Melt fracture of polyisobutylenes

Emmanouil Chatzigiannakis; Marzieh Ebrahimi; Manfred H. Wagner; Savvas G. Hatzikiriakos

doi:10.1016/j.polymertesting.2017.02.028

Melt fracture of polyisobutylenes

Emmanouil Chatzigiannakis, Marzieh Ebrahimi, Manfred H. Wagner, Savvas G. Hatzikiriakos

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

5 Citations (Scopus)

Abstract

The processability of different grades of polyisobutylene (PIB) was investigated using a capillary rheometer. Direct focus was given to the occurrence of melt fracture phenomena, such as sharkskin and gross melt fracture (GMF). The influence of molecular weight (MW) of PIB, temperature and die entrance angle on melt fracture was examined in detail. Due to their highly elastic nature, high MW PIBs were found to exhibit gross melt fracture instability even at low shear rates, rendering their processing an impossible task. An increase in temperature resulted in postponing both instabilities (sharkskin and gross) to higher shear rates, thus making their processing easier. Finally, decreasing the entrance angle below a critical value resulted in postponing the onset of GMF to higher shear rates.

Original language	English
Pages (from-to)	30-38
Number of pages	9
Journal	Polymer Testing
Volume	60
DOIs	https://doi.org/10.1016/j.polymertesting.2017.02.028
Publication status	Published - 1 Jul 2017
Externally published	Yes

Keywords

Capillary extrusion
Gross melt fracture
Polyisobutylene
Sharkskin

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10.1016/j.polymertesting.2017.02.028

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title = "Melt fracture of polyisobutylenes",

abstract = "The processability of different grades of polyisobutylene (PIB) was investigated using a capillary rheometer. Direct focus was given to the occurrence of melt fracture phenomena, such as sharkskin and gross melt fracture (GMF). The influence of molecular weight (MW) of PIB, temperature and die entrance angle on melt fracture was examined in detail. Due to their highly elastic nature, high MW PIBs were found to exhibit gross melt fracture instability even at low shear rates, rendering their processing an impossible task. An increase in temperature resulted in postponing both instabilities (sharkskin and gross) to higher shear rates, thus making their processing easier. Finally, decreasing the entrance angle below a critical value resulted in postponing the onset of GMF to higher shear rates.",

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T1 - Melt fracture of polyisobutylenes

AU - Chatzigiannakis, Emmanouil

AU - Ebrahimi, Marzieh

AU - Wagner, Manfred H.

AU - Hatzikiriakos, Savvas G.

PY - 2017/7/1

Y1 - 2017/7/1

N2 - The processability of different grades of polyisobutylene (PIB) was investigated using a capillary rheometer. Direct focus was given to the occurrence of melt fracture phenomena, such as sharkskin and gross melt fracture (GMF). The influence of molecular weight (MW) of PIB, temperature and die entrance angle on melt fracture was examined in detail. Due to their highly elastic nature, high MW PIBs were found to exhibit gross melt fracture instability even at low shear rates, rendering their processing an impossible task. An increase in temperature resulted in postponing both instabilities (sharkskin and gross) to higher shear rates, thus making their processing easier. Finally, decreasing the entrance angle below a critical value resulted in postponing the onset of GMF to higher shear rates.

AB - The processability of different grades of polyisobutylene (PIB) was investigated using a capillary rheometer. Direct focus was given to the occurrence of melt fracture phenomena, such as sharkskin and gross melt fracture (GMF). The influence of molecular weight (MW) of PIB, temperature and die entrance angle on melt fracture was examined in detail. Due to their highly elastic nature, high MW PIBs were found to exhibit gross melt fracture instability even at low shear rates, rendering their processing an impossible task. An increase in temperature resulted in postponing both instabilities (sharkskin and gross) to higher shear rates, thus making their processing easier. Finally, decreasing the entrance angle below a critical value resulted in postponing the onset of GMF to higher shear rates.

KW - Capillary extrusion

KW - Gross melt fracture

KW - Polyisobutylene

KW - Sharkskin

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DO - 10.1016/j.polymertesting.2017.02.028

M3 - Article

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SN - 0142-9418

VL - 60

SP - 30

EP - 38

JO - Polymer Testing

JF - Polymer Testing

ER -

Melt fracture of polyisobutylenes

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Keywords

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