搜索结果: 1-15 共查到“工学 Polypropylene”相关记录47条 . 查询时间(0.14 秒)
Deposition of gum rosin microspheres on polypropylene microfibres used in face masks to enhance their hydrophobic behaviour
Gum rosin Coating Polypropylene Electrospraying Face mask COVID-19
2023/12/11
The present study aims to investigate the effects of gum rosin (GR) microspheres coating over the hydrophobicity of the outer layer of a polypropylene (PP) based surgical face mask. The gum rosin coat...
Sustainable rosin acid ester as internal electron donors in Ziegler-Natta catalysts for synthesis of isotactic polypropylene with high melt flow rate
Bio-derived rosin acid esters internal electron donors Ziegler-Natta catalyst polypropylene polymerization
2023/12/11
In this contribution, novel bio-derived rosin acid ester compounds have been developed and used as internal electron donors to prepare MgCl2?supported titanium catalysts for propylene polymerization. ...
High effects of smoke suppression and char formation of Ni-Mo/Mg(OH)(2)for polypropylene
aromatization catalytic carbonization core-shell hybrids MWCNTs
2023/6/21
The Ni-Mo/Mg(OH)(2)(NMM) hybrid as an efficient flame retardancy and smoke suppression composite for polypropylene (PP) was synthesized through Ni-Mo co-precipitation on the surface of Mg(OH)(2)(MH) h...
Extensional-flow-induced Crystallization of Polypropylene
Extensional-flow-induced Crystallization Polypropylene
2014/10/23
A filament stretching extensional rheometer with a custom-built oven was used to investigate the effect of uniaxial flow on the crystallization of polypropylene. Prior to stretching, samples were heat...
Self-nucleated Crystallization of a Branched Polypropylene
physical gel point gel stiffness
2014/10/21
Long chain branched polypropylene (LCBPP) crystallizes rapidly and with high nucleation density. The origin of this fast crystallization process is not well understood. It has been attributed to its c...
Determination of oxygen permeability of polyethylene and polypropylene nonwoven fabric foils
gas transmisivity equipment construction packaging mulching
2014/2/24
The paper deals with determination of oxygen permeability of the polyethylene and polypropylene foils applied in
mulching and food packaging. The construction of the equipment of measurement of gas ...
Creep and recovery of polypropylene/carbon nanotube composites
Creep and recovery Constitutive behavior Mechanical testing Nanocomposite Carbon nanotube
2015/3/30
The creep and recovery of polypropylene/multi-walled carbon nanotube composites were studied. It was found for thermoplastics in general that the creep strain reduces with decreased temperature, and w...
Aqueous Processes for Dyeing Generic, Unmodified Polypropylene Fiber
Aqueous Processes Dyeing Generic Polypropylene Fiber
2010/9/20
Acid leuco vat dyeings of polypropylene (PP) fabrics in combinations of a trichromatic series of colorants (red, yellow and blue) plus an orange were performed in order to determine the compatibility ...
Performance properties and structure of electrochemically aged polypropylene with a dye addition
Engineering polymers Mechanical properties Thermal properties
2010/8/16
Properties of polymeric materials depend on structural factors of polymer as well as on conditions of exploitation. The structural factors are for example: molecular weight, chemical structure of macr...
Mechanical and structural properties of polypropylene composites filled with graphite flakes
Polymer Filler Crystallization
2009/12/3
Purpose: The goal of the work is to study the polymer matrix composite (PMC) with isostactic Polypropylene (iPP) as a matrix material and graphite as a filler.
Design/methodology/approach: Density an...
Structure of polypropylene parts from multicavity injection mould
Plastic forming Injection moulding polymer structure
2009/12/1
Purpose: The examination of structure of injection moulded parts, coming form different cavities of injection mould with
geometrically balanced runners, was the purpose of this research. The parts we...
Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with Polypropylene
Selective Depolymerization Homolysis Poly(L-lactic acid) Polypropylene
2009/9/2
Blends of poly(L-lactic acid) (PLLA) and polypropylene (PP), which are candidates for the practical use of PLLA, were investigated for selective degradation of PLLA, resulting in quantitative conversi...
Modified Atmosphere Packaging of Cut Welsh Onion : Effect of Micro-Perforated Polypropylene Film Packaging on Chemical Components and Quality Stability of the Vegetable
pre-cut Welsh onion micro-perforated film packaging modified atmosphere packaging
2009/7/8
The chemical components and quality stability of pre-cut Welsh onion wrapped in an unperforated or micro-perforated orientated polypropylene (OPP) film package were evaluated during storage at 10°C. T...
Effect of Polypropylene Film Packaging and Storage Temperature on Chemical Components and Quality Stability of Welsh Onion
welsh onion modified atmosphere packaging temperature
2009/7/7
Chemical components and quality of Welsh onion (Allium fistulosum L.) wrapped roughly or completely heat-sealed with orientated polypropylene (OPP) film were investigated during storage at 5 and 20°C....
Mathematical Modelling of the Pneumatic Melt Spinning of Isotactic Polypropylene. Part III. Computations of the Process Dynamics
melt blowing air-drawing nonwovens polypropylene modelling
2009/6/17
Computer simulation of the pneumatic melt spinning of isotactic polypropylene based on the mathematical model of the process is presented. Two dynamic zones of the air jet-filament interactions along ...