Semi-interpenetrating networks SIPNs

So, the PVA/poly(sodium styrene sulphonate) [PSSNa] blend was obtained by casting aqueous solution of polymers mixture (PVA with Mw= 124,000-186,000 and HD=99% and PSSNa with Mw= 70,000). The resulted films were crosslinked with 1,2-dibromethane in gaseous phase. A semi-interpenetrating network (SIPN) in which polyelectrolyte (PSSNa) chains are trapped inside a based PVA network was obtained [44], A totally miscible blend with a very good film clarity and high mechanical resistance [44] resulted. 

HA in combination with collagen has been used to form semi-interpenetrating networks (SIPNs) and endothelial cell attachment was realized within microfluidic channels aiming at blood vessel formation. These SIPNs were suitable for enabling fibroblast and chrondroqhe encapsulation and subsequent proliferation (Ji et al, 2011). 

Note 2 Semi-interpenetrating polymer networks may be further described by the process by which they are synthesized. When an SIPN is prepared by a process in which the second component polymer is formed or incorporated following the completion of formation of the first component polymer, the SIPN may be referred to as a sequential SIPN. When an SIPN is prepared by a process in which both component polymers are formed concurrently, the SIPN may be referred to as a simultaneous SIPN. (This note has been changed from that which appears in ref [4] to allow for the possibility that a linear or branched polymer may be incorporated into a network by means other than polymerization, e.g., by swelling of the network and subsequent diffusion of the linear or branched chain into the network.). 

Semi-Interpenetrating Polymer Network (SIPN) A semi-interpenetrating polymer network (SPIN) is a combination of two or more crosslinked polymers with two or more linear or branched polymers, at least one of which was synthesized and/or crosslinked in the presence of the others. An SIPN is distinguished from an IPN because the constituent linear or branched macromolecules can, in principle, be separated from the constituent polymer network(s) without breaking chemical bonds it is a polymer blend [7]. 

PDMS Polydimethylsiloxane SIPN semi-interpenetrating polymer network... 

Interpenetrating/Semi-Interpenetrating Polymer Network (IPN/SIPN)... 

Cunha FOV, Melo DHR, Veronese VB, Forte MMC. 2004. Study of castor oil polyurethane-poly (methyl methacrylate) semi-interpenetrating polymer network (SIPN) reaction parameters using a 23 factorial experimental design. Mater Res 7 539-543. 

A semi-interpenetrating polymer network (SIPN) is a combination of a network polymer and a linear polymer. A SIPN is usually prepared by the polymerization of a multifunctional monomer in the presence of a linear polymer [1], Qo derivatives and Ciso-containing polymers form aggregates in solution and in the solid state [2-18]. For double-C o-end-capped polymers in which both ends of each polymer chain are capped with Cgo, the aggregation of C,so leads to a network-like material. Therefore, a combination of a double-C,so-end-capped polymer and a linear polymer produces a material resembling a SIPN and is termed a pseudo-SIPN. This chapter discusses the mechanical and optical properties of some pseudo-SIPNs involving double-C,so-end-capped polymers. 

---