Influence of polyfunctional monomer on melt strength and rheology of long-chain branched polypropylene by reactive extrusion

2010 ◽  
pp. NA-NA ◽  
Author(s):  
Feng-Hua Su ◽  
Han-Xiong Huang
Keyword(s):  
Reactive Extrusion ◽  
Melt Strength ◽  
Polyfunctional Monomer ◽  
Branched Polypropylene ◽  
Long Chain ◽  
Long Chain Branched Polypropylene

A new grafting monomer for synthesizing long chain branched polypropylene through melt radical reaction

Polymer ◽  
2012 ◽  
Vol 53 (1) ◽  
pp. 121-129 ◽  
Author(s):  
Zhenjiang Zhang ◽  
Dong Wan ◽  
Haiping Xing ◽  
Zhijie Zhang ◽  
Haiying Tan ◽  
...  
Keyword(s):  
Radical Reaction ◽  
Branched Polypropylene ◽  
Long Chain ◽  
Long Chain Branched 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.

scholarly journals Synergistic lignin construction of a long-chain branched polypropylene and its properties

RSC Advances ◽  
2020 ◽  
Vol 10 (62) ◽  
pp. 38120-38127
Author(s):  
Bo Tian ◽  
Jinfeng Li ◽  
Zhigang Li ◽  
Ningdi Xu ◽  
Gang Yao ◽  
...  
Keyword(s):  
Chain Branching ◽  
Long Chain Branching ◽  
Foaming Property ◽  
Branched Polypropylene ◽  
Long Chain ◽  
Long Chain Branched Polypropylene

Polypropylene with long chain branching behavior was constructed by lignin, which foaming property and polarity were improved.

Effect of leaving group in dithiocarbamates on mediating melt radical reaction during preparing long chain branched polypropylene

Polymer ◽  
2012 ◽  
Vol 53 (4) ◽  
pp. 947-955 ◽  
Author(s):  
Haiping Xing ◽  
Zhiwei Jiang ◽  
Zhenjiang Zhang ◽  
Jian Qiu ◽  
Yanhui Wang ◽  
...  
Keyword(s):  
Radical Reaction ◽  
Leaving Group ◽  
Branched Polypropylene ◽  
Long Chain ◽  
Long Chain Branched Polypropylene

Oriented crystallization of long chain branched polypropylene induced by step-shear deformation in pre-crystallization regime

Polymer ◽  
2017 ◽  
Vol 116 ◽  
pp. 395-402 ◽  
Author(s):  
Shinichi Kitade ◽  
Hideo Kurihara ◽  
Kazuo Asuka ◽  
Satoshi Katsuno ◽  
Isamu Akiba ◽  
...  
Keyword(s):  
Shear Deformation ◽  
Oriented Crystallization ◽  
Branched Polypropylene ◽  
Long Chain ◽  
Long Chain Branched Polypropylene
Sign in / Sign up

Export Citation Format

Share Document