PSEUDO CROSSLINK

This simplified representation of the morphology shows spheres of polystyrene embedded in a continuous soft elastomeric polybutadiene phase. Here the polystyrene domains act as pseudo crosslinks and the polybutadiene conveys elasticity to the material. When heated above the Tg of polystyrene, the domains soften, disassociate, and the material can be made to flow. When cooled, the polystyrene domains reform and elastomeric behaviour returns. 

The resulting star-like macromers with CTA were solid materials with distinct crystallinity, even at 20 and 40% HPL (Fig. 6). This suggests that even short CTA chains (i.e., DP 12) have the ability to organize into a crystalline lattice, thereby serving as pseudo-crosslinks. Depending on the chemical nature, and the molecular weight, multiphase materials result with variable mechanical properties. Above Tm of the chain segment,... 

The oldest and most common adhesive is the copolymer of 2-ethylhexyl acrylate of 100 weight parts and of acrylic acid of 3-8 weight parts. This adhesive has pseudo-crosslinking by itself because of the inter-molecular association of carboxyl groups on the side chain. However, the tendency of interactions with basic drugs is a disadvantage of this adhesive. 

Have the PPI component function as a flexible spacer of a terminally placed, rigid, crystallizable component derived primarily from gly-colide so as to allow for facile molecular entanglement to create pseudo-crosslinks, which in turn maximize the interfacing of the amorphous and crystalline fractions of the copolymer, leading to high compliance witiiout compromising tensile strength... 

Kumar, M., Chung, J.S., Kong, B.-S., et al., 2013. Synthesis of graphene-polyurethane nanocomposite using highly functionalized graphene oxide as pseudo-crosslinker. Materials Letters 106, 319—321. 

These secondary or pseudo crosslinks, within the use temperature range of the product, increase the stiffness modulus. As indicated above, this type of crosslinking is achieved by phase separation or aggregation and forms over a period of time that ranges from a few hours to several days, depending on storage conditions. Mechanical properties can change over this time period, with improvements usually obtained. 

The mobility of ions in polymeric systems, particularly those that contain multivalent cations, is mainly based on breaking and re-forming ion-chain bonds. For example, in PEO, as in other aprotic solvents, cations are more strongly solvated than anions. In the transitions between different conformational states coupled with chain mobility, ether oxygen-cation bonds will be broken and restored again to produce a new chain conformation. Cation motion and segmental polymer motion are closely coupled in this manner. Cation-chain interaction can involve single polymer chains and also create pseudo-crosslinks between chains. 

---