1992
DOI: 10.1002/macp.1992.021931012
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Polymers of carbonic acid, 8. Linear polybiurets

Abstract: Linear polybiurets can be synthesized by polycondensation of chloroformyl isocyanate and N,hr-bis(trimethylsilyl)-qcudiaminoalkanes or silylated aromatic diamines. The polybiurets were characterized by elemental analyses, inherent viscosity measurements, IR spectroscopy, 'H , I3C, I5N NMR spectroscopy in solution, differential scanning calorimetry (DSC) measurements, wide-angle X-ray scattering (WAXS) and thermogravimetric analyses. All polybiurets are semicrystalline materials with a low rate of crystallizati… Show more

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Cited by 7 publications
(5 citation statements)
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“…[4][5][6][7][8][9][10][11][12][13][14][15] the field of temporary therapeutic applications, PCL is a degradable polymer of great interest in such as sustained drug delivery systems, surgical the field of sustained drug delivery due to its exsutures, and osteosynthetic devices. [1][2][3] In this cellent permeability to drugs.…”
Section: Introductionmentioning
confidence: 99%
“…[4][5][6][7][8][9][10][11][12][13][14][15] the field of temporary therapeutic applications, PCL is a degradable polymer of great interest in such as sustained drug delivery systems, surgical the field of sustained drug delivery due to its exsutures, and osteosynthetic devices. [1][2][3] In this cellent permeability to drugs.…”
Section: Introductionmentioning
confidence: 99%
“…The characteristics of the synthesized copolymers are a longer time (ú2 h) and decrease the yield and the length of the chains. 21 listed in Table II. All the copolymers synthesized have an M n close to that expected and relatively Table I presents the values of M n , M w , the polydispersity index, and the yield, obtained for low polydispersity.…”
Section: Copolymer Synthesis Microsphere Preparationmentioning
confidence: 99%
“…1) of bulk polymerization, this phenomenon is well spectra. It should be noticed that for all the synthesized copolymers the M w calculated by an abknown to be due to transesterification and backbiting 21,23 reactions. In the case of bulk PLA synsolute method was different from that determined by HPSEC using polystyrene standards (results thesis, transesterification reactions occur only at high temperature (ú120ЊC) and lead to a large not shown).…”
Section: Copolymer Synthesis Microsphere Preparationmentioning
confidence: 99%
“…Polybiuret synthesis has thus been difficult, but the reaction between chloroformyl isocyanate and N,N-bis(trimethylsi1-y1)diamines was found to give polybiurets for the first time. 4 Recently we reported some preliminary results of the polyaddition of benzyloxyamine with diphenylmethane diisocyanate to give a novel type of p~lybiuret.~ This article describes the results of detailed studies on the model reactions, facile synthesis and deprotection of polybiurets, and characteristic properties of the resulting polybiurets including solubility and specific adsorption of metal cations.…”
Section: Introductionmentioning
confidence: 99%