Poly ethylene glycol diacrylate crosslinked

Figure 10.3 Mean molecular mass between chemical crosslinks and trapped chain entanglements Mc+e in a cured mixture of a poly(ethylene glycol) diacrylate (PEGDA) and 2-ethylhexyl acrylate (EHA) as a function of the EHA content [52]. Mc+e values were determined from (1/T2s)max and the plateau modulus (see Figure 10.2). A substantial difference in Mc+e value, as determined by these two methods at low crosslink density, is caused by the effect of network defects which decrease volume average network density determined by DMA (see Section 10.3). The molecular mass of PEGDA (Mn = 700 g/mol) is indicated by an arrow. The molecular mass of network chains in cured PEGDA is about three times smaller than that of the initial monomer. The molecular origin of this difference is discussed in Section 10.3...

Poly(methyl acrylate) (PMA) may be used as start material for production of shape-memory material [lOWl]. The addition of poly(ethylene glycol) diacrylate (PEGDA) assists crosslinking process. The insoluble content formed in EB-irradiated PMA increases sharply even at low doses (Table 37) because polymer matrix provides radicals at a yield of 0.77 and PEGDA plays the role of sensitizer. 

Kalakkunnath, S., Kalika, D. S., Lin, H., and Freeman, B. D. (2(X)5). Segmental relaxation characteristics of crosslinked poly(ethylene oxide) copolymer networks. Macromolecules 38, 9679. Kalakkurmath, S., Kalika, D. S., Lin, H., and Freeman, B. D. (2(X)6). Viscoelastic characteristics of U.V. polymerized poly(ethylene glycol) diacrylate networks with varying extents of ciosslinking. 

Lin, H., and Freeman, B. D. (2005a). Gas and vapor solubility in crosslinked poly(ethylene glycol diacrylate). Macromolecules 38, 8394. 

Poly(Propylene Fumarate) (PPF) is a linear, unsaturated, hydrophobic polyester (Structure 12) containing hydrolyzable ester bonds along its backbone. PPF is highly viscous at room temperature and is soluble in chloroform, methylene chloride, tetrahydrofuran, acetone, alcohol, and ethyl acetate [66]. The double bonds of PPF can form chemical crosslinks with various monomers, such as W-vinyl pyrrolidone, poly(ethylene glycol)-dimethacrylate, PPF-diacrylate (PPF-DA), and diethyl fumarate [67,68]. The choice of monomer and radical initiator directly influence the degradative and mechanical properties of the crosslinked polymer. Once crosslinked, PPF forms a solid material with mechanical properties suitable for a range of bone engineering applications. 

---