Accounting for the moisture state of polymeric materials when developing machine learning models

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Abstract

The paper provides the results of studying the dependence of elastic-strength properties of unfilled epoxy polymers on moisture content by example of 18 different compounds. It includes the analysis of possible effects associated with changes in free moisture content in the polymer matrix structure, including a change in nature of behavior under load from brittle to viscous with a multiple increase in relative deformations at rupture, as well as quasi-embrittlement, manifested in the elimination or reduction of forced highly elastic deformations on the deformation curve. In addition to the shape corresponding to the one close to linear dependence of the change in tensile strength and modulus of elasticity on moisture content with a maximum around W~0%, the study revealed other forms of interrelation of parameters under consideration: with a local maximum of values in the “optimal moisture content” area differing from W~0%; with “plateau” sections around both extreme humidity conditions. The similarity of the effects occurring around moisture content of W~0% for epoxy polymer samples both in the control state and after prolonged climatic aging is shown. A hypothesis was formulated regarding the existence of a pattern common to epoxy polymers of change in the nature of the dependence of mechanical strength on moisture content during field climatic aging. Based on a joint analysis of the dependence curves of elastic-strength parameters on moisture content, the most representative epoxy polymer compounds for field studies were selected to compile training datasets for a machine learning model predicting changes in the elastic-strength properties of polymer materials exposed to environmental factors.

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About the authors

D. R. Nizin

National Research Ogarev Mordovia State University; Scientific-Research Institute of Building Physics of the Russian Academy architecture and construction sciences

Author for correspondence.
Email: nizindi@yandex.ru

Candidate of Sciences (Engineering)

Russian Federation, 68, Bolshevistskaya Street, Saransk, 430005, Republic of Mordovia; 21, Lokomotivniy Driveway, Moscow,127238

T. A. Nizina

National Research Ogarev Mordovia State University; Scientific-Research Institute of Building Physics of the Russian Academy architecture and construction sciences

Email: nizinata@yandex.ru

Doctor of Sciences (Engineering) 

Russian Federation, 68, Bolshevistskaya Street, Saransk, 430005, Republic of Mordovia; 21, Lokomotivniy Driveway, Moscow,127238

V. P. Selyaev

National Research Ogarev Mordovia State University; Scientific-Research Institute of Building Physics of the Russian Academy architecture and construction sciences

Email: ntorm80@mail.ru

Doctor of Sciences (Engineering) 

Russian Federation, 68, Bolshevistskaya Street, Saransk, 430005, Republic of Mordovia; 21, Lokomotivniy Driveway, Moscow,127238

I. P. Spirin

National Research Ogarev Mordovia State University; Scientific-Research Institute of Building Physics of the Russian Academy architecture and construction sciences

Email: spirinil2000@yandex.ru

Engineer 

Russian Federation, 68, Bolshevistskaya Street, Saransk, 430005, Republic of Mordovia; 21, Lokomotivniy Driveway, Moscow,127238

References

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Supplementary files

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2. Fig. 1. The levels of maximum moisture content of the samples (arithmetic mean values) of the studied epoxy polymer compositions

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3. Fig. 2. The moisture content influence on the deformation curves of the epoxy polymer Etal-247/Etal-1440N under tension

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4. Fig. 3. The moisture content influence on the deformation curves of the epoxy polymer Etal-370/Etal-1440N under tension

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5. Fig. 4. The moisture content influence on the deformation curves of the epoxy polymer ED-20/Etal-1440N under tension

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6. Fig. 5. The moisture content influence on the deformation curves of the epoxy polymer Etal-247/Etal-M7 under tension

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7. Fig. 6. Changes in the tensile strength limit (a, c) and relative elongation during stretching (b, d) of series samples of epoxy resin-based polymers Etal-247, cured with Etal-1472 (a, b) and Etal-45M (c, d), during natural exposure in moderately continental climate conditions (taking into account moisture content) [19]

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8. Fig. 7. The variation in tensile strength values of epoxy polymers depending on moisture content

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9. Fig. 8. The variation in relative elongation values of epoxy polymers at maximum load depending on moisture content

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10. Fig. 9. Variation in tensile modulus values of epoxy polymers depending on moisture content

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11. Fig. 10. Change in tensile strength of epoxy polymer samples cured with Etal-45M depending on their moisture content

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12. Fig. 11. Change in tensile strength of epoxy polymer samples cured with Etal-1460 depending on their moisture content

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13. Fig. 12. Change in tensile strength of epoxy polymer samples cured with Etal-1440H depending on their moisture content

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14. Fig. 13. Change in tensile strength of epoxy polymer samples cured with Etal-2MK depending on their moisture content

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15. Fig. 14. Change in tensile strength of epoxy polymer samples cured with Etal-M7 depending on their moisture content

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16. Fig. 15. Change in tensile strength of epoxy polymer samples cured with PEPA depending on their moisture content

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