scholarly journals Effects of cooling rates on crystallization behavior and melting characteristics of isotactic polypropylene as neat and in the TPVs EPDM/PP and EOC/PP

2015 ◽  
Vol 44 ◽  
pp. 101-111 ◽  
Author(s):  
Nattapon Uthaipan ◽  
Methakarn Jarnthong ◽  
Zheng Peng ◽  
Banja Junhasavasdikul ◽  
Charoen Nakason ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Crystallization Behavior ◽  
Cooling Rates ◽  
Melting Characteristics

Crystallization behavior and melting characteristics of wollastonite filled β-isotactic polypropylene composites

2012 ◽  
Vol 536 ◽  
pp. 47-54 ◽  
Author(s):  
Qian Ding ◽  
Zishou Zhang ◽  
Chunguang Wang ◽  
Juan Jiang ◽  
Gu Li ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Crystallization Behavior ◽  
Polypropylene Composites ◽  
Melting Characteristics

The effect of cooling rate on crystallization behavior and tensile properties of CF/PEEK composites

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Guangming Dai ◽  
Lihua Zhan ◽  
Chenglong Guan ◽  
Minghui Huang
Keyword(s):  
Cooling Rate ◽  
Crystallization Temperature ◽  
Crystallization Behavior ◽  
Crystalline Polymer ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Cooling Rates ◽  
Control Range ◽  
Temperature Range ◽  
Transverse Tensile

Abstract In this study, the differential scanning calorimetry (DSC) tests were performed to measure the nonisothermal crystallization behavior of carbon fiber reinforced polyether ether ketone (CF/PEEK) composites under different cooling rates. The characteristic parameters of crystallization were obtained, and the nonisothermal crystallization model was established. The crystallization temperature range of the material at different cooling rates was predicted by the model. The unidirectional laminates were fabricated at different cooling rates in the crystallization temperature range. The results showed that the crystallization temperature range shifted to a lower temperature with the increase of cooling rate, the established nonisothermal crystallization model was consistent with the DSC test results. It is feasible to shorten the cooling control range from the whole process to the crystallization range. The crystallinity and transverse tensile strength declined significantly with the increase of the cooling rate in the crystallization temperature range. The research results provided theoretical support for the selection of cooling conditions and temperature control range, which could be applied to the thermoforming process of semi-crystalline polymer matrixed composites to improve the manufacturing efficiency.

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.

Investigation of the crystallization behavior of isotactic polypropylene polymerized with different Ziegler-Natta catalysts

2013 ◽  
Vol 129 (5) ◽  
pp. 2663-2670 ◽  
Author(s):  
Jian Kang ◽  
Jingping Li ◽  
Shaohua Chen ◽  
Hongmei Peng ◽  
Bin Wang ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Crystallization Behavior ◽  
Ziegler Natta Catalysts

Crystallization behavior of isotactic polypropylene/magnesium salt whisker composites modified by compatibilizer PP-g-MAH

2010 ◽  
Vol 103 (2) ◽  
pp. 701-710 ◽  
Author(s):  
Zhiyong Wei ◽  
Wanxi Zhang ◽  
Guangyi Chen ◽  
Jicai Liang ◽  
Ying Chang ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Crystallization Behavior ◽  
Magnesium Salt
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