THESIS - ROC CH ... - FINAL - resubmission.pdf - University of Guelph

More documents

Recommendations

Info

w/w SPI. These aggregates are identified as the same macroscopic agglomerates seen from Figure 6.2c. SPI NSF0.25 SMF0.25 SMF1.0 100 µm 100 µm 100 µm SMF0.5 SMF2.5 Figure 6.4: Polarized light microscopy of cellulose/SPI blend films displaying homogeneity of dispersed fibers with increasing concentration from 0.25%. Circled are macroscopic aggregates formed by micrometer-sized fibers found with fiber loading of 1% and greater 72 100 µm 100 µm 100 µm
SEM images of the cryo-fractured surfaces of SPI, SNF0.25, SMF0.5, SMF1.0, and SMF 2.5 are shown in Figure 6.5. The fractured plane was perpendicular to the machine direction allowing for visual indication of fiber alignment if it were to be present. However, no visible evidence of fibers was observed for any of the specimens. This was not expected as homogenous dispersion of fibers was evident via polarized light. This may suggest that cellulose and SPI have good interfacial adhesion preventing the pull out of fibers upon fracture. Poor adhesion would result in the appearance of visible fiber structures due to the fiber surfaces disengaging from the polymer matrix. The control specimen of SPI without fiber addition had relatively smooth fracture surface in comparison to all other specimens. With the addition of SNF’s at 0.25%w/w SNF/SPI, irregularities could be seen to scatter across the surface. Adding SMF’s at the same loading concentration resulted in an increased surface roughness. Compared to other specimens, edges with higher variances in the depth to height ratio were observed. This jagged texture was also apparent with SMF0.5 but with a flatter appearance. The serrated valleys can be seen to widen apart with further increase in SMF addition at 1.0 and 2.5% w/w SMF/SPI. In addition to the widening of the valleys, SMF1.0 and SMF 2.5 specimens have additional sunken trenches that streak across the surfaces. The most apparent of this behaviour can be seen with SMF2.5 at the highest fiber concentration with deep elongated cavities. The increasing roughness with increasing fiber addition suggests the presence of filler material. Although interfacial adhesion prevented the visual appearance of intact fibers, the rough texture may indicate that interaction is not ideal (Wang et al. 2006; Wu et al. 2009). The increased defects seen with high fiber content may negatively affect material properties. 73
Page 1 and 2:
A Study on the Extrusion of Soy Pro
Page 3 and 4:
ACKNOWLEDGEMENTS My research would
Page 5 and 6:
4.3.9 Statistical Analysis.........
Page 7 and 8:
LIST OF TABLES Table 2.1: Compariso
Page 9 and 10:
Figure 5.2: Light optical microscop
Page 11 and 12:
1.0 INTRODUCTION The production of
Page 13 and 14:
einforcement material. Research int
Page 15 and 16:
via centrifugation into four fracti
Page 17 and 18:
zones are synonymous to feeding, tr
Page 19 and 20:
Ralston (2008) investigated the ext
Page 21 and 22:
onding between hydroxyl groups and
Page 23 and 24:
Table 2.2: Summary of cellulose par
Page 25 and 26:
through the use of enzymes have pro
Page 27 and 28:
matrix such as soy protein (Wang et
Page 29 and 30:
4) Explore the extraction process f
Page 31 and 32: 4.3 METHODS 4.3.1 SAMPLE PREPARATIO
Page 33 and 34: a Figure 4.2: a) Schematic of extru
Page 35 and 36: length at break by the initial grip
Page 37 and 38: 4.4 RESULTS AND DISCUSSION 4.4.1 SP
Page 39 and 40: Further experiments were carried ou
Page 41 and 42: Figure 4.5: Film with rough texture
Page 43 and 44: extrusion screw to continuously bre
Page 45 and 46: stopped which fixes the spherical s
Page 47 and 48: 4.4.3 MECHANICAL PROPERTIES Mechani
Page 49 and 50: Elongation at break (%) Figure 4.10
Page 51 and 52: Table 4.5: Water vapor permeability
Page 53 and 54: 4.4.5 FTIR ANALYSIS The main absorb
Page 55 and 56: 4.4.6 CONCLUSION The extrusion of S
Page 57 and 58: 5.3 METHODS 5.3.1 CELLULOSE EXTRACT
Page 59 and 60: For mechanical treatments, the obta
Page 61 and 62: initial soy biomass; SNF and SMF. T
Page 63 and 64: compiled by Moon et al. (2011), thi
Page 65 and 66: RSH: 5min HPH: 20 passes, 4000 - 60
Page 67 and 68: SMF micrographs, the presence of fi
Page 69 and 70: process as described. However, it m
Page 71 and 72: a peak at 22.6° is representative
Page 73 and 74: chemical and mechanical treatment h
Page 75 and 76: 6.3 METHODS 6.3.1 SAMPLE PREPARATIO
Page 77 and 78: 6.3.3 FILM CONDITIONING Similar to
Page 79 and 80: increased in size. At fiber concent
Page 81: 6.4.2 MORPHOLOGY AND STRUCTURE Due
Page 85 and 86: Table 6.1: Mechanical properties of
Page 87 and 88: cellulose and SPI. This high interf
Page 89 and 90: concentrations at isolated sites. A
Page 91 and 92: Similar to Section 4.4.5, dominatin
Page 93 and 94: Further analysis of the Amide II ba
Page 95 and 96: specimens that have been cryo-crush
Page 97 and 98: crushing. Conversely, this could al
Page 99 and 100: 7.0 EXPLORATORY WORK WITH TIO 2 NAN
Page 101 and 102: 7.3.2 COMPOUNDING AND EXTRUSION Com
Page 103 and 104: smaller size of P90, the ability to
Page 105 and 106: Table 7.1: Mechanical Strength of T
Page 107 and 108: Modulus of Elasticity (MPa) 120 110
Page 109 and 110: (21 nm) particle was seen to have a
Page 111 and 112: 7.4.3 MECHANICAL PROPERTIES OF TIO2
Page 113 and 114: Tensile Strenght (MPa) 12 11 10 9 8
Page 115 and 116: Modulus of Elasticity (MPa) 200 180
Page 117 and 118: 8.0 CONCLUSIONS AND RECOMMENDATIONS
Page 119 and 120: The viability of introducing a comp
Page 121 and 122: acting as a coupling agent for furt
Page 123 and 124: Cherian BM, Leao AL, Souza SFD, Tho
Page 125 and 126: Kacurakova M, Capek P, Sasinkova V,
Page 127 and 128: Pääkkö M, Ankerfors M, Kosonen H
Page 129: Wang N, Ding E, Cheng R (2008) Prep
show all

THESIS - ROC CH ... - FINAL - resubmission.pdf - University of Guelph

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?