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Predicting the influence of edge oxidation in parallel-plate rheometry

Varun Venoor1*, Jo Ann Ratto2, David Kazmer1, Margaret Sobkowicz1

1 University of Massachusetts Lowell, Department of Plastic Engineering, Lowell, Massachusetts, USA

2 The Combat Capabilities Development Command Soldier Center, Natick, Massachusetts, USA

* Corresponding authors emails: Varun_Venoor@uml.edu
DOI10.24435/materialscloud:cb-xf [version v1]

Publication date: Jan 18, 2022

How to cite this record

Varun Venoor, Jo Ann Ratto, David Kazmer, Margaret Sobkowicz, Predicting the influence of edge oxidation in parallel-plate rheometry, Materials Cloud Archive 2022.8 (2022), doi: 10.24435/materialscloud:cb-xf.

Description

Melt post-condensation, thermal, and thermo-oxidative degradation of a cyclo-aliphatic polyamide were studied through time-resolved rheometry (TRR). The implemented TRR elucidates structural changes occurring during two concurrent phenomena, namely melt post-condensation and thermal/thermo-oxidative degradation, during the time sweep in a parallel plate rheometer. TRR measurements were conducted on neat polyamide under nitrogen (inert/non-oxidative) and air (oxidative) environment at 3 % strain amplitude and a range of frequencies between 0.1 and 100 rad/sec for two hours. At temperatures of 260, 270, and 275 °C, a dual-stage time-dependent growth in viscoelastic properties was observed under an oxidative environment. Thermo-oxidative degradation of polyamide melt 270 °C was shown to occur from the exposed sample edge, continuing inwards, effectively reducing the radius of the unoxidized polymer melt by 6.4 %. A modeling approach using MATLAB is presented to interpret and differentiate the rheological behavior of edge oxidized gel and bulk polymer within the volume of the sample melt. The code removes the effects of the strain limiter and the edge gelation from experimental measurements in predicting the material properties.

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Files

File name Size Description
Model_Torque_In_EdgeOxidation.m
MD5md5:7825c796f6cc696d161b7f52a9ecb9b1
3.4 KiB MATLAB code for predicting the viscoelastic properties of the bulk and the gel in an edge oxidized parallel-plate system.
TPA_270C_Dry_Air_10rad.csv
MD5md5:26113a09796aa69629dd622287fbeb44
59.5 KiB Time dependent experimental data for viscoelastic properties obtained from parallel plate rheometer. The file format is ".csv" which is read by the MATLAB ".m" file.

License

Files and data are licensed under the terms of the following license: Creative Commons Attribution 4.0 International.
Metadata, except for email addresses, are licensed under the Creative Commons Attribution Share-Alike 4.0 International license.

External references

Journal reference (The code and sample data presented in this archive is in reference to the article to be published in Rheologica Acta with the title "Analysis of post-condensation and thermo-oxidative degradation in cyclo-aliphatic polyamide through time-resolved rheology (TRR)".)
Venoor, V., Ratto, J.A, Kazmer, D.O., & Sobkowicz, M.J., Analysis of post-condensation and thermo-oxidative degradation in cyclo-aliphatic polyamide through time-resolved rheology (TRR). Rheol Acta (2022). "(Accepted)".

Keywords

Experimental MATLAB Edge Oxidation

Version history:

2022.8 (version v1) [This version] Jan 18, 2022 DOI10.24435/materialscloud:cb-xf