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用于评估当代艺术中一种非常规丙烯酸蜡聚合物乳液稳定性的加速老化程序。

Accelerated Ageing Procedures to Assess the Stability of an Unconventional Acrylic-Wax Polymeric Emulsion for Contemporary Art.

作者信息

Izzo Francesca Caterina, Balliana Eleonora, Perra Emanuela, Zendri Elisabetta

机构信息

Sciences and Technologies for the Conservation of Cultural Heritage, Department of Environmental Sciences, Informatics and Statistics, Ca' Foscari University of Venice, Via Torino 155/b, 30172 Venice, Italy.

出版信息

Polymers (Basel). 2020 Aug 26;12(9):1925. doi: 10.3390/polym12091925.

DOI:10.3390/polym12091925
PMID:32858883
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7563966/
Abstract

This research evaluates the stability of an aqueous emulsion of acrylic copolymers and waxes. Edelwachs, generally applied on wood, has been recently used as an unconventional medium in contemporary painting. Through Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC-MS) and Fourier Transformed Infrared Attenuated Total Reflectance (FT-IR-ATR) analyses, the composition of Edelwachs was defined as a mixture of acrylic polymers (MA, MMA, nBA, nBMA), Carnauba and microcrystalline waxes and additives. Mock-ups-obtained mixing Edelwachs with titanium white, zinc white and ultramarine blue were subjected to UV, high temperatures, and high relative humidity accelerated ageing. The effect of the ageing procedures was evaluated through optical microscopy, colourimetric measurements, FT-IR-ATR, Thermogravimetry and Differential Scanning Calorimetry (TG-DSC) and wettability measures. FT-IR-ATR spectra do not show significant variations in terms of chemical stability, indicating a fair stability of Edelwachs as a painting binder. UV and high temperature treatments show the most relevant effects in terms of colorimetric changes (increasing of b*) and thermal stability. The TG-DSC highlights the influence of the pigments (specifically zinc white) mainly on the thermal behaviour of the acrylates. The unexpected decrease of wettability of the paint films, registered after ageing, may indicate a possible phase separation among acrylates and waxes.

摘要

本研究评估了丙烯酸共聚物与蜡的水性乳液的稳定性。Edelwachs通常用于木材，最近在当代绘画中被用作一种非常规媒介。通过热解-气相色谱-质谱联用（Py-GC-MS）和傅里叶变换红外衰减全反射（FT-IR-ATR）分析，Edelwachs的成分被确定为丙烯酸聚合物（MA、MMA、nBA、nBMA）、巴西棕榈蜡和微晶蜡以及添加剂的混合物。将Edelwachs与钛白、锌白和群青混合制成的模型，进行紫外线、高温和高相对湿度加速老化处理。通过光学显微镜、比色测量、FT-IR-ATR、热重分析和差示扫描量热法（TG-DSC）以及润湿性测量来评估老化过程的效果。FT-IR-ATR光谱在化学稳定性方面未显示出显著变化，表明Edelwachs作为绘画粘合剂具有相当的稳定性。紫外线和高温处理在比色变化（b*增加）和热稳定性方面显示出最显著的影响。TG-DSC突出了颜料（特别是锌白）主要对丙烯酸酯热行为的影响。老化后记录到的漆膜润湿性意外下降，可能表明丙烯酸酯和蜡之间可能发生了相分离。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/03ccddad3787/polymers-12-01925-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/614bb9699f81/polymers-12-01925-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/34a523483ce2/polymers-12-01925-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/7a3db3456a03/polymers-12-01925-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/96e29039387f/polymers-12-01925-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/f5a3cd885cd3/polymers-12-01925-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/41962984af33/polymers-12-01925-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/4d31a2344008/polymers-12-01925-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/4fac23716e42/polymers-12-01925-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/f96b56105eae/polymers-12-01925-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/03ccddad3787/polymers-12-01925-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/614bb9699f81/polymers-12-01925-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/34a523483ce2/polymers-12-01925-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/7a3db3456a03/polymers-12-01925-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/96e29039387f/polymers-12-01925-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/f5a3cd885cd3/polymers-12-01925-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/41962984af33/polymers-12-01925-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/4d31a2344008/polymers-12-01925-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/4fac23716e42/polymers-12-01925-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/f96b56105eae/polymers-12-01925-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a43/7563966/03ccddad3787/polymers-12-01925-g010.jpg

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