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Acid-bearing polymers

In order to make water soluble polymer and to enlarge the bioresorbable polymer family on the basis of the same strategy, carboxylic acid bearing polymers derived from malic acid, namely (poly(p-malic acid) or PMLA, were synthesized for the first time many years ago. [Pg.75]

Structural and Morphological Features of Acid-Bearing Polymers for PEM Fuel Cells... [Pg.55]

Factors Determining the Properties of Acid-Bearing Polymers. 61... [Pg.55]

Abstract Chemical structure, polymer microstructme, sequence distribution, and morphology of acid-bearing polymers are important factors in the design of polymer electrolyte membranes (PEMs) for fuel cells. The roles of ion aggregation and phase separation in vinylic- and aromatic-based polymers in proton conductivity and water transport are described. The formation, dimensions, and connectivity of ionic pathways are consistently found to play an important role in determining the physicochemical properties of PEMs. For polymers that possess low water content, phase separation and ionic channel formation significantly enhance the transport of water and protons. For membranes that contain a high... [Pg.55]

Keywords Acid-bearing polymers Chemical microstructure Fuel cells ... [Pg.56]

The properties of acid-bearing polymers are determined by (a) the chemical nature of the monomers (b) the microstructure of the polymer (c) their molecular weight and molecular weight distribution and (d) their morphology in the solid state. Sulfonated polymers usually exhibit a much higher proton conductivity than phosphonylated or carboxylated polymers for a given ion content, and generally aromatic polymers exhibit better chemical and thermal stability than aliphatic polymers. Moreover, physicochemical... [Pg.61]

See other pages where Acid-bearing polymers is mentioned: [Pg.254]    [Pg.711]    [Pg.341]    [Pg.55]    [Pg.59]    [Pg.59]    [Pg.59]    [Pg.60]    [Pg.61]    [Pg.61]    [Pg.61]    [Pg.63]    [Pg.63]    [Pg.63]    [Pg.65]    [Pg.67]    [Pg.73]    [Pg.77]    [Pg.81]    [Pg.85]    [Pg.85]    [Pg.89]    [Pg.91]    [Pg.99]    [Pg.101]    [Pg.103]    [Pg.105]    [Pg.107]    [Pg.114]    [Pg.119]    [Pg.121]   
See also in sourсe #XX -- [ Pg.55 , Pg.59 , Pg.61 ]



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Polymer acid

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