Simge ÖZKAYALAR, SENNUR ALAY AKSOY, M. Selda TÖZÜM, Cemil ALKAN

TEKSTİL UYGULAMALARI İÇİN FLUORAN BOYALAR İÇEREN TERMOKROMİK SİSTEMLERİN POLİ(METİL METAKRİLAT) DUVAR İLE MİKROKAPSÜLASYONU

Bu çalışmada, fluoran boya içerikli termokromik sistemlerin mikrokapsülasyonu amaçlanmıştır. Bu amaçla, fluoran boya,Bisfenol A ve 1-tetradekanol içeren termokromik sistemler, emülsiyon polimerizasyonu metodu kullanılarak poli(metilmetakrilat) ilemikrokapsüllenmişlerdir. Mikrokapsüllerin ısıl özellikleri ve ısıl stabiliteleri diferansiyel taramalı kalorimetre (DSC) ve termalgravimetrik (TG) analizler ile araştırılmıştır. Sıcaklık sensörü ve veri kaydediciden oluşan T-history analiz ile mikrokapsüllerin ısıdüzenleme özelliği test edilmiştir. Aktivasyon sıcaklığının altında ve üstündeki sıcaklıklarda alınan fotoğraf görüntüleri ilemikrokapsüllerin sıcaklık duyarlı tersinir renk değiştirme özellikleri belirlenmiştir. DSC sonuçlarına göre, mikrokapsüllerin 152,6-185,8 J/g aralığında gizli ısı depoladıkları tespit edilmiştir. Aktivasyon sıcaklığının altında renkli olan mikrokapsüllerin aktivasyonsıcaklığının üzerinde renklerini kaybettikleri ve sıcaklıktaki değişime bağlı tersinir renk değişim özelliği sergiledikleri belirlenmiştir.TG analiz sonuçlarından, mikrokapsüllerin tekstil uygulamaları için yeterli ısıl dayanıma sahip olduğu tespit edilmiştir.

MICROENCAPSULATION OF THERMOCHROMIC SYTEMS CONTAINING FLUORAN DYES BY POLY(METHYL METHACRYLATE) WALL FOR TEXTILE APPLICATIONS

In this study, microencapsulation of thermochromic systems containing fluoran dye was aimed. For this purpose, thermochromic systems containing fluoran dye, Bisphenol A and 1-tetradecanol were microencapsulated with poly(methyl methacrylate) using emulsion polymerization method. Thermal properties and thermal stability of the microcapsules were investigated by differential scanning calorimetry (DSC) and thermal gravimetric (TG) analyzes. The thermo-regulation property of the microcapsules was tested by T-history analysis consisting of temperature sensor and data logger. The temperature-sensitive reversible discoloration properties of the microcapsules were determined by photographs taken at temperatures above and below the activation temperature. According to DSC results, microcapsules had latent heat storage in the range of 152.6-185.8 J/g. It was determined that the microcapsules, which were colored below the activation temperature, lost their color above the activation temperature and exhibited reversible color change property depending on change in temperature. From TG analysis results, it was determined that microcapsules had sufficient thermal resistance for textile applications.

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