高等学校化学学报
高等學校化學學報
고등학교화학학보
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES
2001年
4期
700-702
,共3页
王武生%潘才元%曾俊%阮德礼%钟峰
王武生%潘纔元%曾俊%阮德禮%鐘峰
왕무생%반재원%증준%원덕례%종봉
纳米银粒子%聚氨酯微球%原位还原%银离子还原%银粒子聚集
納米銀粒子%聚氨酯微毬%原位還原%銀離子還原%銀粒子聚集
납미은입자%취안지미구%원위환원%은리자환원%은입자취집
Linear or cross-linked aqueous polyurethane dispersions with carboxyl Ag salt were prepared. TEM photos show that Ag+ was homogeneously distributed in the microspheres. The Ag+ was reduced in-situ by photochemical method. For linear polyurethane particles, as the extent of the reduction reaction of silver ions increased, the silver particles grew larger, but the number of the silver particles kept almost constant. In crosslinked polymer system, the number of silver particles increased, but the size of silver particles remained almost the same. We concluded that nucleation and growth of the silver particle are the result of the silver atom movement in the polymer matrix. In the linear polymer system, the movement of silver atom and aggregation of silver particles result in the formation and growth of several silver particles； in the cross-linked polymer system, the polymer chain prevents the movement of silver particles, resulting in a number increase of silver particles.
