Preferred Label : model network;
IUPAC definition : polymer network synthesized using a reactant or reactants of known molar mass or masses
and chemical structure.;
Scope note : loose ends and ring structures reduce the concentration of elastically active network
chains and result in the shear modulus and young s modulus of the rubbery networks
being less than the values expected for a perfect network structure.; in addition to loose ends, model networks usually contain ring structures as network
imperfections.; a model network can be prepared using a non-linear polymerization or by crosslinking
of existing polymer chains.; physical entanglements between network chains can lead to an increase in the concentration
of elastically active network chains and, hence, increases in the shear modulus and
the young s modulus above the values expected for a perfect network structure.; a model network is not necessarily a perfect network. if a non-linear polymerization
is used to prepare the network, non-stoichiometric amounts of reactants or incomplete
reaction can lead to network containing loose ends. if the crosslinking of existing
polymer chains is used to prepare the network, then two loose ends per existing polymer
chain result. in the absence of chain entanglements, loose ends can never be elastically
active network chains.;
Origin ID : MT07568;
See also
polymer network synthesized using a reactant or reactants of known molar mass or masses
and chemical structure.
