Theory of Crystals and Interfaces in Polyethylene and Isotactic Polypropylene

Feng, Jianguang; Zhou, Hongfu; Wang, Xiangdong; Mi, Jianguo

doi:10.1021/acs.jpcc.6b00376

Cited by 6 publications

(4 citation statements)

References 52 publications

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“…Reid et al have also reported iPP crystallization when it is infiltrated within 15 nm pores . According to the simulation of Feng et al, the critical nuclei are fibrillar-like with a radius of ∼6 Å (interchain direction) and a height of ∼27 Å (along the chain) for iPP at 300 K. Therefore, the AAO templates with nanopores larger than those sizes are able to provide enough space for the nucleation of iPP.…”

Section: Resultsmentioning

confidence: 99%

Reexamining the Crystallization of Poly(ε-caprolactone) and Isotactic Polypropylene under Hard Confinement: Nucleation and Orientation

Shi

Liu

et al. 2017

Macromolecules

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The crystallization of poly(ε-caprolactone) (PCL) and isotactic polypropylene (iPP) infiltrated in nanoporous anodic alumina oxide (AAO) templates was reexamined to demonstrate the importance of obtaining polymer-free, clean AAO surfaces on the nucleation, size dependence of crystallization temperature (T c), and texture. The AAO pore diameters cover a broad range from 400 to 20 nm. When the AAO templates were completely free of any residual polymer on their surfaces, differential scanning calorimetry (DSC) experiments exhibited a single crystallization peak for all the samples with different AAO pore sizes. A drastic decrease in T c with density of domains indicated a transition from heterogeneous to homogeneous/surface nucleation. A regular decrease of T c with pore size was observed in the low T c regime, as a result of the volume dependence of nucleation events. The chain alignment of the two polymers infiltrated in AAO was studied by two-dimensional wide-angle X-ray scattering (WAXS). By comparing the experimental and simulated WAXS patterns, the orientation modes of the polymers were identified and compared with previous studies.

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Section: Resultsmentioning

confidence: 99%

Reexamining the Crystallization of Poly(ε-caprolactone) and Isotactic Polypropylene under Hard Confinement: Nucleation and Orientation

Shi

Liu

et al. 2017

Macromolecules

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“…[51] 6 ] y in air is found to be more active than CoFe 2 O 4 and other ironbased materials. [52] Except for Co x Fe 3Àx O 4 , the activity of iron-manganese based bimetal oxide MnFe 2 O 4 , whose activity Table 4. O 2 yield and TOF in photocatalytic water oxidation catalysed by metal oxides based on earth-abundant transition metals.…”

Section: Activity Improvement Of Single Metal Oxide By Doping Single mentioning

confidence: 99%

Catalysts Based on Earth‐Abundant Metals for Visible Light‐Driven Water Oxidation Reaction

Lin

Han

Ding

2018

The Chemical Record

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Exploration of water oxidation catalyst (WOC) with excellent performance is the key for the overall water splitting reaction, which is a feasible strategy to convert solar energy to chemical energy. Although some compounds composed of noble metals, mainly Ru and Ir, have been reported to catalyze water oxidation with high efficiency, catalysts based on low-cost and earth-abundant transition metals are essential for realizing economical and large-scale light-driven water splitting. Various WOCs containing earth-abundant metals (mainly Mn, Fe, Co, Ni, Cu) have been utilized for visible light-driven water oxidation in recent years. In this Personal Account, we summarize our recent developments in WOCs based on earth-abundant transition metals including polyoxometalates (POMs), metal oxides or bimetal oxides, and metal complexes containing multidentate ligand scaffolds for visible light-driven water oxidation reaction.

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“…Polypropylene (PP), one of the typical plastics, has a high yield, low price, and wide applications. , In terms of its performance, the electrical insulation, chemical resistance, and processability are excellent. , The mechanical properties and heat resistance of PP are the highest among general plastics. Like most polymers, PP exhibits serious disadvantages including its inherent flammability and large production of toxic smoke.…”

Section: Introductionmentioning

confidence: 99%

An Environmentally Friendly Nanohybrid Flame Retardant with Outstanding Flame-Retardant Efficiency for Polypropylene

Wang

Chen

et al. 2021

J. Phys. Chem. C

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A facile method to fabricate nanohybrid flame retardants has become increasingly important to enhance the flame-retardant efficiency and adhesion in interfaces between polymer matrix and the flame retardants. Polypropylene (PP) is a vital thermoplastic polymer family member; however, its flame retardancy remains a big challenge because of its other seriously deteriorated properties. In this present work, an environmentally friendly nanohybrid expandable graphite (nHEG) has been successfully designed and synthesized in situ via a one-pot strategy of the first flame-retardant PP by introducing nano-SiO2 particles into the surface and interlamination of graphite lamellas. The performance of PP composites is modulated through regulating nHEG content and nano-SiO2 distribution as the catalytic charring agent, and expandable graphite (EG) is used to be the flame-retardant unit in the synthesis process. PP composites obtain the UL-94 V0 rating by the UL-94 test. The enhanced flame retardancy can be attributable to the formation of continuous and tight char residues. The sample with the highest flame retardancy maintains a tensile strength of 32.7 MPa and 9.3 kJ/m2 of notched impact strength, respectively. Therefore, the nanohybrid flame-retardant PP composites show extensive applications.

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Theory of Crystals and Interfaces in Polyethylene and Isotactic Polypropylene

Cited by 6 publications

References 52 publications

Reexamining the Crystallization of Poly(ε-caprolactone) and Isotactic Polypropylene under Hard Confinement: Nucleation and Orientation

Reexamining the Crystallization of Poly(ε-caprolactone) and Isotactic Polypropylene under Hard Confinement: Nucleation and Orientation

Catalysts Based on Earth‐Abundant Metals for Visible Light‐Driven Water Oxidation Reaction

An Environmentally Friendly Nanohybrid Flame Retardant with Outstanding Flame-Retardant Efficiency for Polypropylene

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