Polypropylene films with high barrier performance via crystal morphology manipulation

Chen, Yanhui; Yang, Haoqing; Song, Yang; Ren, Penggang; Zhang, Qiuyu; Li, Zhong‐Ming

doi:10.1007/s10853-017-0789-z

Cited by 14 publications

(16 citation statements)

References 40 publications

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“…Some researchers studied the β‐nucleating selectivity of dot‐like NAs by DSC, and found that there were two endothermic peaks on the DSC melting curves of iPP samples containing dot‐like NAs, corresponding to the melting of α‐crystals and β‐crystals, respectively. This result implied that dot‐like NA could induce the formation of both α‐ and β‐modification, namely showing the dual‐nucleating ability …”

Section: The Effects Of Diverse Agglomerates On β‐Nucleation Ability mentioning

confidence: 90%

“…In the open literature, considerable efforts have been made to explore the effects of experimental conditions and NA concentration on the aggregation morphology of aromatic amide NAs . The pioneer work by Vagra et al systematically investigated the formation of supermolecular structure of NJS by varying the NA concentrations and the final heating temperature, and found four characteristic morphologies including needle‐like, dendritic, microcrystalline, and “flower”‐like agglomerates, as shown in Figure .…”

Section: The Structure Evolution Of Aromatic Amide Nas In Ipp Meltmentioning

confidence: 99%

“…As mentioned above, the effect of processing temperature on the agglomerate morphology has also attracted steady research interests. Chen et al prepared iPP samples containing 0.05 wt% TMB‐5 with three kinds of NA aggregation morphologies by varying the molding temperature. They reported that the TMB‐5 presented the dispersed dot particles in the sample annealed at 185°C, and showed anisotropic needle‐like crystals after being treated at 210°C.…”

Section: The Structure Evolution Of Aromatic Amide Nas In Ipp Meltmentioning

confidence: 99%

“…Numerous studies have demonstrated that DCNDCA and DCHT represented dual nucleation selectivity, and the aromatic amide NAs with diverse aggregation structures exhibited different β‐nucleating selectivity . In this section, we would focus on the dual‐nucleation effect of NAs with diverse morphologies and the effect of different agglomerates on their β‐nucleating selectivity.…”

Section: The Effects Of Diverse Agglomerates On β‐Nucleation Ability mentioning

confidence: 99%

“…As mentioned above, at a high concentration and/or a low T f (NAs could not dissolve into the melt), NAs exhibited dot‐like structure in the molten matrix upon heating and cooling. It was reported that the dot‐like NAs could promote the crystallization of iPP into β‐spherulites . Some researchers studied the β‐nucleating selectivity of dot‐like NAs by DSC, and found that there were two endothermic peaks on the DSC melting curves of iPP samples containing dot‐like NAs, corresponding to the melting of α‐crystals and β‐crystals, respectively.…”

Section: The Effects Of Diverse Agglomerates On β‐Nucleation Ability mentioning

confidence: 99%

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Structure evolution upon heating and cooling and its effects on nucleation performance: A review on aromatic amide β‐nucleating agents for isotactic polypropylene

Yang

Feng

2019

Polymer Crystallization

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The β‐nucleating agent (NA) is one of the most important additives for isotactic polypropylene. In the practical processing, the introduction of NA into the polymer is usually by melt blending, and the “real” structure of NA inducing the crystallization of polymer is not necessarily the same as the pristine structure before processing. Up to now, numerous researches regarding the structure evolution of β‐NAs and the effect on the β‐nucleating ability have been done. A systematic integration on results and conclusions is valuable for deeply understanding the structure‐nucleating performance relationships of β‐NAs. This review provides an overview on recent researches of aromatic amide NAs, a kind of extensively studied β‐NA, and focuses on their structure evolution in the polymer melt, including the dispersion process upon heating and aggregation phenomenon upon cooling, as well as the effects of diverse agglomerates on their β‐nucleating abilities. Finally, a brief summary and an outlook are proposed.

