Preparation of Emulsion Templated Porous Polymer Composites Containing Cellulose Nanofibril and Latent Thermal Energy Storage Applications

Öz

In this study, porous polymer composites that can be used as support materials in low temperature latent thermal energy storage applications were produced by emulsion templating method and the morphological, thermal and mechanical properties of the obtained materials were investigated. For this purpose, nanocellulose in the form of fibril was modified in order to make compatible with the emulsion system and used as a filler to improve the properties of porous polymeric foams obtained by polymerization of high internal phase emulsions. The morphological, thermal and mechanical properties of the obtained porous materials were investigated by Scanning Electron Microscopy (SEM), thermogravimetric analysis (TGA) and compression modulus measurements, respectively. In addition, the specific surface area values of the produced support materials were determined with the Brunauer–Emmet–Teller (BET) surface area and pore size analyzer. It has been observed that the addition of cellulose nanofibril filler in porous materials contributes positively to the pore morphology and thermal stability of the composite materials, while increasing the surface area values. The obtained composite materials were used as support materials in the production of shape-stabilized composite phase change materials (PCMs) containing n-pentadecane. As a result of thermal analyzes performed with Differential Scanning Calorimetry (DSC); it was found that composite PCM with a support matrix containing 0.75 wt(%) cellulose nanofibril filler has the highest n-pentadecane encapsulation ratio (61.12%) and the highest thermal energy storage capacity (122.0 J/g).

Anahtar Kelimeler

• Emulsion
• Cellulose
• Composite Material
• Phase Change Materials
• Thermal Energy Storage

Selüloz Nanofibril İçeren Emülsiyon Şablonlu Gözenekli Polimer Kompozitlerin Hazırlanması ve Gizli Isıl Enerji Depolama Uygulamaları

Öz

Bu çalışmada, düşük sıcaklık gizli ısıl enerji depolama uygulamalarında destek malzeme olarak kullanılabilecek gözenekli polimer kompozitler emülsiyon kalıplama yöntemiyle üretilmiş ve elde edilen malzemelerin morfolojik, ısıl ve mekanik özellikleri araştırılmıştır. Bu amaçla fibril formundaki nanoselüloz modifiye edilerek emülsiyon sistemiyle uyumlu hale getirilmiş ve yüksek iç fazlı emülsiyonların polimerizasyonuyla elde edilen gözenekli polimerik köpüklerin özelliklerinin geliştirilmesi amacıyla dolgu olarak kullanılmıştır. Elde edilen gözenekli malzemelerin Taramalı elektron mikroskobu (SEM), termogravimetrik analiz (TGA) ve basma modülü ölçümleriyle sırasıyla morfolojik, ısıl ve mekanik özellikleri araştırılmıştır. Ayrıca üretilen destek malzemelerinin spesifik yüzey alanı değerleri Brunauer–Emmet–Teller (BET) yüzey alanı ve gözenek boyutu analiz cihazı ile belirlenmiştir. Gözenekli malzemelerdeki selüloz nanofibril dolgu katkısının kompozit malzemelerin gözenek morfolojisine ve ısıl kararlılıklarına olumlu katkı sağladığı, yüzey alanı değerlerini ise arttırdığı görülmüştür. Elde edilen kompozit malzemeler n-pentadekan içeren yapıca kararlı kompozit faz değiştiren maddelerin (FDM’lerin) üretiminde destek materyali olarak kullanılmıştır. Diferansiyel Taramalı Kalorimetre (DSC) ile gerçekleştirilen ısıl analizler sonucunda ağırlıkça %0,75 selüloz nanofibril dolgu içeren matrise sahip kompozit FDM’nin en yüksek n-pentadekan kapsülasyon oranına (%61,12) ve en yüksek ısıl enerji depolama kapasitesine (122,0 J/g) sahip olduğu bulunmuştur.

Anahtar Kelimeler

• Emülsiyon
• Selüloz
• Kompozit Malzeme
• Faz Değiştiren Maddeler
• Isıl Enerji Depolama

Kaynakça

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