Stress relaxation in polymeric microlattice materials

Stress effects on the elastic properties of amorphous polymeric materials.

Brillouin light scattering measurements have been used to study the stress induced modification in the elastic properties of two glass forming polymers: polybutadiene and epoxy-amine resin, prototypes of linear and network polymers, respectively. Following the usual thermodynamic path to the glass transition, polybutadiene has been studied as a function of temperature from the liquid well into ...

Molecular engineering of mechanophore activity for stress-responsive polymeric materials

Force reactive functional groups, or mechanophores, have emerged as the basis of a potential strategy for sensing and countering stress-induced material failure. The general utility of this strategy is limited, however, because the levels of mechanophore activation in the bulk are typically low and observed only under large, typically irreversible strains. Strategies that enhance activation are...

VARIATIONS IN PLATELET POLYMERIC MATERIAlS

Ajm of thjs research js to cvaluatc whclhcr tJ1C dccrc:lsc in numbcr of pJalcJcl.<; and t1IC rcduclion in lhcir mcan voIumc, obscrvcd a[lcr contilcl with somc biomatcrial.'i. L1kc placc unjfom1Iy among thc various pJatclct subpopulations. 11lc c((ccts produccd by somc polymcric materiaIs werc measured on the single subpopuJations, isoJatcd by mcans o(ccntri(ugation on PcrcolJ@ gradicnt. A.5 con...

Polymeric triple-shape materials.

Shape-memory polymers represent a promising class of materials that can move from one shape to another in response to a stimulus such as heat. Thus far, these systems are dual-shape materials. Here, we report a triple-shape polymer able to change from a first shape (A) to a second shape (B) and from there to a third shape (C). Shapes B and C are recalled by subsequent temperature increases. Whe...

Polymeric Nanocomposite Materials