Е-Публикации
Технически университет - София

Abstract: All right reserved.This study investigates the effects of artificial thermal aging on the mechanical properties of 30% glass fiber-reinforced Polyamide 11 (PA11-GF30). Tensile and compression tests were conducted on specimens aged at 125°C, 150°C, and 175°C for up to 4152 hours. The results indicate a progressive decline in mechanical properties, with tensile strength decreasing from an initial 104.6 MPa to 92.63 MPa (12.4% reduction) at 125°C, 73.96 MPa (34.3% reduction) at 150°C, and 74.36 MPa (33.8% reduction) at 175°C. Similarly, compressive strength declined from 135.59 MPa to 122.81 MPa (9.4% reduction) at 125°C, 124.28 MPa (8.3% reduction) at 150°C, and 104.76 MPa (22.7% reduction) at 175°C. Notably, an initial strengthening phase was observed due to post-crystallization, particularly at lower temperatures. Elongation at break exhibited a sharp decline, confirming the transition from ductile to brittle behavior, with samples at 150°C and 175°C reaching the 5% brittleness threshold after 2016 hours and 1344 hours, respectively. These findings provide critical insights for the design and application of PA11-GF30 in high-temperature environments, supporting its use in automotive, aerospace, and industrial sectors requiring durable polymer-based components.

References

1. [1] J.M. Raquez, et al. (2010) Thermal Ageing of Polyamide-11 Based Composites. Polymer Degradation and Stability 95(11) 2140-2148.
2. [2] C. Ocampo-Martinez, et al. (2017) Effects of Thermal Aging on the Structure and Mechanical Properties of Polyamide 11. Journal of Applied Polymer Science 134(19) 44767.
3. [3] M.S. Oliveira, et al. (2020) Biobased Polyamides: Recent Advances in Basic and Applied Research. Macromolecules 53(10) 3835-3857.
4. [4] CAMPUS by Uniform Standards. Computer Aided Material Preselection. Available at: www.campusplastics.com.
5. [5] Arkema. Rilsan®Polyamide 11 Brochure. Available at: https://hpp.arkema.com/en/product-families/rilsan-polyamide-11-resins/.
6. [6] L.P. Sung, et al. (2018) Accelerated Aging of Polyamide 11: The Effects of Environmental Stressors and Additives. Polymer Degradation and Stability 152 52-63.
7. [7] N.B. Georgiev (2021) Design of Injection Mold Used for Manufacturing of Multipurpose Test Specimens of Thermoplastic Materials. Bulgarian Journal of Engineering Design Issue 44, Bulgaria, Sofia.
8. [8] IEC 60216-1 (2013) Electrical Insulating Materials 一 Thermal Endurance Properties -Part 1: Ageing Procedures and Evaluation of Test Results. International Electrotechnical Commission, Geneva, Switzerland.
9. [9] ISO 527- 1 (2019) Plastics - Determination of Tensile Properties - Part 1: General Principles. International Organization for Standardization.
10. [10] V.S. Chevali, D.R. Dean, G.M. Janowski (2010) Effect of Environmental Weathering on Flexural Creep Behavior of Long Fiber-Reinforced Thermoplastic Composites. Polymer Degradation and Stability 95 2628-2640.
11. [11] I. KSOURI, O. DE ALMEIDA, N. HADDAR (2017) Long-Term Ageing of Polyamide 6 and Polyamide 6 Reinforced with 30% of Glass Fibers: Physicochemical, Mechanical, and Morphological Characterization. Journal of Polymer Research 24 133.
12. [12] S. RUDZIŃSKI, L. HÄUSSLER, C. HARNISCH, E. MÄDER, G. HEINRICH (2011) Glass Fibre Reinforced Polyamide Composites: Thermal Behaviour of Sizings. Composites: Part A 42 157-164.
13. [13] R. Li, X. Hu (1998) Study on Discoloration Mechanism of Polyamide 6 During Thermo-Oxidative Degradation. Polymer Degradation and Stability 62 523-528.
14. [14] G.L. Wilkes, J.W. Summers, C.Ä. Daniels (2005) Infrared Spectroscopy in the Study of Polymeric Materials: Äpplications in Äging Änalysis. Polymer Analysis and Characterization 8(2) 123-145.

Issue