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老化对用于考古遗址保护的高透明含氟聚合物力学性能的影响。

Effect of Aging on the Mechanical Properties of Highly Transparent Fluoropolymers for the Conservation of Archaeological Sites.

作者信息

Bracciale Maria Paola, Capasso Lorena, Sarasini Fabrizio, Tirillò Jacopo, Santarelli Maria Laura

机构信息

Department of Chemical Engineering Materials Environment (DICMA), University of Rome Sapienza, Via Eudossiana 18, 00184 Rome, Italy.

出版信息

Polymers (Basel). 2022 Feb 24;14(5):912. doi: 10.3390/polym14050912.

DOI:10.3390/polym14050912
PMID:35267735
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8912537/
Abstract

In recent years, fluoropolymers have found numerous applications in the architectural field because of their combination of mechanical-chemical resistance and high transparency. In the present work, commercial fluorinated polymers, such as perfluoro alkoxy (PFA) and ethylene tetrafluoroethylene copolymer (ETFE), have been evaluated for use as protective and transparent layers on monumental and archaeological sites (to preserve mosaics or frescoes) during the phases of restoration or maintenance outdoors. Considering this specific application, the present study was developed by evaluating the evolution of the mechanical (tensile, tear propagation resistance, and low-velocity impact tests) and chemical (FTIR and DSC analysis) properties of the films after accelerated UV aging. The results that were obtained demonstrated the high resistance capacity of the ETFE, which exhibits considerably higher elastic modulus and critical tear energy values than PFA films (1075.38 MPa and 131.70 N/mm for ETFE; 625.48 MPa and 59.06 N/mm for PFA). After aging, the samples exhibited only a slight reduction of about 5% in the elastic modulus for both polymers and 10% in the critical tear energy values for PFA. Furthermore, the differences in impact resistance after aging were limited for both polymers; however, the ETFE film showed higher peak force than the PFA films (82.95 N and 42.22 N, respectively). The results obtained demonstrated the high resistance capacity of ETFE films, making them the most suitable candidate for the considered application.

摘要

近年来，含氟聚合物因其兼具机械化学抗性和高透明度，在建筑领域得到了广泛应用。在本研究中，已对商用含氟聚合物，如全氟烷氧基（PFA）和乙烯-四氟乙烯共聚物（ETFE），进行了评估，以确定其在户外修复或维护阶段作为纪念性和考古遗址（用于保护马赛克或壁画）的防护和透明层的适用性。考虑到这一特定应用，本研究通过评估加速紫外线老化后薄膜的机械性能（拉伸、抗撕裂扩展和低速冲击试验）和化学性能（傅里叶变换红外光谱和差示扫描量热分析）的变化来开展。所获得的结果表明ETFE具有高抗性，其弹性模量和临界撕裂能值比PFA薄膜高得多（ETFE分别为1075.38 MPa和131.70 N/mm；PFA分别为625.48 MPa和59.06 N/mm）。老化后，两种聚合物的样品弹性模量仅略有下降，约为5%，PFA的临界撕裂能值下降了10%。此外，老化后两种聚合物的抗冲击性差异有限；然而，ETFE薄膜的峰值力比PFA薄膜高（分别为82.95 N和42.22 N）。所获得的结果表明ETFE薄膜具有高抗性，使其成为该应用最合适的候选材料。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f6b5/8912537/50081827448a/polymers-14-00912-g015.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f6b5/8912537/34a4d5f3e866/polymers-14-00912-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f6b5/8912537/01fb4a598ede/polymers-14-00912-g011.jpg
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本文引用的文献

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Heat-Resistant Polymer Composites Based on Ethylene Tetrafluoroethylene Mixed with Inorganic Polyoxides.基于乙烯四氟乙烯与无机多氧化物混合的耐热聚合物复合材料。
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