On the physical behavior of isotactic polypropylene fibers extruded at different draw-down ratios. I. Optical properties and cold-drawing

2009 ◽  
Vol 49 (11) ◽  
pp. 2116-2124 ◽  
Author(s):  
Hassan M. El-Dessouky ◽  
Mohammad R. Mahmoudi ◽  
Carl A. Lawrence ◽  
Khaled M. Yassien ◽  
Taha Z.N. Sokkar ◽  
...  
Keyword(s):  
Optical Properties ◽  
Isotactic Polypropylene ◽  
Cold Drawing ◽  
Polypropylene Fibers ◽  
Physical Behavior

On the physical behavior of isotactic polypropylene fibers extruded at different draw-down ratios: II. Structure and properties

2009 ◽  
Vol 50 (1) ◽  
pp. 200-208 ◽  
Author(s):  
Hassan M. El-Dessouky ◽  
Mohammad R. Mahmoudi ◽  
Carl A. Lawrence ◽  
Eric L.V. Lewis ◽  
Alison M. Voice ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Polypropylene Fibers ◽  
Structure And Properties ◽  
Physical Behavior

scholarly journals Optical Properties of Polypropylene upon Recycling

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Felice De Santis ◽  
Roberto Pantani
Keyword(s):  
Optical Properties ◽  
Rheological Properties ◽  
Isotactic Polypropylene ◽  
Food Packaging ◽  
Polymeric Materials ◽  
Optical Characteristics ◽  
Cooling Rates ◽  
Commercial Grade

In the last few years there has been an increasing interest in the possibility of recycling polymeric materials, using physical recycling. However, is it well known that polymers experience a depletion of all the properties upon recycling. These effects have been widely characterized in the literature for what concerns the mechanical or rheological properties. The changes of optical properties after recycling have been much less studied, even if, especially in food packaging, optical characteristics (above all the opacity) are of extreme importance, and thus it is quite significant to assess the effect of recycling on these properties. In this work, the influence of recycling steps on the opacity of films of a commercial grade of isotactic polypropylene (i-PP) was studied. The material was extruded several times to mimic the effect of recycling procedures. After extrusion, films were obtained by cooling samples of material at different cooling rates. The opacity of the obtained films was then measured and related to their crystallinity and morphology. It was found that opacity generally increases on increasing the amount ofαphase and for the same amount ofαphase on increasing the size of the spherulites.

The influence of nucleus density on optical properties in nucleated isotactic polypropylene

2009 ◽  
Vol 45 (11) ◽  
pp. 3138-3148 ◽  
Author(s):  
Alfréd Menyhárd ◽  
Markus Gahleitner ◽  
József Varga ◽  
Klaus Bernreitner ◽  
Pirjo Jääskeläinen ◽  
...  
Keyword(s):  
Optical Properties ◽  
Isotactic Polypropylene ◽  
Nucleus Density

Time-Dependent Properties of Isotactic Polypropylene Fibers

1999 ◽  
Vol 879 (1 TEMPOS IN SCI) ◽  
pp. 220-223
Author(s):  
G. BARRA ◽  
C. D'ANIELLO ◽  
R. RUSSO ◽  
V. VITTORIA
Keyword(s):  
Isotactic Polypropylene ◽  
Time Dependent ◽  
Polypropylene Fibers

Electrospun isotactic polypropylene fibers: Self-similar morphology and microstructure

Polymer ◽  
2013 ◽  
Vol 54 (12) ◽  
pp. 3117-3123 ◽  
Author(s):  
Shuangyang Liu ◽  
Yanyan Liang ◽  
Yabo Quan ◽  
Kun Dai ◽  
Guoqiang Zheng ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Polypropylene Fibers ◽  
Similar Morphology ◽  
Self Similar

Preparation, Characterization of Substituted Aromatic Heterocyclic Phosphate Salts and the Application in Isotactic Polypropylene

2013 ◽  
Vol 652-654 ◽  
pp. 463-469
Author(s):  
Li Juan Long ◽  
Wen Tao He ◽  
Min Min Zhang ◽  
Kai Zhang ◽  
Min He ◽  
...  
Keyword(s):  
Optical Properties ◽  
Isotactic Polypropylene ◽  
Crystallization Temperature ◽  
Nucleating Agent ◽  
Nucleating Agents ◽  
Absorption Bands ◽  
Nucleation Effect ◽  
Stretching Vibration ◽  
Phosphate Salts ◽  
Aromatic Heterocyclic

Substituted aromatic heterocyclic phosphate salts were synthesized by a new method and characterized by fourier transform infrared spectroscopy(FT-IR) and thermogravimetry (TG) method. The characteristic absorption bands ascribed to the stretching vibration of P=O group and P-O group verify the successful synthesis of substituted aromatic heterocyclic phosphate salts. When compared with sodium salt, the thermal stability of other salts declines. Their nucleation effects on isotactic polypropylene(iPP) were investigated with differential scanning calorimeter(DSC) and influences on mechanical, optical properties of iPP were also studied. The DSC result shows that with 0.15wt% nucleating agents incorporated into iPP, monovalent salts have a good performance, bivalent salts have less nucleation effect on the crystallization temperature. But the mass fraction of crystallinity of iPP with manganese salt could be increased by 5.2% even it has a weak ability relatively on crystallization temperature. And the mechanical and optical properties of iPP with manganese salt almost reach to iPP containing lithium salt. The results demonstrate that bivalent manganses salt is a kind of new effective nucleating agent when designing compound nucleating agents.

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