Semi-interpenetrating network

Interpenetrating network polymer. In a separate study, it was shown that cardanol-formaldehyde resins foiTn semi-interpenetrating networks with polymethylmethacrylate (PMMA). Although interpenetration of CF... 

A semi-interpenetrated network was obtained by bulk polymerization of 2-hydroxye-thyl methacrylate incorporated in DMF treated PET films by solvent-exchange technique, followed by treatment of films in e-lectrical discharges. Heparinization was accomplished by reacting glutaraldehyde with heparin and poly(2-hydroxyethyl methacrylate) present on the surface of modified polyester films. The immobilization of heparin was indirectly evidenced by chromatographying the silylated hydrolyza-tes of heparinized PET films and heparin, respectively. In vitro experiments demonstrated the enhanced thromboresistance of heparinized films. 

Semi-gloss alkyd paint formulation, 18 6 It Semi-interpenetrating network (IPN) approaches, 10 436 Semi-IPN (interpenetrating polymer network) hydrogels, 13 733 Semikilled steels, 23 291 Semimoist pet foods, 10 849 Semipermanent cells, 14 228 Semiphorone, 14 583 Semiportable mri system, 23 860-861 Semiregenerative reforming operations, 25 166... 

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. 

There are several interesting applications reported in the literature, such as insulated wire and cable, UV cross-linking of drawn fibers, and tapes from ultra-high-molecular-weight polyethylene. Semi-interpenetrating networks (IPNs) from acrylates and polyurethanes are suitable as UV curable adhesives with high elasticity, good impact resistance, and excellent adhesion to a variety of substrates. ... 

Extensive research has been conducted and reviewed on interpenetrating polymer networks during the past decade (31-33). IPNs can be categorized into Semi-l-IPN and Semi-2-IPN. Semi-2-IPNs are those in which crosslinkable oligomers or materials are polymerized into the linear matrix. Semi-interpenetrating networks could have combined polymers that have same or different repeating units. 

Blends of BNIs and BMIswith Linear Polymers Semi-interpenetrated Network Concept... 

Arkles BC (1987) Manufacture of curable silicone semi-interpenetrating networks. US Patent 4714739... 

Heinen W, Wenzel CB, Rosenmoeller CH, Mulder FM, Boender GJ, Lugtenburg J, de Groot HJM, Van Duin M, Klumperman B (1998) Solid-state NMR study of miscibility and phase separation in blends and semi-interpenetrating networks of 13C-labeled poly(styrene-co-acrylonitrile) and poly(styrene-co-maleic anhydride). Macromolecules 31 7404-12. 

Hao, J. Deng, X. Semi-interpenetrating networks of bacterial poly(3-hydroxybutyrate) with net-poly(ethylene glycol). Polymer 2001, 42, 4091 1097. 

The microphase separation of a semi-interpenetrating network based on polyurethane and poly(epoxy isocyanurate) containing Fe2O3 was studied by dynamic mechanical spectroscopy. The preferential absorption of polyurethane on... 

Sjmthesis of a linear polymer that is then trapped in a crosslinked network formed from a second component. Since only one polymer is crosslinked, this is a semi-interpenetrating network. This is also known as a tps iAo-interpenetrating network. 

An alternative approach52 involves polymerization of conventional polymer in the presence of a soluble conducting polymer (alkylated thiophene) to form a semi-interpenetrating network. The polythiophene was dissolved in solutions of styrene and divinyl benzene conductivities in the range 0.01-0.10 S cm-1 were obtained. 

Elisseeff, J., McIntosh, W., Anseth, K., Riley, S., Ragan, P., and Langer, R. (2000) Photoencapsulation of chondrocytes in poly(ethylene oxide)-based semi-interpenetrating networks, J. Biomed. Mater. Res., 51, 164—171. 

Other modifications of vegetable oils in polymer chemistry include the introduction of alkenyl functions, the study of novel polyesters and polyethers and the synthesis of semi-interpenetrating networks based on castor oil (the triglyceride of ricinoleic acid) [42], and also the production of sebacic acid and 10-undecenoic acid from castor oil [44]. Additionally, the recent application of metathesis reactions to unsaturated fatty acids has opened a novel avenue of exploitation leading to a variety of interesting monomers and polymers, including aliphatic polyesters and polyamides previously derived from petrochemical sources [42, 45]. 

Table 11.9). PBT/EPR blends were prepared either by reactive or mechanical blending. In the first case, BDO and DMT, at a molar ratio = 2, with 300 ppm catalyst, were charged into a N -flushed, stainless steel, stirred reactor. After 1 h at 190°C, methanol started to be collected for an hour. Next, the temperature was increased to 210°C and 30 wt% of EPR particles were added into the reaction mixture. The polymerization of PBT in the presence of EPR resulted in a semi-interpenetrating network. TGA showed that the weight loss of EPR was negligible thus EPR was found to be thermally stable during polymerization. 

A commercial blend consisting of a thermoplastic polyamide (PA-6 or PA-66) and 5-25 wt% of a crosslinkable silicone, which forms a semi-interpenetrating network (semi-IPN) upon curing, has been offered under the trade name of Rim-... 

B) Thermoset-thermoplastic blends and semi-interpenetrating networks (Semi-IPN)... 

Fei, J., Zhang, Z., and Gu, L. 2002. Bending behavionr of electroresponsive polyfvinyl alcohol)/ polyfacrylic acid) semi-interpenetrating network hydrogel fibres under an electric stimulus. Polym Int. 51 502-509. 

F. Vidal, J.F. Popp, C. Plesse, C. Chevrot, and D. Teyssie, Feasibility of conducting semi-interpenetrating networks based on a poly(ethylene oxide) network and poly(3,4-ethylene-dioxythiophene) in actuator design, J. Appl. Polym. Set, 90 (13), 3569-3577 (2003). 

Kim HK, Wang XS, Fujita Y, Sudo A, Nishida H, Fujii M, Endo T. 2005b. Reversible photo mechanical switching behavior of azobenzene containing semi interpenetrating network under UV and visible light irradiation. Macromol Chem Phys 206 2106 2111. 

Buxton, A. N., Zhu, J., Marchant, R., West, J. L., Yoo, J. U., Johnstone, B. Design and characterization of poly(ethylene glycol) photopolymerizahle semi-interpenetrating networks for chondrogenesis of human mesenchymal stem cells. Tissue Engineering. 2007,13, 2549-2560. 

Preparation of organic/inorganic hybrid semi-interpenetrating network poi mier eiectroiytes based on poiy(ethyiene oxide-co-ethyiene carbonate) for aii-soiid-state iithium batteries at eievated temperatures, 55(12), 2799-2808. 

H. Yang, S.T. Lopina, Extended release of a novel antidepressant, venlafaxine, based on anionic polyamidoamine dendrimers and poly(ethylene glycol) containing semi-interpenetrating networks, J. Biomed. Mater. Res. A 72 (2005) 107-114. 

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