Effect of different nucleating agent on crystallization kinetics and morphology of polypropylene

An, Yanjie; Wang, Sihan; Shi, Dezhu; Gao, Yuxin; Song, Lei

doi:10.1515/epoly-2019-0005

Cited by 27 publications

(21 citation statements)

References 17 publications

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“…At medium concentration, the shift is 2 K higher, while for the highest concentration it is again 3.5 K lower. Generally, the increase of crystallization temperature equals approximately 12 K, which corresponds well to the increment of the crystallization temperature observed for organic pigments [50], metal salts [51], and other efficient nucleating agents [52].…”

Section: Discussionsupporting

confidence: 68%

Supramolecular Structure of Polypropylene Fibers Extruded with Addition of Functionalized Reduced Graphene Oxide

et al. 2020

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An effective β-nucleating agent for polypropylene crystallization was obtained by the functionalization of reduced graphene oxide with calcium pimelate. The nucleating ability of the modified reduced graphene oxide (rGO-CP) was confirmed during non-isothermal crystallization. In further examinations, the rGO-CP was used as an additive to modify polypropylene fibers. The fibers were extruded in laboratory conditions. Gravity spun fibers containing three different concentrations of the rGO-CP and fibers taken at three different velocities were obtained. The supramolecular structure of the fibers was examined by means of calorimetric and X-Ray Scattering methods (DSC, WAXS, and SAXS). The considerable amount of β-iPP was obtained only in the gravity spun fibers. In the fibers extruded at higher velocities, the diminishing impact of the additive on the fibers structure was revealed. The changes observed in the fiber structure in connection with the impact of the additive on polypropylene crystallization was discussed.

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Section: Discussionsupporting

confidence: 68%

Supramolecular Structure of Polypropylene Fibers Extruded with Addition of Functionalized Reduced Graphene Oxide

et al. 2020

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“…These are the typical diffraction peaks of PP crystalline in the α form. 40 Meanwhile, similar diffraction peaks can be found in all XRD patterns of PP- g- DTT samples with various DTT contents, indicating that the grafting of DTT does not change the crystalline polymorphs of PP.…”

Section: Resultsmentioning

confidence: 59%

Crystallization, Mechanical, and Antimicrobial Properties of Diallyl Cyanuric Derivative-Grafted Polypropylene

Zhao

et al. 2021

ACS Omega

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A functional N -halamine precursor with double bonds, 1-3-diallyl- s -triazine-2,4,6-trione (DTT), was synthesized and grafted onto polypropylene using dicumyl peroxide (DCP) as an initiator via melt blending at 200 °C. The DTT content grafted onto the polypropylene (PP) backbone was depended on both DTT and DCP concentrations in feed. The crystallization temperature of PP increased from 116 °C (neat PP) to 123 °C (10% DTT) with the increasing DTT content. Meanwhile, the crystallization rate and relative crystallinity of PP were significantly increased after introduction of the N -halamine precursor. Moreover, the incorporation of DTT had partial compensation for the decreasing mechanical properties of polypropylene, which resulted from degradation. When the amount of added DTT reached up to 5%, the chlorinated DTT-modified PP sheets were able to kill 10 5–6 cfu/mL Escherichia coli (CMCC 44103) and Staphylococcus aureus (ATCC 6538) within 10 min. The DTT-modified PP with the regenerating antibacterial property may have great potential for application in packaging, filters, and hygienic products.

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“…When the CP concentration was increased, the melting temperature decreased, while the crystallization temperature increased for the composite scaffolds. This set of data suggests that CP nanoparticles may be acting as a nucleation agent in the PCL/PGS polymer matrix [44,45]. SEM micrographs and size distribution of CP-embedded composite fibers depicting their morphological features are shown in Figure 3.…”

Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Oxygen-Releasing Antibacterial Nanofibrous Scaffolds for Tissue Engineering Applications

et al. 2020

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Lack of suitable auto/allografts has been delaying surgical interventions for the treatment of numerous disorders and has also caused a serious threat to public health. Tissue engineering could be one of the best alternatives to solve this issue. However, deficiency of oxygen supply in the wounded and implanted engineered tissues, caused by circulatory problems and insufficient angiogenesis, has been a rate-limiting step in translation of tissue-engineered grafts. To address this issue, we designed oxygen-releasing electrospun composite scaffolds, based on a previously developed hybrid polymeric matrix composed of poly(glycerol sebacate) (PGS) and poly(ε-caprolactone) (PCL). By performing ball-milling, we were able to embed a large percent of calcium peroxide (CP) nanoparticles into the PGS/PCL nanofibers able to generate oxygen. The composite scaffold exhibited a smooth fiber structure, while providing sustainable oxygen release for several days to a week, and significantly improved cell metabolic activity due to alleviation of hypoxic environment around primary bone-marrow-derived mesenchymal stem cells (BM-MSCs). Moreover, the composite scaffolds also showed good antibacterial performance. In conjunction to other improved features, such as degradation behavior, the developed scaffolds are promising biomaterials for various tissue-engineering and wound-healing applications.

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Effect of different nucleating agent on crystallization kinetics and morphology of polypropylene

Cited by 27 publications

References 17 publications

Supramolecular Structure of Polypropylene Fibers Extruded with Addition of Functionalized Reduced Graphene Oxide

Supramolecular Structure of Polypropylene Fibers Extruded with Addition of Functionalized Reduced Graphene Oxide

Crystallization, Mechanical, and Antimicrobial Properties of Diallyl Cyanuric Derivative-Grafted Polypropylene

Oxygen-Releasing Antibacterial Nanofibrous Scaffolds for Tissue Engineering Applications

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