摘要
利用冷冻-解冻法制备了聚乙烯醇/膨润土杂化水凝胶.X射线衍射结果表明,膨润土以剥离形式分布在水凝胶基体中.研究结果表明,与纯PVA5水凝胶相比,经过5个冷冻-解冻循环制备的含2%(ω)膨润土的杂化水凝胶的拉伸模量、拉伸强度和断裂伸长率分别增加了44.0%,74.2%和25.2%,而溶胀行为与5个循环的纯水凝胶相近.含0.5%(ω)膨润土的杂化水凝胶的拉伸模量和拉伸强度高于基体水凝胶,其在溶胀400min时的溶胀度高于所有的样品.
Bentonite was added into PVA hydrogels to modify the mechanical properties. A series of PVA/bentonite hybrid hydrogels were prepared by freezing/thawing method. For comparison, the PVA hydrogels by different numbers of cycles and with different loadings of bentonite were prepared. X-ray diffraction results show that the exfoliated structure exists in the hybrid hydrogels. For the PVA/bentonite （2.0%, 09） hybrid hydrogel by 5 cycles, compared with the pure PVA hydrogels by 5 cycles （PVA5）, the tensile modulus, tensile strength and strain at break are increased by 44.0%, 74.2% and 25.2%. Its swelling behavior is similar to that of PVA5. The tensile strength and strain at break of PVA/bentonite （0.5%, ω） hydrogel by 5 cycles are higher than those of PVA5. Its final swelling ratio at 400 min is the biggest in all specimens.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2006年第3期503-506,共4页
The Chinese Journal of Process Engineering
关键词
水凝胶
膨润土
溶胀行为
力学性能
hydrogels
bentonites
swelling
mechanical properties