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Section: The Effects Of Diverse Agglomerates On β‐Nucleation Ability mentioning

confidence: 90%

Section: The Structure Evolution Of Aromatic Amide Nas In Ipp Meltmentioning

confidence: 99%

Section: The Structure Evolution Of Aromatic Amide Nas In Ipp Meltmentioning

confidence: 99%

Section: The Effects Of Diverse Agglomerates On β‐Nucleation Ability mentioning

confidence: 99%

Section: The Effects Of Diverse Agglomerates On β‐Nucleation Ability mentioning

confidence: 99%

See 3 more Smart Citations

Structure evolution upon heating and cooling and its effects on nucleation performance: A review on aromatic amide β‐nucleating agents for isotactic polypropylene

Yang

Feng

2019

Polymer Crystallization

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High‐pressure induced formation of isotactic polypropylene mesophase: Synergistic effect of pressure and pressurization rate

Huang

Shao

et al. 2018

Polymer Engineering & Sci

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The crystallization induced by high pressures up to 2 GPa was studied for isotactic polypropylene (iPP) using wide angle X-ray diffraction, small angle X-ray scattering, and atomic force microscopy methods. The iPP mesophase can be induced at 200 C by high pressures with fast pressurization rate. A pressure-pressurization rate kinetic phase diagram of mesophase and γ-phase was established to systematically analyze the influences of pressure and pressurization rate on crystallization polymorphism. Under pressure not higher than 0.75 GPa, only γ-phase is formed, even the pressurization rate reaches 5 × 10 3 MPa/s. With increasing pressure to 1.0 GPa, the mesophase is possible to be generated. As pressure further increases to 1.5 GPa and higher, the pure mesophase system can be obtained for pressurization rate above the critical values (about 10 MPa/s). Moreover, the structure of iPP mesophase obtained by rapid pressurization was analyzed and compared with that prepared by temperature quenching. Also interestingly, the pressure-induced mesophase can transform into γ-phase by annealing under pressure at 200 C, and the rate of this phase transition is slowed down with increasing annealing pressure. POLYM. ENG. SCI., 59:439-446, 2019.

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Phase transitions of the rapid‐compression‐induced mesomorphic isotactic polypropylene under high‐pressure annealing

Jia

et al. 2019

J Polym Sci B Polym Phys

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The mesomorphic isotactic polypropylene was prepared by rapid compression instead of the common method of temperature quenching, and their phase transition under high pressure was investigated in depth by combining wide‐angle X‐ray diffraction, small‐angle X‐ray scattering, and differential scanning calorimetry techniques. It was found that annealing under pressure can promote the further arrangement of chain segments of the mesophase toward the crossed state in the orthorhombic γ‐phase, and the long period of the mesophase slightly decreased from 8.2 to 7.2 nm. The kinetics of this meso‐γ transition strongly depends on pressure. As annealing pressure increased, the mobility of molecular segments was reduced, and then the onset and finishing time of phase transition were both delayed significantly. A critical annealing pressure was found between 1.6 and 1.75 GPa, which determines whether the phase transition occurs or not. When pressure reaches 1.75 GPa, mesophase did not transform at all within 120 min. Based on the results, a reasonable mechanism was proposed to show the crystallization process of mesophase under high‐pressure annealing. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 651–661

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Polypropylene films with high barrier performance via crystal morphology manipulation

Cited by 14 publications

References 40 publications

Structure evolution upon heating and cooling and its effects on nucleation performance: A review on aromatic amide β‐nucleating agents for isotactic polypropylene

Structure evolution upon heating and cooling and its effects on nucleation performance: A review on aromatic amide β‐nucleating agents for isotactic polypropylene

High‐pressure induced formation of isotactic polypropylene mesophase: Synergistic effect of pressure and pressurization rate

Phase transitions of the rapid‐compression‐induced mesomorphic isotactic polypropylene under high‐pressure annealing

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