MACROSCOPIC AND MICROSCOPIC THERMODYNAMIC OBSERVATIONS IN SWOLLEN POLY(VINYL ACETATE) NETWORKS
MACROSCOPIC AND MICROSCOPIC THERMODYNAMIC OBSERVATIONS IN SWOLLEN POLY(VINYL ACETATE) NETWORKS
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DOI：
10.1021/ma00010a040
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发表时间：
1991-05-13
期刊：
影响因子：
5.5
通讯作者：
RENNIE, AR
中科院分区：
文献类型：
--
作者：
HORKAY, F;HECHT, AM;RENNIE, AR
Thermodynamic and scattering properties of chemically cross-linked poly(vinyl acetate) (PVAc) networks swollen in toluene are investigated and compared with those of the corresponding un-cross-linked polymer solution. The swelling pressure data are described by a two-term equation consisting of a separable elastic and mixing contribution. The mixing term for the gel is smaller than for the solution, but both exhibit a similar concentration dependence. Thermodynamic information is obtained from small-angle neutron and X-ray scattering measurements for both the solution and the gel at different stages of dilution. The scattering signal of the gel is separated into a static and a solution-like part. The latter is compared with the swelling pressure of the gel obtained from the macroscopic osmotic measurements. The agreement found is generally satisfactory, although not perfect.
