21 research outputs found
Tailoring Mechanical Properties of SolâGel Hybrids for Bone Regeneration through Polymer Structure
Factors related to enrolment in early therapy services following neonatal intensive care unit discharge
Tailoring mechanical properties of sol-gel hybrids for bone regeneration through polymer structure
Bioglass was the first synthetic biomaterial that formed a chemical bond to bone. Although bioactive glass scaffolds can mimic boneâs porous structure, they are brittle. Solâgel derived hybrids could overcome this problem because their nanoscale conetworks of silica and organic polymer have the potential to provide unique physical properties and controlled homogeneous biodegradation. Copolymers of methyl methacrylate (MMA) and 3-(trimethoxysilyl)propyl methacrylate (TMSPMA) have been used as an organic source for hybrids to take advantage of their self-hardening property. However, the effect of well-defined poly(MMA-co-TMSPMA) architecture in the hybrid system has not been investigated. Here, linear, randomly branched, and star shaped methacrylate based copolymers were synthesized via reversible additionâfragmentation chain transfer (RAFT) polymerization method. These copolymers were then used to fabricate hybrids. The 3-D polymer structure had a significant effect on mechanical properties, providing higher strain to failure while maintaining a compressive strength similar to solâgel glass. Star copolymerâSiO2 hybrids had a modulus of toughness 9.6-fold greater and Youngâs modulus 4.5-fold lower than a solâgel derived bioactive glass. During in vitro cell culture, MC3T3-E1 osteoblast precursor cells adhered on the surface regardless of the polymer structure. Introducing star polymers to inorganicâorganic hybrids opens up possibilities for the fine-tuning physical properties of bone scaffold materials