• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Surface cross-linked thermoplastic starch with different UV wavelengths: mechanical, wettability, hygroscopic and degradation properties
【24h】

Surface cross-linked thermoplastic starch with different UV wavelengths: mechanical, wettability, hygroscopic and degradation properties

机译：具有不同UV波长的表面交联热塑性淀粉：机械，润湿性，吸湿性和降解性能

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Here, we report a method to improve the properties of thermoplastic starch (TPS) by surface ultraviolet (UV) cross-linking. TPS sheets were prepared by injection molding and coated with an ethanol solution of photo-initiator TPO (2,4,6-trimethyl benzoyl diphenyl phosphine oxide), then, irradiated by UV with different wavelengths for 15 min. Untreated and irradiated TPS sheets were characterized using tensile and bending tests, impact tests, dynamic mechanical thermal analysis (DMTA) and infrared spectroscopy (FTIR). FTIR spectra showed that UV irradiation can effectively trigger surface cross-linking of TPS sheets. The mechanical and dynamic mechanical properties of the TPS were improved and the optimized properties were obtained by 308 nm UV irradiation. A tensile strength of 4.1 MPa, a bending strength of 2.7 MPa, an impact strength of 96.8 kJ m ~(?2) , and the corresponding activation energy of 251.22 kJ mol ~(?1) were obtained. The water contact angle and moisture absorption of the samples were also investigated and the 308 nm UV irradiated sheets have a contact angle of 74°. Moisture absorption rate as a function of the square root of time showed a sigmoid curve including a linear stage which conforms to Fick's second law. The samples irradiated by 308 nm UV had the lowest equilibrium moisture absorption rate M _(∞) and the longest time T _(0) to enter into the Fick's diffusion stage and the lowest slope K and diffusion coefficient D . All samples displayed biodegradable properties when buried in soil. This method has potential applications for agricultural mulch films, packing and medical film products.
机译：在这里，我们通过表面紫外线（UV）交联来报告改善热塑性淀粉（TPS）的性质的方法。通过注射成型制备TPS片，并涂覆光引发剂TPO（2,4,6-三甲基苯甲酸二苯基氧化膦）的乙醇溶液，然后通过紫外线照射，其具有不同波长15分钟。使用拉伸和弯曲试验，冲击试验，动态机械热分析（DMTA）和红外光谱（FTIR），表征未处理和辐照的TPS片。 FTIR光谱显示UV辐射可以有效地触发TPS片的表面交联。改善了TP的机械和动态力学性能，通过308nm辐照得到优化的性能。拉伸强度为4.1MPa，弯曲强度为2.7MPa，冲击强度为96.8kJ m〜（Δ2），并获得相应的活化能量为251.22kJ mol〜（α1）。还研究了样品的水接触角和吸湿性，并且308nm uV照射片具有74°的接触角。作为时间的平方根的函数的湿度吸收率显示了一种丝状曲线，包括符合Fick第二法律的线性阶段。通过308nm uV照射的样品具有最低的平衡湿度吸收率M _（∞）和最长的时间t_（0）进入Fick的扩散阶段和最低斜率k和扩散系数d。所有样品在埋在土壤中时显示可生物降解性质。该方法具有农产品膜，包装和医疗膜产品的潜在应用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号