Abstract
In order to solve the problems of the poor binding capacity, forming the aggregate easily between the surface of calciumcarbonate powder and SF/PVA blend system, causing the dispersion inhomogeneous in the organic blending system.The CaCO3-filled SF/PVA blend films were prepared by blending solution with CaCO3 treated with titanate couplingagent. According to IR, the introduction of titanate coupling agent was indeed to crosslink the CaCO3 with PVA and SF.DSC showed that the compatibility of each component of blend films had obviously changed by adding of glycerin.When the content of calcium carbonate was 5wt%, the improving of the tensile strength, elongation at break mechanicalproperties and the stability of wet of blend films had obvious effect. In addition, when the content of titanate couplingagent was 0.3wt%, the blend films exhibited a breaking strength of 45.26Mpa and 832.78% elongation at break,dissolve-loss rates were 2.88%. After the content of titanate coupling agent increased, the mechanical propertiesdecreased and dissolve-loss rates increased gradually.
Highlights
Silk fibroin (SF), a water insoluble fibrous protein from Bombyx mori silkworm, has been mainly used as textile fibers with an excellent performance
The 3500-500cm-1 wave-number ranges of the FTIR spectra of CaCO3 fillers treated with titanate coupling agent was presented in Figure 1, respectively
A broad absorption band at about 1087.26cm-1 appeared in the treated sample, and was assigned to the P-O-C stretching peak of titanate coupling agent. All these facts indicated that the introduction of titanate coupling agent was to crosslink the CaCO3 with Poly(vinyl alcohol) (PVA) and SF
Summary
Silk fibroin (SF), a water insoluble fibrous protein from Bombyx mori silkworm, has been mainly used as textile fibers with an excellent performance. SF has been blended with other polymers in order to overcome the drawback of SF itself by improving mechanical properties and to introduce secondary performance The preparation and properties of polymer filled with nanometer inorganic rigid particles have become one of the hot points of research in this field (Zhen J et al, 2001, p5-8). Several researchers attempted to modify polymeric materials by filling with nanometer inorganic rigid particles, and discussed the dispersion property as well as its mechanisms, such as nano-calcium carbonate (Zhen J et al, 2001, p5-8), nano-SiO2 (Zheng YP et al, 2002, p1-3) and nano-Mg(OH) (Zhang Q et al, 2003, p88-95). 2010 characterized CaCO3-filled SF/PVA blend films prepared by adding glycerin and titanate coupling agent to improve the mechanical properties of SF/PVA. The stability of wet of blend films had obvious effect and determined the content of titanate coupling agent
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