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- 2018
TiO2对琼胶-κ-卡拉胶膜性能的影响
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Abstract:
采用热铸法，制备了琼胶膜、κ-卡拉胶膜及其两者的共混膜，并在共混膜中添加质量分数为0.8%的TiO2粉末，制得TiO2/琼胶-κ-卡拉胶复合膜。对这4种膜的SEM、XRD、力学性能、透光率、不透明度和对水的阻抗性进行测试。结果表明：琼胶-κ-卡拉胶膜的力学性能、透光率、不透明度和对水的阻抗性均介于琼胶膜和κ-卡拉胶膜之间，琼胶和κ-卡拉胶之间有良好的共混性，并且在共混膜中形成了分子间作用力。TiO2/琼胶-κ-卡拉胶复合膜的拉伸强度（45.44 MPa）比其他3种膜的拉伸强度都大，其中比琼胶-κ-卡拉胶膜的拉伸强度（31.06 MPa）提高46.30%，但断裂伸长率（15.73%）却比其他3种膜的都低，TiO2与复合膜基质分子间形成强相互作用力，增强复合膜的拉伸强度；在相同波长下，TiO2/琼胶-κ-卡拉胶复合膜的透光率比其他3种膜都低，在200~400 nm的紫外光区，TiO2/琼胶-κ-卡拉胶复合膜的透光率明显低于其他3种膜，添加TiO2的复合膜对紫外光有显著的屏蔽作用，但在600 nm波长处，不透明度（0.96）比其他3种膜都高；TiO2/琼胶-κ-卡拉胶复合膜对水的阻抗性高于琼胶-κ-卡拉胶膜。 Agar films, κ-carrageenan films and their blend films were prepared by thermal casting method, and 0.8%(0.8 g/100 g total dry matter) TiO2 powders were added into the blend films to obtain TiO2/agar-κ-carrageenan composite films. The four kinds films were tested by SEM, XRD, mechanical properties, light transmittance, opacity and resistance to water. The results show that the mechanical properties, light transmittance, opacity and resistance to water of agar-κ-carrageenan films are between agar films and κ-carrageenan films. Agar and κ-carrageenan have the good blending and the intermolecular forces are formed in the blend films. The tensile strength of TiO2/agar-κ-carrageenan composite films is 45.44 MPa which is higher than that of the other three films and increases 46.30% compared with the tensile strength (31.06 MPa) of agar-κ-carrageenan films. But the breaking elongation is 15.73% which is smaller than that of the other three films. The strong interaction forces are formed between matrix molecule of composite films and TiO2. So the tensile strength of the composite films is enhanced. At the same wavelength, the light transmittance of TiO2/agar-κ-carrageenan composite films is the lowest. In the ultraviolet region of 200-400 nm, the light transmittance of TiO2/agar-κ-carrageenan composite films is obviously lower than that of the other three films. TiO2/agar-κ-carrageenan composite films have a significant shielding effect on UV light. But at the 600 nm wavelength, the opacity of TiO2/agar-κ-carrageenan composite films is 0.96 which is the highest of the four films. The resistance to water of TiO2/agar-κ-carrageenan composite films is higher than agar-κ-carrageenan films. 国家自然科学基金（50803030）；博士后基金（201104581；20100471495）；长江学者和创新团队发展计划项目（IRT0970）
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