Crystalline modification and morphology of polypropylene developed under the combined effects of montmorillonite and self-assembly β nucleating agent

2016 ◽  
Vol 135 ◽  
pp. 76-82 ◽  
Author(s):  
Shaohong Shi ◽  
Xiang Zhang ◽  
Yuansen Liu ◽  
Min Nie ◽  
Qi Wang
Keyword(s):  
Self Assembly ◽  
Nucleating Agent ◽  
Combined Effects ◽  
Crystalline Modification

scholarly journals Crystalline modification of a rare earth nucleating agent for isotactic polypropylene based on its self-assembly

2018 ◽  
Vol 5 (5) ◽  
pp. 180247 ◽  
Author(s):  
Yuanming Zhang ◽  
Tingting Sun ◽  
Wei Jiang ◽  
Guangting Han
Keyword(s):  
Hydrogen Bond ◽  
Rare Earth ◽  
Isotactic Polypropylene ◽  
Self Assembly ◽  
Dendritic Structure ◽  
Nucleating Agent ◽  
The Self ◽  
Structure Evolution ◽  
Crystalline Modification ◽  
Assembly Structure

In this paper, the crystalline modification of a rare earth nucleating agent (WBG) for isotactic polypropylene (PP) based on its supramolecular self-assembly was investigated by differential scanning calorimetry, wide-angle X-ray diffraction and polarized optical microscopy. In addition, the relationship between the self-assembly structure of the nucleating agent and the crystalline structure, as well as the possible reason for the self-assembly behaviour, was further studied. The structure evolution of WBG showed that the self-assembly structure changed from a needle-like structure to a dendritic structure with increase in the content of WBG. When the content of WBG exceeded a critical value (0.4 wt%), it self-assembled into a strip structure. This revealed that the structure evolution of WBG contributed to the K β and the crystallization morphology of PP with different content of WBG. In addition, further studies implied that the behaviour of self-assembly was a liquid–solid transformation of WBG, followed by a liquid–liquid phase separation of molten isotactic PP and WBG. The formation of the self-assembly structure was based on the free molecules by hydrogen bond dissociation while being heated, followed by aggregation into another structure by hydrogen bond association while being cooled. Furthermore, self-assembly behaviour depends largely on the interaction between WBG themselves.

Oriented polypropylene cast films consisted of β-transcrystals induced by the nucleating agent self-assembly and its homogeneous membranes with high porosity

Polymer ◽  
2018 ◽  
Vol 151 ◽  
pp. 136-144 ◽  
Author(s):  
Gao-Gao Wu ◽  
Li-Yang Xu ◽  
Wen-Bo Chen ◽  
Chao Ding ◽  
Zheng-Ying Liu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Nucleating Agent ◽  
High Porosity ◽  
Cast Films ◽  
Oriented Polypropylene

Study on the Combined Effects of Solvent Evaporation and Polymer Flow upon Block Copolymer Self-Assembly and Alignment on Topographic Patterns

Langmuir ◽  
2009 ◽  
Vol 25 (23) ◽  
pp. 13551-13560 ◽  
Author(s):  
Thomas G. Fitzgerald ◽  
Richard A. Farrell ◽  
Nikolay Petkov ◽  
Ciara T. Bolger ◽  
Matthew T. Shaw ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Self Assembly ◽  
Solvent Evaporation ◽  
Combined Effects ◽  
Polymer Flow

scholarly journals Crystalline Modification of Isotactic Polypropylene with a Rare Earth Nucleating Agent Based on Ultrasonic Vibration

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1777 ◽  
Author(s):  
Li ◽  
Xin ◽  
Song ◽  
Dong ◽  
Ben ◽  
...  
Keyword(s):  
Rare Earth ◽  
Isotactic Polypropylene ◽  
Nucleating Agent ◽  
Relative Content ◽  
Water Cooling ◽  
Crystalline Modification ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Agent Based ◽  
The Relationship

In this paper, the crystalline modification of isotactic polypropylene (PP) with a rare earth β nucleating agent (WBG) with different ultrasound conditions was investigated by scanning electron microscopy (SEM), wide-angle X-ray diffraction (XRD), and differential scanning calorimetry (DSC). The relationship between the ultrasound conditions and the crystalline structure, as well as the mechanism for the behavior, were revealed. SEM showed that the dispersion of the nucleating agent in the PP matrix was better at shorter ultrasound distances. In addition, the higher the water cooling temperature, the better the nucleating agent was dispersed in the PP matrix. The results of XRD and DSC showed that the crystallinity and the relative content of the β-crystal were increased with nearer ultrasound distance, as well as increased in higher water cooling temperatures. In particular, under the same conditions, the crystallinity and the relative content of the β-crystal after ultrasonic treatment were much higher than those without ultrasound.

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