Nurul Hidayat Aprilita

Nanosilica‐Chitosan Composite Coating on Cotton Fabrics

Nanosilica‐chitosan composite coating on cotton fabrics has been prepared by sol‐gel method. The sol‐gel procedure allows coating of material on nanometer scale, which several commonly used coating procedure cannot achieve. In addition, sol‐gel coating technique can be applied to system without disruption of their structure functionaly. The coating were produced via hidrolysis and condensation of TEOS and GPTMS and then mixed with chitosan. The composite coating on cotton fabrics were characterized with X‐Ray Diffraction and Scanning Electron microscopy (SEM) method. The result showed that the coating not changed or disrupted the cotton stucture. The coating result in a clear transparent thin layer on cotton surface. The nanocomposite coating has new applications in daily used materials, especially those with low heat resistance, such as textiles and plastics, and as an environmentally friendly water‐repellent substitute for fluorine compounds.

KAJIAN ANALISIS TERMAL KITIN-KITOSAN CANGKANG UDANG MENGGUNAKAN THERMOGRAVIMETRIC ANALYSIS DAN DIFFERENTIAL THERMAL ANALYSIS (TGA-DTA)

Telah dilakukan kajian analisis termal pada kitin-kitosan cangkang udang menggunakan thermogravimetric analysis dan differential thermal analysis (TGA-DTA). Kitosan dengan derajat deasetilasi (DD) bervariasi diperoleh dari proses deastilasi kitin dengan kondisi percobaan yang berbeda. Kitin dan kitosan dengan variasi DD tersebut dianalisis menggunakan TGA-DTA. Berdasarkan perbedaan termogram TGA-DTA kitin dan kitosan, menunjukkan bahwa kitosan lebih higroskopis daripada kitin dan memiliki gugus asetil yang lebih sedikit. Pada proses deasetilasi, kitin dimungkinkan terjadi degradasi rantai polimer dan pembentukan rantai polimer yang lebih panjang secara acak sehingga heterogenitas polimer kitosan lebih besar daripada kitin. Kata kunci: kitin-kitosan, analisis termal, termogram TGA/DTA