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

Mousumi De Sarkar; Nishant Chandel; Shib Shankar Banerjee; Subhabrata Saha; Anil K. Bhowmick; Surendra Gupta; Madhumita Saroop

doi:10.1177/00952443211051010

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

Mousumi De Sarkar, Nishant Chandel, Shib Shankar Banerjee, Subhabrata Saha, Anil K. Bhowmick, Surendra Gupta, Madhumita Saroop

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	429-456
Number of pages	28
Journal	Journal of Elastomers and Plastics
Volume	54
Issue number	3
DOIs	https://doi.org/10.1177/00952443211051010
State	Published - Apr 2022
Externally published	Yes

Funding

The authors like to extend their sincere thanks to the Indian Institute of Technology, Kharagpur, India and Reliance Industries Ltd, India, for providing the opportunity and necessary supports to conduct the research. NC is grateful to IIT Kharagpur for a fellowship for this work. The author(s) received no financial support for the research, authorship, and/or publication of this article.

Funders	Funder number
Indian Institute of Technology, Kharagpur, India and Reliance Industries Ltd

Keywords

Rubber
mechanical properties
plastics
polypropylene
rheological properties
thermoplastic elastomer

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10.1177/00952443211051010

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abstract = "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.",

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AU - Chandel, Nishant

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AU - Saha, Subhabrata

AU - Bhowmick, Anil K.

AU - Gupta, Surendra

AU - Saroop, Madhumita

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AB - 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.

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

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