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Titolo:
Comparison of the effects of acetoxy and hydroxy groups on the water uptake into the cured epoxy resin
Autore:
Li, SJ; Zhang, SY; Luo, XW; Ding, YF; Zhou, WF;
Indirizzi:
Fudan Univ, Dept Macromol Sci, Key Lab Mol Engn Polymers, State Educ Minist, Shanghai 200433, Peoples R China Fudan Univ Shanghai Peoples R China 200433 nghai 200433, Peoples R China Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China Fudan Univ Shanghai Peoples R China 200433 nghai 200433, Peoples R China
Titolo Testata:
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
fascicolo: 5, volume: 21, anno: 2000,
pagine: 813 - 815
SICI:
0251-0790(200005)21:5<813:COTEOA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
CHI
Keywords:
epoxy resin; epoxy coating; water absorption;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
8
Recensione:
Indirizzi per estratti:
Indirizzo: Li, SJ Fudan Univ, Dept Macromol Sci, Key Lab Mol Engn Polymers, State Educ Minist, Shanghai 200433, Peoples R China Fudan Univ Shanghai Peoples R China 200433 00433, Peoples R China
Citazione:
S.J. Li et al., "Comparison of the effects of acetoxy and hydroxy groups on the water uptake into the cured epoxy resin", CHEM J CH U, 21(5), 2000, pp. 813-815

Abstract

A comparison of the effects of acetoxy and hydroxy groups on the water uptake into the cured epoxy resin was made using the gravimetric method, DSC and corrosion test. The experimental results show that the replacing of the hydroxy groups with acetoxy groups in the resin causes less water uptake, but increases the diffusibility of water in the resin. For example, at 30 degrees C, the equilibrium water sorption of the o-cresol novolac epoxy resincured with phenol novolac acetate resin(EPA) is 0. 84% (mass fraction), while the epoxy resin cured with phenol novolac resin(EP) is 1. 97%; the activation energies for diffusion of water in EPA and EP are 40 and 48 kJ . mol(-1) respectively. The effects may be mainly due to the hydrophobic methyl group of the acetoxy groups. The methyl group prevents the uptake of water,but makes the acetoxy group more flexible, which causes water diffusion less difficult. Moreover, the results show that the unique structure of the interphase of the EPA coating/Al substrate even causes further less water uptake, and improves the effectiveness of corrosion protection for the coating accordingly.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 08:54:45