Preparation of cotton linter nanowhiskers by high-pressure homogenization process and its application in thermoplastic starch
Preparation of cotton linter nanowhiskers by high-pressure homogenization process and its application in thermoplastic starch
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DOI：
10.1007/s13204-014-0316-3
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发表时间：
2015-03
影响因子：
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通讯作者：
N. Savadekar;V. Karande;N. Vigneshwaran;P. Kadam;S. Mhaske
中科院分区：
文献类型：
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作者：
N. Savadekar;V. Karande;N. Vigneshwaran;P. Kadam;S. Mhaske
本文研究了用酸水解法制备棉绒纳米晶须，并在高压均质机中进行后续处理。将制备好的CLNW作为热塑性淀粉（TPS）的增强材料，以改善其性能。CLNW在TPS中的浓度分别为0、1、2、3、4和5 wt%。采用溶液浇铸法制备了TPS/CLNW纳米复合薄膜。通过拉伸、差示扫描量热法、扫描电镜（SEM）、水蒸气渗透性（WVP）、氧渗透性（OP）、x射线衍射和透光性对纳米复合膜进行了表征。3 wt% clnw负载的TPS纳米复合膜与原始TPS聚合物膜相比，拉伸强度提高了88%；WVP和OP分别降低了90%和92%，与添加CLNW相比，这是非常可观的。与原始TPS相比，纳米复合膜的DSC热图对熔化温度没有明显影响。TPS的透光率（Tr）值随着CLNW含量的增加而降低。由于两种材料的亲水性，CLNW和TPS之间的相互作用更好，并且CLNW在TPS中的均匀分布是CLNW在TPS中加载3 wt%时性能改善的主要原因。然而，从SEM分析可以看出，CLNW在较高浓度下形成了团块。这些纳米复合薄膜在食品和药品包装方面具有潜在的用途。
The present work deals with the preparation of cotton linter nanowhiskers (CLNW) by acid hydrolysis and subsequent processing in a high-pressure homogenizer. Prepared CLNW were then used as a reinforcing material in thermoplastic starch (TPS), with an aim to improve its performance properties. Concentration of CLNW was varied as 0, 1, 2, 3, 4 and 5 wt% in TPS. TPS/CLNW nanocomposite films were prepared by solution-casting process. The nanocomposite films were characterized by tensile, differential scanning calorimetry, scanning electron microscopy (SEM), water vapor permeability (WVP), oxygen permeability (OP), X-ray diffraction and light transmittance properties. 3 wt% CLNW-loaded TPS nanocomposite films demonstrated 88 % improvement in the tensile strength as compared to the pristine TPS polymer film; whereas, WVP and OP decreased by 90 and 92 %, respectively, which is highly appreciable compared to the quantity of CLNW added. DSC thermograms of nanocomposite films did not show any significant effect on melting temperature as compared to the pristine TPS. Light transmittance (Tr) value of TPS decreased with increased content of CLNW. Better interaction between CLNW and TPS, caused due to the hydrophilic nature of both the materials, and uniform distribution of CLNW in TPS were the prime reason for the improvement in properties observed at 3 wt% loading of CLNW in TPS. However, CLNW was seen to have formed agglomerates at higher concentration as determined from SEM analysis. These nanocomposite films can have potential use in food and pharmaceutical packaging applications.