Influence of β-nucleating agent dispersion on the crystallization behavior of isotactic polypropylene

Niu, Hui; Wang, Na; Li, Yang

doi:10.1016/j.polymer.2018.07.030

Cited by 27 publications

(38 citation statements)

References 20 publications

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“…Currently, most studies about the effect of NA concentrations or processing temperature on the structure evolution of NAs were carried out in a simple iPP/NA binary system and under the quiescent conditions. However, in practical processing, some other factors also have influences on the aggregation behaviors of NAs, to name a few, changes in processing conditions, or the addition of substances that interacted with NAs . Nie et al reported that compared to the normal processing conditions, the self‐assembly of TMB‐5 could occur at a lower temperature by injecting supercritical carbon dioxide (scCO 2 ) into iPP/TMB‐5 samples.…”

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

confidence: 99%

“…They explained the reason for easier assembly of NAs was attributed to the viscosity reduction caused by the injection of scCO 2 and the interaction between CO 2 and TMB‐5. In addition to changing the processing conditions, Niu et al embedded Ziegler‐Natta catalyst on the DCHT surface to in‐situ synthesized β‐iPP and achieve the uniform dispersion of NAs in the matrix. Compared with the traditional melting‐blended samples, the aggregation behavior of DCHT in the polymeric sample has dramatically changed.…”

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

confidence: 99%

“…Optical micrographs featuring the dispersion and self‐assembly/recrystallization morphologies of nucleating agent in the iPP melt: B‐1: (A,E); B‐2: (B,F); B‐3: (C,G); B‐4: (D,H); P‐1: (I,M); P‐2: (J,N); P‐3: (K,O); P‐4: (L) the letter B refers to the melting‐blended sample, and the P refers to the polymeric sample. The pictures were taken at 138°C while cooling the samples from different T f with cooling rate of 5°C/minute . Reproduced with permission from Elsevier …”

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

confidence: 99%

“…The pictures were taken at 138°C while cooling the samples from different T f with cooling rate of 5°C/minute . Reproduced with permission from Elsevier…”

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

confidence: 99%

“…Not only the β‐nucleating selectivity but also the nucleation efficiency of NAs was affected by its aggregation structure . Yu et al investigated the effect of NA morphology on crystallization temperature of iPP samples containing TMB‐5 by controlling the NA concentration.…”

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 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 Structure Evolution Of Aromatic Amide Nas In Ipp Meltmentioning

confidence: 99%

“…The pictures were taken at 138°C while cooling the samples from different T f with cooling rate of 5°C/minute . Reproduced with permission from Elsevier…”

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%

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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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3D printing of a composite iPP/quill of chicken feathers functionalized with pimelic acid

et al. 2022

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In this work, the thermomechanical properties of an isotactic polypropylene (iPP)/quill composite were evaluated. This reinforcement was added at 0.5, 1.0 and 5.0 wt% in the iPP matrix. The reinforcement was previously subjected to alkaline treatment with NaOH (QT) and chemical functionalization with pimelic acid (PA) to produce an effective β-crystal nucleating agent. This functionalization was characterized by Fourier transform infrared spectroscopy (FTIR), showing the presence of a new band at 1571 cm À1 associated with the carboxylate group of pimelic acid, indicating a bond between PA and the quill surface. The internal geometry of the specimens obtained by 3D printing were studied by scanning electron spectroscopy (SEM). The effectiveness of the modified reinforcement as a promoter of the β-crystalline phase was evaluated by differential scanning calorimetry (DSC) and wide angle X-ray scattering (WAXD) under non-isothermal crystallization conditions due to the 3D printing process. The composite that showed a higher K β index was 1.0% with a value of 64% by DSC and 65% by WAXD. Furthermore, the thermomechanical properties were characterized by dynamic mechanical analysis (DMA) where, for the 0.5% and 1.0% composites, the storage modulus (E'

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Enhancing the foaming properties of polypropylene/basalt fiber composites by altering their rheological and crystallization behavior via polyethylene–octene blending modification

Zhu,

Shen,

Zeng

et al. 2023

Polymer Composites

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The quality of foam in polypropylene/basalt fiber (PP/BF) composite materials is currently unsatisfactory, which restricts their use in industrial applications. To address this limitation, the objective of this study is to improve the foaming properties of PP/BF composite foam by modifying their rheological and crystallization behavior using polyethylene–octene (POE) blending modification. The results demonstrate that the inclusion of POE has a beneficial impact on the rheological and crystallization characteristics of PP/BF composites. Consequently, this creates favorable conditions for the foaming process of PP/BF composite foam. It is conducive to obtaining high foaming quality PP/BF composite foam. The results demonstrate that a 5 wt% POE content yields the best foaming performance for the PP/BF composite foam, with the most uniform cell distribution, a cell size of 54 μm and a cell density is measured at 3.43 × 107 cells/cm3. The optimal temperature range for foaming is between 180 and 200°C. The introduction of POE in PP/BF composite foam may lead to a decrease in its tensile and flexural strength. However, this drawback is offset by a significant improvement in the notch impact strength of the foam. This study's findings will enhance our understanding of the production and application of PP/BF composite foam, making it a valuable material for applications that require exceptional toughness.Highlights Improved the crystallization and rheological properties of PP/BF composites. Significantly improve the foaming quality of PP/BF composites. Make PP/BF composite foam has excellent impact toughness.

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Influence of β-nucleating agent dispersion on the crystallization behavior of isotactic polypropylene

Cited by 27 publications

References 20 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

3D printing of a composite iPP/quill of chicken feathers functionalized with pimelic acid

Enhancing the foaming properties of polypropylene/basalt fiber composites by altering their rheological and crystallization behavior via polyethylene–octene blending modification

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