Solid State Behavior of Linear Polyesters and Polyamides |
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Page 44
Chemical Healing in Linear Polycondensates Chemical healing first came to light
in initial tests of PET samples - 0 . 4 mm thick strips of commercial PET , prepared
as shown in Figure 9 , inserted between polished steel plates and affixed .
Chemical Healing in Linear Polycondensates Chemical healing first came to light
in initial tests of PET samples - 0 . 4 mm thick strips of commercial PET , prepared
as shown in Figure 9 , inserted between polished steel plates and affixed .
Page 101
Shrinkage and birefringence vs . time of heat - treatment for a fiber of initial
birefringence 0 . 042 . The heat treatment was carried out at 160°C , under 2 . 1
MPa . tallization " half - times , " t1 / 2 ) for conditions of constant load and
constant ...
Shrinkage and birefringence vs . time of heat - treatment for a fiber of initial
birefringence 0 . 042 . The heat treatment was carried out at 160°C , under 2 . 1
MPa . tallization " half - times , " t1 / 2 ) for conditions of constant load and
constant ...
Page 108
The initial crystals are very imperfect , but increase in perfection during treatment
. The sequence is depicted in Figure 21 . During rapid crystallization , defects
such as kinks and chain ends are grown into the fibrillar crystals . With time ,
these ...
The initial crystals are very imperfect , but increase in perfection during treatment
. The sequence is depicted in Figure 21 . During rapid crystallization , defects
such as kinks and chain ends are grown into the fibrillar crystals . With time ,
these ...
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achieved acid additional amorphous annealing Appl applied aspect average behavior block bonding changes Chem chemical composites conclusion constant crack crystallinity crystallization curves decreases deformation density depends determined diameter diffusion direction distribution domains draw ratio drawn effect element energy Equation experiments extrusion factor fatigue fiber Figure fracture fracture toughness function given groups growth healing heat higher important increasing indicated initial length linear load lower material matrix maximum measurements mechanical melt method microfibrils microstructure modulus molded molecular weight molecules nylon nylon 66 observed obtained occurs orientation peak phase Phys polyamides polycondensation polyesters Polymer Sci polymerization properties range reaction regions reported Reprinted from Ref respectively samples SAXS scattering shows solid solid state polycondensation solid-state specimen speed stage strain strength stress structure studied Table temperature tensile units values yield