Study of the structural changes in urea-formaldehyde condensates during synthesis

被引：25

作者：

Siimer, K ^{[1
]}

Pehk, T ^{[1
]}

Christjanson, P ^{[1
]}

机构：

[1] Tallinn Univ Technol, Dept Polymer Mat, EE-19086 Tallinn, Estonia

来源：

MACROMOLECULAR SYMPOSIA | 1999年 / 148卷

关键词：

D O I：

10.1002/masy.19991480113

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Chemical constitution of urea-formaldehyde resins in synthesis and in storage was determined using C-13 NMR spectroscopy. Methylolation, methylene and dimethylene ether bond-forming reactions were discussed. The changes in the content of structural elements with secondary and tertiary amino groups of urea at various stages were followed. The resin synthesis technology was used, which considers the requirement in low free formaldehyde content, connected with somewhat smaller storage stability of resins.

引用

页码：149 / 156

页数：8

共 16 条

[1] C-13 CP/MAS NMR-STUDY OF THE STRUCTURAL DEPENDENCE OF UREA FORMALDEHYDE RESINS ON FORMALDEHYDE-TO-UREA MOLAR RATIOS AT DIFFERENT UREA CONCENTRATIONS AND PH VALUES [J].

CHUANG, IS ;

MACIEL, GE .

MACROMOLECULES, 1992, 25 (12) :3204-3226

[2] Urea-formaldehyde (UF) adhesive resins for wood [J].

Dunky, M .

INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES, 1998, 18 (02) :95-107

[3] CHARACTERIZATION OF UREA-FORMALDEHYDE ADDUCTS AND RESINS BY C-13-NMR SPECTROSCOPY [J].

EBDON, JR ;

HEATON, PE .

POLYMER, 1977, 18 (09) :971-974

[4] C-13 NMR ANALYSIS METHOD FOR UREA-FORMALDEHYDE RESIN STRENGTH AND FORMALDEHYDE EMISSION [J].

FERG, EE ;

PIZZI, A ;

LEVENDIS, DC .

JOURNAL OF APPLIED POLYMER SCIENCE, 1993, 50 (05) :907-915

[5]

Gu JY, 1996, MOKUZAI GAKKAISHI, V42, P149

[6]

Gu JY, 1996, MOKUZAI GAKKAISHI, V42, P992

[7]

Gu JY, 1996, MOKUZAI GAKKAISHI, V42, P483

[8]

Gu JY, 1995, MOKUZAI GAKKAISHI, V41, P1115

[9] EFFECTS OF REACTION PH ON PROPERTIES AND PERFORMANCE OF UREA-FORMALDEHYDE RESINS [J].

HSE, CY ;

XIA, ZH ;

TOMITA, B .

HOLZFORSCHUNG, 1994, 48 (06) :527-532

[10] Resistance of cured urea-formaldehyde resins to hydrolysis: A method of evaluation [J].

Kavvouras, PK ;

Koniditsiotis, D ;

Petinarakis, J .

HOLZFORSCHUNG, 1998, 52 (01) :105-110

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