Diffusion and hydrolysis effects during water aging on an epoxyanhydride system

被引：56
作者：
Capiel, Guillermina [1 ,2 ]
Uicich, Julieta [1 ,2 ]
Fasce, Diana [2 ,3 ]
Montemartini, Pablo E. [1 ,2 ,4 ]
机构：
[1] UNMdP, Struct Composites Grp, Inst Mat Sci & Technol INTEMA, RA-7575 Mar Del Plata, Buenos Aires, Argentina
[2] Natl Res Council CONICET, RA-7575 Mar Del Plata, Buenos Aires, Argentina
[3] UNMdP, Polymer Characterizat Lab, Inst Mat Sci & Technol INTEMA, RA-7575 Mar Del Plata, Buenos Aires, Argentina
[4] UNMdP, Chem Engn Dept, RA-9302 Mar Del Plata, Buenos Aires, Argentina
来源：
POLYMER DEGRADATION AND STABILITY | 2018年 / 153卷
关键词：
Hydrothermal aging; Water absorption; Hydrolysis; Epoxy-anhydride networks; EPOXY-RESIN; ABSORPTION CHARACTERISTICS; SORPTION CHARACTERISTICS; COMPOSITES; SPECTROSCOPY; TEMPERATURE; NETWORKS; MOISTURE; BEHAVIOR; MATRIX;
D O I：
10.1016/j.polymdegradstab.2018.04.030
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Hydrothermal aging of an epoxy-anhydride network has been studied by means of gravimetric analysis, Fourier transform infrared spectroscopy (FTIR) and modulated differential scanning calorimetry (MDSC). The long-term aging results revealed a fourth stage mechanism in which an initial short diffusional period is followed by the hydrolysis of the ester groups. Degraded materials showed two values of glass transition temperature suggesting a heterogeneous process. Hydrolysis undergoes in preferential sites due to the catalytic effect of the carboxyl acids formed during the chemical degradation. Domains with low crosslinking density and high mobility are formed. At long degradation time, samples presented a unique glass transition temperature around 50 degrees C. The lixiviation of low molecular weight species formed by the hydrolytic scissions was confirmed by FTIR and pH variations. (C) 2018 Elsevier Ltd. All rights reserved.
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收藏
页码：165 / 171
页数：7
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