Role of the excess monomer in the growth of urea and formaldehyde resin deposit particles

被引：8

作者：

Hao, Zhixian ^{[1
]}

Guo, Yuqing ^{[1
]}

Mansuer, Mulati ^{[1
]}

Zhu, Junfu ^{[1
]}

Zhu, Zhirong ^{[1
]}

机构：

[1] Tongji Univ, Dept Chem, Shanghai 200092, Peoples R China

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2014年 / 430卷

关键词：

UF resin microsphere; Excess monomer; Lamellar crystallinity; Nucleation reaction; Water absorption; INDUCED COLLOID AGGREGATION; TITANIA; ZIRCONIA; SPHERES; SILICA; ADHESIVES; CRYSTALLINITY; PRECIPITATION; MICROSPHERES; RETENTION;

D O I：

10.1016/j.jcis.2014.05.044

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The role of excess monomer (i.e., Urea (U) or Formaldehyde (F)) in UF precipitation reaction was investigated at 28 C. The maximum output of the UF resin deposit was found around the U:F molar ratio 1.0:1.0 and this output decreased if excessive urea (or formaldehyde) was used in the reaction system. The excess monomer was considered to decrease the polymerization degree of UF resin deposit and increased the bonding saturation of its copolymerization monomer as well as the solubility of the UF resin deposit. The Influence of the excess monomer on the lamellar crystallinity of the resultant deposit, involving the polymerization degree and bonding saturation of the monomer, was examined. Three different dynamic regions containing excess monomers were revealed according to the behaviors of the deposit nucleation. The density and water absorption of the UF resin particles were finally demonstrated relative to the dynamic regions in their nucleation reactions. (C) 2014 Elsevier Inc. All rights reserved.

引用

页码：239 / 248

页数：10

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