Supercritical Carbon Dioxide Isolation of Cellulose Nanofibre

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Supercritical Carbon Dioxide Isolation of Cellulose Nanofibre ( supercritical-carbon-dioxide-isolation-cellulose-nanofibre )

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Molecules 2021, 26, 5276 11 of 22 PLA’s morphological changes when chitin and CNF were added can be clearly seen in SEM Molecules 2021, 26, x FOR PEER REVIEW 12 of 23 images. Wedges and flakes characterise the addition of chitin. Figure 5. Comparative analysis of the morphological properties of bamboo and commercial CNF‐reinforced biocompo‐ Figure 5. Comparative analysis of the morphological properties of bamboo and commercial CNF-reinforced biocomposites. sites. At 1% CNF there was no significant difference between the SEM images of the bamboo At 1% CNF there was no significant difference between the SEM images of the bam‐ CNF and commercial CNF. However, at 3% and 5%, a network of white patches was boo CNF and commercial CNF. However, at 3% and 5%, a network of white patches was observed in the fractured surface of the commercial CNF, while the bamboo CNF still observed in the fractured surface of the commercial CNF, while the bamboo CNF still had had a uniform colouration. This network of patches in the SEM images probably showed a uniform colouration. This network of patches in the SEM images probably showed signs signs of pure chitin or CNF, though these were insignificant as no void or cracks were of pure chitin or CNF, though these were insignificant as no void or cracks were observed. observed. The network of CNF fibres was shown to increase in the images from 1% to 5%. The network of CNF fibres was shown to increase in the images from 1% to 5%. Previous Previous studies on PLA/CNF biocomposites reported the agglomeration of CNF in PLA dstuedtioesthoendPiLffAer/eCnNceFinbitohceoimr npaotusirtes[1r8e]p: oPrLteAditshheyadgrgolpohmoebriac,tiaondoCf CNNF FisihnyPdLrAopdhuileict.oTthe differenceiintthheeniratnuarteuroef P[1L8A]: aPnLdACiNs hFypdrroobpahbolybirce,saunltdedCiNnFpoisorhmydercohpahnilciac.l Tprhoepderiftfiers‐. ence in the nature of PLA and CNF probably resulted in poor mechanical properties. The SEM images indicated that the neat PLA exhibited a smooth, homogeneous, and compact

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