Effect of die geometry on foaming behaviors of high-melt-strength polypropylene with CO2

2008 ◽  
Vol 109 (5) ◽  
pp. 3122-3132 ◽  
Author(s):  
Patrick C. Lee ◽  
Wanrudee Kaewmesri ◽  
Jing Wang ◽  
Chul B. Park ◽  
Jantrawan Pumchusak ◽  
...  
Keyword(s):  
Melt Strength ◽  
Die Geometry ◽  
High Melt Strength Polypropylene

Mechanisms of ductile tear in blown film from blends of polyethylene and high melt strength polypropylene

Polymer ◽  
2002 ◽  
Vol 43 (24) ◽  
pp. 6515-6526 ◽  
Author(s):  
A.C Chang ◽  
S.P Chum ◽  
A Hiltner ◽  
E Baer
Keyword(s):  
Melt Strength ◽  
Blown Film ◽  
High Melt Strength Polypropylene

Development of high melt strength polypropylene and its application in thermoplastic elastomeric composition

2021 ◽  
pp. 009524432110510
Author(s):  
Mousumi De Sarkar ◽  
Nishant Chandel ◽  
Shib Shankar Banerjee ◽  
Subhabrata Saha ◽  
Anil K Bhowmick ◽  
...  
Keyword(s):  
Fixed Ratio ◽  
Reactive Extrusion ◽  
Extrusion Process ◽  
Structure Property ◽  
Chain Branching ◽  
Melt Strength ◽  
Long Chain Branching ◽  
Zinc Diethyldithiocarbamate ◽  
Long Chain ◽  
High Melt Strength Polypropylene

High melt strength polypropylene (HMS-PP) with a long-chain branched structure is a modified form of polypropylene (PP) which has basic properties of regular PP but with superior melt drawability. This paper reports on the development of gel-free HMS-PP from a linear isotactic PP through the introduction of long-chain branching on its backbone via a reactive extrusion process, using dicetyl-peroxydicarbonate (PODIC) alone or in combination with a coagent. The melt strength and the mechanical properties such as impact and flexural strength of PP showed improvements with the modification with PODIC. 5000 ppm by weight of PODIC was found to provide the best balance of properties. The efficacies of zinc diethyldithiocarbamate (ZDC) and tetramethyl thiuram disulphide (TMTD) as coagents in combination with PODIC to augment properties of HMS-PP further were explored. TMTD offered slightly enhanced performance benefits as compared to ZDC at an optimized concentration of 100 ppm by weight. The application potential of HMS-PP in thermoplastic elastomeric blends of HMS-PP with ethylene-propylene-diene monomer (EPDM) rubber at a fixed ratio of 35/65 by weight was also investigated. Structure-property correlations were established between the extent of long-chain branching in the modified PP and the properties of the resultant thermoplastic elastomeric composition.

Production of high melt strength polypropylene by gamma irradiation

2007 ◽  
Vol 76 (11-12) ◽  
pp. 1691-1695 ◽  
Author(s):  
A.B. Lugão ◽  
B.W.H. Artel ◽  
A. Yoshiga ◽  
L.F.C.P. Lima ◽  
D.F. Parra ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Melt Strength ◽  
High Melt Strength Polypropylene

Preparation of high melt strength polypropylene by addition of an ionically modified polypropylene

Polymer ◽  
2020 ◽  
Vol 202 ◽  
pp. 122743 ◽  
Author(s):  
Meng-Heng Wu ◽  
Cheng-Chien Wang ◽  
Chuh-Yung Chen
Keyword(s):  
Melt Strength ◽  
High Melt Strength Polypropylene

Characterization of high melt strength polypropylene synthesized via silane grafting initiated byin situheat induction reaction

2008 ◽  
Vol 110 (6) ◽  
pp. 3727-3732 ◽  
Author(s):  
Yanjie An ◽  
Zhenjiang Zhang ◽  
Wuguo Bi ◽  
Yanhui Wang ◽  
Tao Tang
Keyword(s):  
Melt Strength ◽  
High Melt Strength Polypropylene
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