About Crosslinking degree and storage modulus
The degree of crosslinking is directly related to the stiffness of crosslinked PE. Consequently, the degree of crosslinking of PE can be conveniently evaluated using the storage modulus to establish the quantitative relationship between gel content and storage modulus.
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6 FAQs about [Crosslinking degree and storage modulus]
Do viscoelastic properties of cross-linked polymers affect cross-link density?
The viscoelastic properties of polymers such as the storage modulus, the loss modulus, and the loss tangent show a positive exponential relation with the apparent cross-link density. This work may shed some light on the relevant experimental and theoretical studies on cross-linked polymers.
Why do chemical crosslinks increase storage modulus across a temperature sweep?
Therefore, for GelMA with coordinated physical gelation and chemical crosslinking, chemical crosslinks are in a much higher abundance than physical bonds. This phenomenon may explain the higher change in storage modulus across a temperature sweep when compared to the change in storage modulus for GelMA with a lower DS.
Does cross linking increase the storage modulus?
Cross linking increases the interconnection between different long back bone chains, leading to an increase in the elastic energy (stress applied and strain) or storage modulus of the polymer. Cross linking brings about a decrease in chain mobility.
How does storage modulus affect crosslinking behavior in XLPE?
During the time sweeping stage, the variation in storage modulus reflects the degree of crosslinking for XLPE. From this stage, all relevant parameters of crosslinking behavior, such as scorch time, crosslinking rate, and final degree of crosslinking can be accurately determined.
Why do crosslinkers have a higher modulus?
The key concept is that each crosslink functions as a small spring, making network deformation more difficult and resulting in a higher modulus. With more crosslinkers, or molecular scale springs, the material has a higher modulus, or is more difficult to deform.
What is the relationship between DS and storage modulus?
In contrast, in GelMA hydrogels that do not have coordinated physical gelation and chemical crosslinking, i.e. photocured after incubation at 37°C, there is an inverse relationship between DS and change in storage modulus (G’) across the temperature sweep.