- Volume 25(2019)Supplement 1
- Issue Display:
- Volume 25, Issue 1 (2019)
- Year:
- 2019
- Volume:
- 25
- Issue:
- 1
- Issue Sort Value:
- 2019-0025-0001-0000
- Page Start:
- E195
- Page End:
- E202
- Publication Date:
- 2018-10-31
- Subjects:
- Vinyl polymers -- Periodicals
Plastics -- Additives -- Periodicals
668.4236 - Journal URLs:
- http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1548-0585 ↗
http://onlinelibrary.wiley.com/ ↗ - DOI:
- 10.1002/vnl.21686 ↗
- Languages:
- English
- ISSNs:
- 1083-5601
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5072.483500
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 9659.xml