2017
DOI: 10.1002/pen.24532
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Reinforcement effect of cellulose nanocrystals in thermoplastic polyurethane matrices characterized by different soft/hard segment ratio

Abstract: Commercial polyurethanes, characterized by different soft/hard segment ratios, were used as matrices for the production of TPU/cellulose nanocrystal (CNC) nanocomposite films. TPU have excellent mechanical properties, chemical stability, easy processing, and can be used in some different application fields as biomedical sector. The selected grades exhibit excellent abrasion resistance, toughness, transparency, hydrolytic stability, and fungus resistance. In this context, the main objective was to understand ho… Show more

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Cited by 18 publications
(13 citation statements)
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“…As can be seen from Figure , the water absorption capacity values for 40 and 65°C were statistically identical and higher than values for 20°C. This result may be attributed to the fact that, at temperatures above T g of SMPU, the temperature sensitive free volume change in the soft segments and higher molecular mobility would create more porous structure that water can be entrapped. When absorption capacity is investigated with respect to finishing treatment type; raw, Pulcra HPU and neat SMPU treated samples had statistically identical and lower capacity values confirming WVPR results under different temperatures.…”
Section: Resultsmentioning
confidence: 99%
“…As can be seen from Figure , the water absorption capacity values for 40 and 65°C were statistically identical and higher than values for 20°C. This result may be attributed to the fact that, at temperatures above T g of SMPU, the temperature sensitive free volume change in the soft segments and higher molecular mobility would create more porous structure that water can be entrapped. When absorption capacity is investigated with respect to finishing treatment type; raw, Pulcra HPU and neat SMPU treated samples had statistically identical and lower capacity values confirming WVPR results under different temperatures.…”
Section: Resultsmentioning
confidence: 99%
“…Tekstil ve Mühendis [39]. Film numunelerinde matris olarak kullanılan SMPU matrisinin T g 'sinin üstündeki sıcaklıklarda (40°C) serbest hacmin artmasına bağlı olarak su absorpsiyon kapasitesinde artış meydana gelmiştir [40]. Ayrıca, SMPU matrisinin T g 'sinin üstündeki sıcaklıklarda, CNW içeren film numunelerinde su molekülleri sıcaklığın etkisi ile birlikte amorf bölgelerin yanı sıra kristalin bölgelerdeki partiküllerle de etkileşime girebilmektedir.…”
Section: Sayfa 18unclassified
“…These comprehensive properties are not available in many other polymer materials . PU is a block copolymer composed of a hard segment and a soft segment . There are a large number of hydrogen bonds between the segments as the result of the presence of a massive of polar groups, and microscopic phase isolation exists in the materials in the virtue of thermodynamic incompatibility between the hard and soft segments .…”
Section: Introductionmentioning
confidence: 99%