| 摘要: |
| 主要研究目标是开发以天然抗氧化剂生育酚为模型的控制释放包装材料以增进食品安全.特别是研究添加生育酚对包装聚合物的物理特性的影响.采用工业级挤压机成功制备了3种包含3 000 mg/kg天然生育酚的控制释放聚合物:聚乙烯,聚丙烯和以上两者的混合物(50/50).具体研究了以上材料的物理性质(熔点,结晶点和玻璃化相变温度等）以及生育酚的制备回收率.研究结果证明:聚乙烯和聚丙烯在高温挤压条件下未发生相互反应,可以作为制备混合聚合物的良好材料.添加生育酚对聚合物材料的机械强度有显著影响.生育酚的制备回收率在3种材料中均高于90%.以上结果说明工业制备控制释放生育酚包装材料确实可行.研究结果对于研究开发保障食品安全的控制释放包装材料有重要的指导意义. |
| 关键词: 聚乙烯 聚丙烯 生育酚 物理特性 |
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| Effect of tocopherols incorporation on physical properties of LDPE,PP and blend film of LDPE/PP |
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ZHU Xuntao1, WEI Xinlin2, SHEN Luni3
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1.Department of Food Science,Nutrition and Management,Delaware Valley University;2.College of Life and Environmental Sciences,Shanghai Normal University;3.Department of Food Science,Rutgers University
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| Abstract: |
| The objectives of this study were to investigate the effects of added tocopherols and blending of different polymers on the film physical properties.Tocopherols (3 000 mg/kg) were incorporate into low density polyethylene (LDPE),polypropylene (PP) and a blend film of LDPE/PP (50/50) by extrusion process.Then films were evaluated to determine tocopherol recovery and physical properties.Results showed that extrusion did not significantly change film thermal properties (Tm,Tc and Tg) as compared with synthetic polymer resin pellet (raw material).LDPE and PP did not seem to react with each other to form new polymers under the current extrusion conditions.Addition of tocopherol significantly changed film mechanical properties compared with control.The above results and other data seemed to support that polymer blending is a feasible approach for producing tocopherol containing packaging films. |
| Key words: polyethylene polypropylene tocopherols physical properties |
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