Molecular weight averages sulfone

Materials. The starting PP was kindly provided by the Goodyear Tire and Rubber Company. It contains 82% trans and 17% cis double bonds with fewer than 1% vinyl side groups. The molecular weight averages are Mw = 172,000 and = 470,000. The PP was sulfonated using a 1 1 complex of sulfur trioxide with triethyl phosphate in chloroform at room temperature. The sulfonated material was neutralized by precipitating the reaction mixture into a 0.25M solution of NaOH in ethanol. This reaction is described in detail elsewhere (5) and is summarized as follows ... 

An amine-terminated polyoxyalkylene having an average molecular weight from about 600 to about 10,000 can be acylated with a succinic acylating agent (e.g., hexadecenyl succinic anhydride or a Diels-Alder diacid) obtained from an unsaturated fatty acid [628,629] similarly, alkyl-aryl sulfonate salts [1319] can be used in lubrication. 

Nadimide-terminated polysulfones (norbornene-terminated), as shown in Eq. 7 where the linear sulfone segment had a number average molecular weight (Mn) of 20,000g/mole were first reported in 1980 (18). This work was performed in an attempt to develop a tough solvent resistant resin for use in composites. The thermally induced reaction of the nadimide terminal groups involves a... 

Experiments indicate that the critical strain-to-failure is also affected by the average molecular weight and by material processing history. McGrath40 reported strain-to-break of a non-crystalline ionomer (a poly(arylene-ether) random copolymer, biphenyl sulfone in H form, or bi-phenyl sulfone in H form (BPSH)) is proportional to the length of the chain. We found in our laboratory that the casting procedure also affects the strain-to-break of the solution-cast ionomer film. As shown in Fig. 19, a Nation film cast at near room... 

Apparent Weight-Averaged Molecular Weight, kDa (Polystyrene-Sulfonate Scale)... 

Figure 13.4. Apparent MWs of HS from different environments as determined by SEC [compiled from the data reported by Perminova et al. (2003)]. Bars represent a range of weight-averaged molecular weights determined for different groups of humic materials. Two black dots represent two IHSS standards Suwannee River FA and HA. SEC chromatograms were obtained with column-packing Toyopearl HW-50S using 0.028 M phosphate buffer at pH 6.8 as a mobile phase. Two different sets of standards were used to calibrate the column polystyrene sulfonates (PSS) and polydextrans the upper MW scale corresponds to dextran calibration and the bottom one—to PSS calibration.

TABLE 1. The effect of sulfone/fluorene copolymer composition on the glass transition temperature and number average molecular weight. 

Figure 11.8 The steady-state viscosity for solutions of poly(l,4-phenylene-2,6-benzobisthiazole) (PBZT) with viscosity-averaged molecular weight 37,400 (molecular length 170 nm), in methane sulfonic acid at concentrations of 1.5 ( ), 2.52(H), 3.0(A), 3.43(0), 6.11(0). 8.2(Q)% (by...

Sulfonic acid and carboxylic acid resins have also been equilibrated with a series of quaternary ammonium ions of different molecular weights to measure the average pore size when these resins have increasing degrees of cross-linking. These results are shown in Figs. 13 and 14. 

The sodium polystyrene sulfonate, average molecular weight approximately 50,000 and 500,000 (Versa-Tl-50 and 500, respectively), was kindly donated by the National Starch and Chemical Corporation. It was prepared for use as described in an earlier paper (7). The standard NaOH was Fisher Certified Reagent. 

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