Graft copolymers. See

A series of polyamine-graft copolymers (See Sect. 4.3) were found to form microdomain structure and to exhibit unique biomedical behavior at the interface with living cells, e.g. blood platelets or lymphocytes. Although a number of postulates were proposed to explain the unique behavior of microdomain-structured surface, mechanisms for the mode of interaction of living cells with any of the domain-structured materials have not been adequately explained. In Sect. 4, the author will review results on the biomedical behavior of SPUs, HEMA-STY, and polyamine-graft copolymers, and discuss their interfacial properties in terms of the random network concept of water molecules on the material s surface. 

The synthesis and purification of polystyrene methacryloyl macromonomers (PS-MA) in the molecular weight range Mn= 1000-2000 g mol 1 by living anionic polymerization of styrene (S), termination with ethylene oxide (EO), and subsequent reaction with methacrylic chloride has already been described in detail elsewhere [180] (see also Scheme 16). In this context it has to be emphasized that the hydroxyethyl-terminated PS-MA macromonomer precursor (PS-OH) as obtained after purification of the crude PS-OH by silica column chromatography (cyclohexane/dichloromethane 1/1 v/v) and as charged in the PS-MA synthesis still contains up to about 15 wt-% of non-functionalized polystyrene (PS-H). This PS-H impurity of the PS-MA macromonomer does not interfere with the PS-MA synthesis and the subsequent TBA/PS-MA copolymerization and is easily and conveniently removed from the resulting PTBA-g-PS graft copolymer (see below). 

Four different forms alternating, block, random, and graft copolymers (see Text Fig. 19.14)... 

We have also observed that, at elevated temperature (50°C), DPE could effectively cap the living anionic polyferrocenylsilane directly.30 Therefore, the addition of DMSB to pump up the activity of PFS anionic chain ends can potentially be omitted, but the yield of the isolated PFS- -PMMA is significantly reduced.31 The living DPE-capped PFS polymers also can react with chloromethyl functionalities of poly(styrene-co-chloromethylstyrene) (PS-co-PCMS), leading to the first PS-g-PFS graft copolymers (see Scheme 3.10).30... 

Fq = gel fraction obtained after elimination of residual catalyst, umeacted comonomers and any non cross-hnked graft copolymers (see text)... 

Ethylene vinyl acetate-vinyl chloride graft copolymer. See EVA/PVC graft polymer Ethylene/vinyl alcohol copolymer CAS 25067-34-9... 

For first-stage PS radicals formed in reactive S/ether system, the addition of methacrylic acid will result in the formation of S-block-(S-stat-MAA) copolymer, which could still possess amphiphilic properties. Also, such a block copolymer can be a good intermediate material for the formation of block-graft copolymers (see Section 4.6). 

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