Isotactic polypropylene reinforced atactic polypropylene by formation of shish-kebab superstructure

Zhang, Zheng-Chi; Deng, Liang; Lei, Jun; Li, Zhong‐Ming

doi:10.1016/j.polymer.2015.09.070

Cited by 20 publications

(19 citation statements)

References 56 publications

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“…Likewise, it was also reported that the mechanical properties of iPP fibre degraded with the addition of aPP component. The increased impact strength of iPP/aPP blend was found to be achieved with 5 to 20 wt % of aPP content addition, however, with a decrease in yield strength from about 40 MPa to 20 MPa [38]. Similarly, a change in thermal properites of iPP blends was found to alter with the addition of aPP to them, for instance T M , Hf of melting, T C , and latent heat of crystallization, were found to decrease evidently in all blends with increasing aPP content [39].…”

Section: Resultsmentioning

confidence: 99%

Optimization of Mechanical and Thermal Properties of iPP and LMPP Blend Fibres by Surface Response Methodology

et al. 2018

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Optimization of the mechanical and thermal properties of isotactic polypropylene (iPP) homopolymer blended with relatively new low molecular low modulus polypropylene (LMPP) at different blend ratios was carried out via surface response methodology (RSM). Regression equations for the prediction of optimal conditions were achieved considering eight individual parameters: naming, elongation at break, tensile strength and elastic modulus, crystallization temperature (TC), first melting temperatures (TM1), heat fusion (Hf), crystallinity, and melt flow rate (MFR), which were measured as responses for the design of experiment (DOE). The adjusted and predicted correlation coefficient (R2) shows good agreement between the actual and the predicted values. To confirm the optimal values from the response model, supplementary experiments as a performance evaluation were conducted, posing better operational conditions. It has been confirmed that the RSM model was adequate to reflect the predicted optimization. The results suggest that the addition of LMPP into iPP could effectively enhance the functionality and processability of blend fibres if correctly proportioned.

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Section: Resultsmentioning

confidence: 99%

Optimization of Mechanical and Thermal Properties of iPP and LMPP Blend Fibres by Surface Response Methodology

et al. 2018

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“…It can be divided into two categories according to composition difference: homopolymer polypropylene and copolymer polypropylene [3][4][5]. Meanwhile, it includes three types based on structure difference: isotactic polypropylene, anisotropic polypropylene, and atactic polypropylene [6,7]. Because the biaxial stretch polypropylene (BOPP) film will undergo transverse and longitudinal stretching deformation in the molding process compared with that of the non-stretch film, the arrangement of its molecular chains or chain segments will be changed.…”

Section: Introductionmentioning

confidence: 99%

Study on the Behavior of BOPP Film Treated by Corona Discharge

2020

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Corona discharge is widely used as a good surface pretreatment method for polymer materials. In this work, the attenuated total reflectance Fourier transform infrared spectrometry (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), scanning electronic microscopy (SEM), and atomic force microscopy (AFM) were used to investigate the behavior of biaxially oriented polypropylene (BOPP) film treated by corona discharge. The possibly involved chemical reactions during the corona treatment process under atmosphere components were systematically summarized. This work lays a theoretical basis for improving the performance of BOPP films and expanding their application fields.

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“…It is now well established that free energy barrier of crystal nucleation can be drastically reduced by the application of a flow field to an entangled polymer melt or polymer solution. The so-called “shish-kebab” structure − is the result of such flow-induced crystallization, in which folded-chain lamellar crystals (kebabs) grow perpendicular to highly stretched and oriented fibrillar-like chains (shish) . Recently, to investigate the molecular mechanism for the formation of the shish, many experiments and molecular dynamics simulation of polymer chains have been carried out to explore the early stages of flow-induced nucleation. ,− …”

Section: Introductionmentioning

confidence: 99%

Flow-Induced Dendritic β-Form Isotactic Polypropylene Crystals in Thin Films

et al. 2016

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Flow-induced dendritic β-form isotactic polypropylene (iPP) lamellae in thin films have been investigated using optical microscopy (OM) and atomic force microscopy (AFM). Shear flow in a thin film was induced by scratching supercooled iPP melt with a sharp scalpel at a constant rate. After subsequent isothermal crystallization, an extremely high nucleation density of edge-on α-iPP crystals oriented perpendicular to the flow direction was observed. Increasing shear flow temperature from 130 to 190 °C led to a decrease in both number density of flow-induced edge-on α-iPP lamellae and subsequent β-iPP crystals. Interestingly, two distinct paths for the change in orientation of edge-on crystals could be identified. The most probable route was the transition from edge-on to leaf-shaped α-iPP flat-on crystals. The transition from edge-on α-iPP lamellae to β-iPP flat-on crystals with dendritic shape occurred less frequently. We suggest a stepwise process for flow-induced growth of β-iPP crystals associated with the initial nucleation of edge-on α-iPP crystals via aligned polymer chains induced by flow and a subsequent transition to the growth of β-iPP flat-on crystals.

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Isotactic polypropylene reinforced atactic polypropylene by formation of shish-kebab superstructure

Cited by 20 publications

References 56 publications

Optimization of Mechanical and Thermal Properties of iPP and LMPP Blend Fibres by Surface Response Methodology

Optimization of Mechanical and Thermal Properties of iPP and LMPP Blend Fibres by Surface Response Methodology

Study on the Behavior of BOPP Film Treated by Corona Discharge

Flow-Induced Dendritic β-Form Isotactic Polypropylene Crystals in Thin Films

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