Effect of annealing on morphologies and performances of hydroxypropyl methylcellulose/hydroxypropyl starch blends,Journal of Applied Polymer Science

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Effect of annealing on morphologies and performances of hydroxypropyl methylcellulose/hydroxypropyl starch blends
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-07-21 , DOI: 10.1002/app.49535
Ying Chen ₁ , Lisha Liao ₁ , Hongsheng Liu _{1,

2} , Yanfei Wang ₃ , Liang Zhang ₄ , Ling Chen ₁ , Long Yu _{1,

2}

Affiliation

The morphologies and performances of the blends of hydroxypropyl methylcellulose (HPMC), which is a thermal gel, and hydroxypropyl starch (HPS), which is a cooling gel, provides a scientific model to understand the relationship between the microstructure and performance of the unique thermal/cooling gel system. The films based on these blends have been developed for various applications, such as food packaging and medicine capsules, mainly for improving processibility. The morphologies and performance of the blends strongly depend on annealing or storage conditions and time since they are neither miscible nor compatible. This work focuses on the effects of storage conditions and time on the morphologies and performance of the blend films. It was found that the morphologies of the blend system depend on temperature, moisture, and annealing time. Correspondently, the gas permeability and mechanical properties of the film were also environmentally and time dependent. When HPS is continuous phase, the annealing results in starch recrystallization, which increases rigidity. When HPMC is the continuous phase, the materials showed less moisture sensitivity. Starch recrystallization and phase separation, which resulted in microcracks on the surface of the films, are the main reasons for the reduction in gas barrier and elongation. This work will study these issues using scanning electron microscope, X‐ray diffraction, mechanical testing and establish their relationship.

中文翻译：

退火对羟丙基甲基纤维素/羟丙基淀粉共混物的形态和性能的影响

羟丙基甲基纤维素（HPMC）（一种导热凝胶）和羟丙基淀粉（HPS）（一种冷却凝胶）的共混物的形态和性能，为了解独特的导热胶的微观结构与性能之间的关系提供了科学模型/冷却凝胶系统。基于这些混合物的薄膜已被开发用于多种应用，例如食品包装和药品胶囊，主要是为了提高可加工性。共混物的形态和性能在很大程度上取决于退火或储存条件和时间，因为它们既不互溶也不相容。这项工作的重点是储存条件和时间对混合膜的形态和性能的影响。发现共混体系的形态取决于温度，湿度和退火时间。相应地，膜的透气性和机械性能也与环境和时间有关。当HPS为连续相时，退火会导致淀粉重结晶，从而增加刚度。当HPMC为连续相时，材料显示出较低的湿度敏感性。导致薄膜表面微裂纹的淀粉重结晶和相分离是气体阻隔性和伸长率降低的主要原因。这项工作将使用扫描电子显微镜，X射线衍射，机械测试研究这些问题并建立它们之间的关系。当HPMC为连续相时，材料显示出较低的湿度敏感性。导致薄膜表面微裂纹的淀粉重结晶和相分离是气体阻隔性和伸长率降低的主要原因。这项工作将使用扫描电子显微镜，X射线衍射，机械测试研究这些问题并建立它们之间的关系。当HPMC为连续相时，材料显示出较低的湿度敏感性。导致薄膜表面微裂纹的淀粉重结晶和相分离是气体阻隔性和伸长率降低的主要原因。这项工作将使用扫描电子显微镜，X射线衍射，机械测试研究这些问题并建立它们之间的关系。

更新日期：2020-09-13

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