KOSEN 한인과학기술자네트워크

아래의 자료는 LG상남도서관(http://www.lg.or.kr)을 통해 검색된 자료입니다. 원하시는 자료가 있으시면 웹을 통해 다운로드 받으시면 됩니다. Chemical valves based on poly(4-vinylpyridine)-filled microporous membranes, Mika AM, Childs RF, Dickson JM, Journal of Membrane Science , V.153 N.1 , 45-56 초록 Microporous membranes containing poly(4-vinylpyridine) anchored within the pores exhibit very large chemical valve effects with pressure-driven permeability changing by more than three orders of magnitude as a function of pH. The factors affecting the magnitude of this valve have been examined with a series of well characterized, poly(4-vinylpyridine)-modified, microporous polypropylene membranes. The permeability of these membranes to HCl/H2O at different pHs was measured as a function of pore size of the starting base membrane and the amount of poly(4-vinylpyridine) anchored within the pores. An analysis of these results shows that the magnitude of the chemical valve is largely determined by the permeability of the membranes in their open-valve states, i.e., high pH. While the magnitude of the chemical valve effect exhibited by the membranes varied, the pH at which the valve closed was in each case found to be similar and independent of pore size of the starting membrane or amount of poly(4-vinylpyrid ne) anchored within the pores. The permeability of the membranes at low pH (when the anchored poly(4-vinylpyridine) is ionized) was examined using two existing models of hydrodynamic permeability, namely, the pressure-driven flow through a right-cylinder pore partly obscured by a graft layer of a hydrodynamic thickness L-H (brush model) and the hydrodynamic flow through supported hydrogels (pore-filled model). The theory of polyelectrolytes in the semi-dilute region was used to estimate the chain parameters of the incorporated polyelectrolyte. The results obtained show that the applicability of each model depends on the pore size of the substrate membranes and the molecular weight of the polyelectrolyte. CLOSURE CHARACTERISTICS OF A THERMALLY RESPONSIVE SINGLE ION-TRACK PORE DETERMINED BY SIZE EXCLUSION METHOD, Reber N, Spohr R, Wolf A, Omichi H, Tamada M, Yoshida M , Journal of Membrane Science , V.140 N.2 초록 Cross-linked poly(N-isopropylacrylamide) (NIPAAm) gel was grafted on the wall of a single ion-track pore in poly(ethylene terephthalate) (PET). The opening and closing of the pore is controlled by temperature and observed by electric conductivity, In the shrunken state of the gel, ions and molecules can penetrate the membrane through the free volume of the pore, In the swollen state, the gel clogs the pore. Using mixtures of polyethylene glycol (PEG) of various molecular weights and 0.1 N potassium chloride, it was demonstrated that the responsive pore acts as a thermally controllable valve preventing the passage of PEG molecules larger than 2 nm. The mean value of the hydrogel mesh size is estimated to be (1.3+/-0.05) nm 아래의 자료는 산업기술정보원(KINITI)를 통해 검색된 자료입니다. 웹(http://www.kiniti.re.kr)을 통해 원문신청이 가능합니다. FIFTH INTERNATIONAL CONFERENCE: POLYMERS IN MEDICINE AND SURGERY, Anon, Fifth International Conference: Polymers in Medicine and Surgery., var paging, 1986 Abstract : This conference contains 48 papers. Some of the topics covered included polymer biocompatibility, rubber and hydrogel biomaterials, surgical implants, plastic implant mechanical properties, cell-polymer interactions, infection-resistant plastics, biodegradable materials, dextran, plasma volume expander, polymer surface properties, cell adhesion in vascular graft materials, heparin conjugate treated polymer, membrane biocompatibility, blood complement activation, extra corporeal blood purification, polyether biomaterials, silicone gel scar treatment, occular implant polymers, arterial wall regeneration, artificial heart valve leaflets, pharmaceutical interactions, targeted conjugate blood polymers, polymer-modified enzymes, suture biocompatibility and in-vitro alternative techniques to in-vivo toxicologic evaluation of biomedical polymers. >초미세 유량 혈관에 이용하는 polymer hydrogel valve연구 결과에 >대한 정보가 필요합니다

>초미세 유량 혈관에 이용하는 polymer hydrogel valve연구 결과에 >대한 정보가 필요합니다 The reduced adsorption of lysozyme at the phosphorylcholine incorporated polymer/aqueous solution interface studied by spectroscopic ellipsometry, Biomaterials, Volume 20, Issue 16, August 1999, Pages 1501-1511 New strategies for the synthesis of amphiphilic networks, Reactive and Functional Polymers, Volume 41, Issues 1-3, 15 July 1999, Pages 177-184