水合作用对丝膜材料性能的影响。
Effect of hydration on silk film material properties.
机构信息
Department of Biomedical Engineering, Cornell University, 101 Weill Hall, Ithaca, NY 14853, USA.
出版信息
Macromol Biosci. 2010 Apr 8;10(4):393-403. doi: 10.1002/mabi.200900294.
Abstract
Effects of hydration on silk fibroin film properties were investigated for water-annealed and MeOH-treated samples. Hydration increased thickness by 60% for MeOH-immersed films, while water-annealed samples remained constant. MeOH-immersed films showed an 80% mass loss due to water, while water-annealed lost only 40%. O(2) permeability was higher in MeOH-immersed films with Dk values of 10(-10) (mL O(2) x cm) x (cm(-1) x s(-1) x mmHg(-1)), while those of water-annealed films reached only one fifth of this value. All films showed a decrease in Young's modulus and increased plastic deformation by two orders of magnitude when submerged in saline solution. FT-IR showed that beta-sheet content in water-annealed films increased with increasing water vapor pressure, while MeOH-immersed films showed no change.
摘要
研究了水合作用对丝素蛋白膜性能的影响，分别对水退火和甲醇处理的样品进行了研究。水合作用使甲醇浸泡的薄膜厚度增加了 60%，而水退火的样品则保持不变。甲醇浸泡的薄膜因水而损失了 80%的质量，而水退火的薄膜仅损失了 40%。甲醇浸泡的薄膜的 O(2)透过率较高，Dk 值为 10(-10)（mL O(2) x cm) x (cm(-1) x s(-1) x mmHg(-1))，而水退火的薄膜的 Dk 值仅为其五分之一。所有薄膜在盐溶液中浸泡时，杨氏模量降低，塑性变形增加两个数量级。傅里叶变换红外光谱（FT-IR）表明，水退火的薄膜中β-折叠含量随水蒸气压力的增加而增加，而甲醇浸泡的薄膜则没有变化。
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