Unique crystallization behavior of isotactic polypropylene in the presence of l‐isoleucine and its inhibition and promotion mechanism of nucleation
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Applied Polymer Science"
DOI: 10.1002/app.45956
Abstract: l-Isoleucine (l-Ile) was identified as an efficient anti-nucleating agent for isotactic polypropylene (iPP). At 0.08 wt %, l-Ile could significantly decrease the peak crystallization temperature (Tcp) of iPP by up to 8 °C at a cooling… read more here.
Keywords: mechanism; ile; crystallization; unique crystallization ... See more keywords
Effect of microstructure tuning by rapid heat cycle molding on the photodegradation behavior of isotactic polypropylene
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Applied Polymer Science"
DOI: 10.1002/app.55118
Abstract: Rapid heat cycling molding (RHCM) is an injection molding technique that improves the product quality of isotactic polypropylene (iPP) by tuning the microstructure, but its effect on the photodegradation stability remains to be investigated. In… read more here.
Keywords: rapid heat; effect; photodegradation; isotactic polypropylene ... See more keywords
Fiber Spinning of Ultrahigh Molecular Weight Isotactic Polypropylene: Melt Spinning and Melt Drawing.
Sign Up to like & getrecommendations! Published in 2023 at "ChemPlusChem"
DOI: 10.1002/cplu.202300045
Abstract: Herein, we report fiber spinning of tailored isotactic polypropylene (iPP) by melt spinning and melt drawing, yielding an adjustable diameter of 40 - 400 μm. The crystallinity of all obtained fibers with a molecular weight… read more here.
Keywords: fiber spinning; isotactic polypropylene; melt spinning; molecular weight ... See more keywords
Structural Characteristics of Fibrillar Crystals in Uniaxially Stretched Isotactic Polypropylene Dominated by Temperature and Strain
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DOI: 10.1002/mame.202300448
Abstract: The spherulitic morphology of isotactic polypropylene can be transformed into the oriented fibrillar morphology through hot stretching processes with varying temperature (Ts) or altering strain (εt). The effects of Ts and εt on the structural characteristics of… read more here.
Keywords: temperature; characteristics fibrillar; fibrillar crystals; structural characteristics ... See more keywords
Hierarchical Glass Fiber Superstructures with Supramolecular Nanofibers for the Nucleation of Isotactic Polypropylene
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DOI: 10.1002/mame.202400389
Abstract: Supramolecular additives are an established class of nucleating agents to modify and control the solid‐state morphology of semi‐crystalline polymers, in particular isotactic polypropylene (iPP). A widely used reinforcement material for iPP is glass fibers (GFs),… read more here.
Keywords: ipp; glass; hierarchical superstructures; isotactic polypropylene ... See more keywords
A Criterion for Flow-Induced Oriented Crystals in Isotactic Polypropylene under Pressure.
Sign Up to like & getrecommendations! Published in 2017 at "Macromolecular rapid communications"
DOI: 10.1002/marc.201700407
Abstract: Flow-induced oriented crystals have attracted considerable attention because they significantly increase stiffness and strength of polymer products. Naturally, understanding the necessary condition of forming oriented crystals is of importance for both industry and polymer physics.… read more here.
Keywords: crystals isotactic; oriented crystals; induced oriented; flow induced ... See more keywords
Modification of isotactic polypropylene by silica nanocapsules via melt blending method
Sign Up to like & getrecommendations! Published in 2018 at "Polymer Composites"
DOI: 10.1002/pc.23995
Abstract: Isotactic polypropylene (iPP) fibers containing silica nanocapsules (described as SNCs) were prepared with twin-screw extruder. Modification of silica nanocapsules was hydrolyzed with octadecyltrimethoxysilane in order to improve the interaction between capsules and the hydrophobic PP… read more here.
Keywords: microscopy; ipp; silica; silica nanocapsules ... See more keywords
Influences of the chemical defects on the crystal thickness and their melting of isothermally crystallized isotactic polypropylene
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Polymer Research"
DOI: 10.1007/s10965-017-1304-6
Abstract: Ziegler-Natta and Metallocene Catalysis isotactic polypropylene with different chemical defects were isothermally crystallized at various crystallization temperatures. The crystal thickness and their corresponding melting behavior were studied using small angle X-ray scattering, atomic force microscopy,… read more here.
Keywords: microscopy; thickness melting; crystallization; isotactic polypropylene ... See more keywords
Effect of chemical structure of hydrazide compounds on nucleation effect in isotactic polypropylene
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DOI: 10.1007/s10965-019-1970-7
Abstract: A series of hydrazide compounds were synthesized and employed as nucleating agents for isotactic polypropylene (iPP). The effect of different structures of hydrazide compounds on the crystallization and melting behaviour of iPP was studied by… read more here.
Keywords: nucleation effect; effect; hydrazide compounds; isotactic polypropylene ... See more keywords
Competitive growth of α- and β-transcrystallinity in isotactic polypropylene induced by the multilayered distribution of α-nucleating agents: Toward high mechanical performances
Sign Up to like & getrecommendations! Published in 2019 at "Chemical Engineering Journal"
DOI: 10.1016/j.cej.2018.08.162
Abstract: Abstract Multilayer materials containing alternating layers of isotactic polypropylene (iPP) and α-nucleating agent (NA)-filled iPP (PPN) were fabricated. Structural analysis presented that a sandwich structure of transcrystallinity (TC)/α-spherulites/TC was generated in each iPP layer and… read more here.
Keywords: growth; layer; multilayered distribution; competitive growth ... See more keywords
In-situ X-ray scattering study of isotactic polypropylene/graphene nanocomposites under shear during fused deposition modeling 3D printing
Sign Up to like & getrecommendations! Published in 2020 at "Composites Science and Technology"
DOI: 10.1016/j.compscitech.2020.108227
Abstract: Abstract Complementary techniques were applied to characterize the structure property relationships of FDM printed isotactic polypropylene/graphene nanocomposites. Raman spectroscopy indicated that graphene was mostly exfoliated during the nozzle extrusion process. Rheological measurements of the viscosity… read more here.
Keywords: polypropylene graphene; graphene nanocomposites; graphene; structure ... See more keywords