Insight into Degrading Effects of Two Fungi on Polyurethane Coating Failure in a Simulated Atmospheric Environment
Two different fungi, <i>Talaromyces funiculosus</i> (<i>T. funiculosus</i>) and <i>Phanerochaete chrysosporium</i> (<i>P. chrysosporium</i>), were collected from the Xishuangbanna atmospheric corrosion site and incubated on a polyurethane (PU) coating...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/15/2/328 |
| _version_ | 1797437592242749440 |
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| author | Xiangping Hao Kexin Yang Dawei Zhang Lin Lu |
| author_facet | Xiangping Hao Kexin Yang Dawei Zhang Lin Lu |
| author_sort | Xiangping Hao |
| collection | DOAJ |
| description | Two different fungi, <i>Talaromyces funiculosus</i> (<i>T. funiculosus</i>) and <i>Phanerochaete chrysosporium</i> (<i>P. chrysosporium</i>), were collected from the Xishuangbanna atmospheric corrosion site and incubated on a polyurethane (PU) coating at 30 °C for two weeks under 95% relative humidity (RH). The biodegrading effects of these fungi on the coating failure were investigated from aspects of metabolism and electrochemistry. The results showed that <i>T. funiculosus</i> contributed more to the degradation of the PU coating failure than <i>P. chrysosporium</i>, and two factors played dominant roles. First, the weight of the <i>T. funiculosus</i> mycelium was nearly 3 times more than that of <i>P. chrysosporium</i>, indicating there was more substrate mycelium of <i>T. funiculosus</i> deep into the coatings to get more nutrition in atmospheric during colonization. Second, <i>T. funiculosus</i> secreted carboxylic acids, such as citric, propanoic, succinic, and tartaric acids, and accelerated the hydrolysis of the ester and urethane bonds in the PU coatings. As a result, the mycelium of <i>T. funiculosus</i> readily penetrated the interface of the coating and substrate resulting in a rapid proliferation. Thus, the |Z|<sub>0.01Hz</sub> value of the coating decreased to 5.1 × 10<sup>4</sup> Ω·cm<sup>2</sup> after 14 days of colonization by <i>T. funiculosus</i> while the value remained at 7.2 × 10<sup>7</sup> Ω·cm<sup>2</sup> after colonization by <i>P. chrysosporium</i>. These insights suggest that the biodegradation process in simulated atmospheric environments would provide theoretical guidance and directions for the design of antifungal PU coatings. |
| first_indexed | 2024-03-09T11:24:40Z |
| format | Article |
| id | doaj.art-aef2599db4ee43e4a901240d143b4ccb |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T11:24:40Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-aef2599db4ee43e4a901240d143b4ccb2023-12-01T00:08:11ZengMDPI AGPolymers2073-43602023-01-0115232810.3390/polym15020328Insight into Degrading Effects of Two Fungi on Polyurethane Coating Failure in a Simulated Atmospheric EnvironmentXiangping Hao0Kexin Yang1Dawei Zhang2Lin Lu3National Materials Corrosion and Protection Data Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaNational Materials Corrosion and Protection Data Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaNational Materials Corrosion and Protection Data Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaNational Materials Corrosion and Protection Data Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaTwo different fungi, <i>Talaromyces funiculosus</i> (<i>T. funiculosus</i>) and <i>Phanerochaete chrysosporium</i> (<i>P. chrysosporium</i>), were collected from the Xishuangbanna atmospheric corrosion site and incubated on a polyurethane (PU) coating at 30 °C for two weeks under 95% relative humidity (RH). The biodegrading effects of these fungi on the coating failure were investigated from aspects of metabolism and electrochemistry. The results showed that <i>T. funiculosus</i> contributed more to the degradation of the PU coating failure than <i>P. chrysosporium</i>, and two factors played dominant roles. First, the weight of the <i>T. funiculosus</i> mycelium was nearly 3 times more than that of <i>P. chrysosporium</i>, indicating there was more substrate mycelium of <i>T. funiculosus</i> deep into the coatings to get more nutrition in atmospheric during colonization. Second, <i>T. funiculosus</i> secreted carboxylic acids, such as citric, propanoic, succinic, and tartaric acids, and accelerated the hydrolysis of the ester and urethane bonds in the PU coatings. As a result, the mycelium of <i>T. funiculosus</i> readily penetrated the interface of the coating and substrate resulting in a rapid proliferation. Thus, the |Z|<sub>0.01Hz</sub> value of the coating decreased to 5.1 × 10<sup>4</sup> Ω·cm<sup>2</sup> after 14 days of colonization by <i>T. funiculosus</i> while the value remained at 7.2 × 10<sup>7</sup> Ω·cm<sup>2</sup> after colonization by <i>P. chrysosporium</i>. These insights suggest that the biodegradation process in simulated atmospheric environments would provide theoretical guidance and directions for the design of antifungal PU coatings.https://www.mdpi.com/2073-4360/15/2/328<i>T. funiculosus</i><i>P. chrysosporium</i>polyurethane coatingpenetration of myceliabiodegradation |
| spellingShingle | Xiangping Hao Kexin Yang Dawei Zhang Lin Lu Insight into Degrading Effects of Two Fungi on Polyurethane Coating Failure in a Simulated Atmospheric Environment Polymers <i>T. funiculosus</i> <i>P. chrysosporium</i> polyurethane coating penetration of mycelia biodegradation |
| title | Insight into Degrading Effects of Two Fungi on Polyurethane Coating Failure in a Simulated Atmospheric Environment |
| title_full | Insight into Degrading Effects of Two Fungi on Polyurethane Coating Failure in a Simulated Atmospheric Environment |
| title_fullStr | Insight into Degrading Effects of Two Fungi on Polyurethane Coating Failure in a Simulated Atmospheric Environment |
| title_full_unstemmed | Insight into Degrading Effects of Two Fungi on Polyurethane Coating Failure in a Simulated Atmospheric Environment |
| title_short | Insight into Degrading Effects of Two Fungi on Polyurethane Coating Failure in a Simulated Atmospheric Environment |
| title_sort | insight into degrading effects of two fungi on polyurethane coating failure in a simulated atmospheric environment |
| topic | <i>T. funiculosus</i> <i>P. chrysosporium</i> polyurethane coating penetration of mycelia biodegradation |
| url | https://www.mdpi.com/2073-4360/15/2/328 |
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