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

Shi, Shaohong; Zhang, Xiang; Liu, Yuansen; Nie, Min; Wang, Qi

doi:10.1016/j.compscitech.2016.09.014

Cited by 30 publications

(11 citation statements)

References 43 publications

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“…Even though the aforementioned factors exhibit obvious influence on the crystallization and polymorph behavior of iPBu, the introduction of selective nucleation agents is most widely used method for preparation of samples of required crystal modification through heterogeneous nucleation [ 27 , 95 , 96 , 97 , 98 , 99 , 100 , 101 , 102 , 103 , 104 ]. The heterogeneous nucleation mechanism can be different depending on the interacting system and crystallization conditions.…”

Section: Crystal Structural Control Of Ipbumentioning

confidence: 99%

Polymorphic Behavior and Phase Transition of Poly(1-Butene) and Its Copolymers

et al. 2018

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The properties of semicrystalline polymeric materials depend remarkably on their structures, especially for those exhibiting a polymorphic behavior. This offers an efficient way to tailor their properties through crystal engineering. For control of the crystal structure, and therefore the physical and mechanical properties, a full understanding of the polymorph selection of polymers under varied conditions is essential. This has stimulated a mass of research work on the polymorphic crystallization and related phase transformation. Considering that the isotactic poly(1-butene) (iPBu) exhibits pronounced polymorphs and complicated transition between different phases, the study on its crystallization and phase transformation has attracted considerable attention during the past decades. This review provides the context of the recent progresses made on the crystallization and phase transition behavior of iPBu. We first review the crystal structures of known crystal forms and then their formation conditions and influencing factors. In addition, the inevitable form II to form I spontaneous transition mechanism and the transformation kinetics is reviewed based on the existing research works, aiming for it to be useful for its processing in different phases and the further technical development of new methods for accelerating or even bypass its form II to form I transformation.

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Section: Crystal Structural Control Of Ipbumentioning

confidence: 99%

Polymorphic Behavior and Phase Transition of Poly(1-Butene) and Its Copolymers

et al. 2018

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“…In these techniques, the addition of b-nucleating agent is the most simple and convenient method to form the b-crystals and improve the crystallization ability of semicrystalline polymer. For example, various types of compounds have been used as b-nucleating agent for preparation of b-form isotactic polypropylene (iPP), such as organic carboxylate metal salts, [36][37][38] the rare earth b-nucleating agents, [39][40][41] aryl amide compounds [42][43][44][45] and so on. Sheng et al 40 found that three types of b-crystalline morphologies are sequentially generated by adding a rare earth b-nucleating agent (WBG-II), which not only increased the overall crystallinity and the proportion of b-crystals, but also improved the toughness.…”

Section: Introductionmentioning

confidence: 99%

Influence of different β-nucleation agents on poly(l-lactic acid): structure, morphology, and dynamic mechanical behavior

Zou

Dong

et al. 2017

RSC Adv.

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“…It is accepted that self-assembled structure of the β-nucleating agent is related with its solubility in the polymer melt [ 23 , 24 ]. According to the thermodynamic analyses of WBG and PP ( figure 2 ), we found that when WBG is heated from room temperature to 450°C, two endothermic peaks of WBG appear at 56°C and 107°C, respectively.…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2018

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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 Kβ 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.

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

Cited by 30 publications

References 43 publications

Polymorphic Behavior and Phase Transition of Poly(1-Butene) and Its Copolymers

Polymorphic Behavior and Phase Transition of Poly(1-Butene) and Its Copolymers

Influence of different β-nucleation agents on poly(l-lactic acid): structure, morphology, and dynamic mechanical behavior

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

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