Storage modulus crosslinking degree

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.

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 crosslink density affect a three-dimensional network structure material?

The crosslinked density of the three-dimensional network structure material is directly related to the mechanical properties of the material. The increase in crosslink density usually corresponds to higher strength and modulus, with a corresponding reduction in toughness [22, 23].

How do you find the density of crosslinks in a polymer?

Zibiao Li The density of crosslinks in a polymer can be experimentally obtained by the equation d = E r 3 R (T g + 40), where d = crosslinking density per unit volume (mol m−3), E’ r represents the storage modulus in the rubbery plateau (MPa), R is the universal gas constant, and Tg is the glass transition temperature [42,43].

Do high cross-link density networks improve mechanical performance?

At room temperature, the networks of higher cross-link densities demonstrated substantial enhancements in mechanical performance when compared to their counterparts with lower cross-link density. Meanwhile, networks with a high cross-link density have a high content of dynamic bonds.

Does increasing cross-link density reduce temperature sensitivity of processable covalent network polymers?

Conversely, augmenting cross-link density tends to reduce the temperature sensitivity of processable covalent network polymers. In this work, we simultaneously augmented the number of dynamic bonds and cross-linking sites, with the process further enhanced by the catalytic influence of the amidine-urea bond on the oxime-carbamate bond.