Maleic anhydride content

Other analytical techniques ate also available for the determination of maleic anhydride sample purity. For example, maleic anhydride content can be determined by reacting it with a known excess of aniline [62-53-3] in an alcohol mixture (170). The solution is then titrated with an acid to determine the amount of unconsumed aniline. This number is then used to calculate the amount of maleic anhydride reacted and thus its concentration. Another method of a similar type has also been reported (171). 

Hypalon CP 826. This is a chloriaated, maleic anhydride modified polypropylene having a chlorine content of about 25% and maleic anhydride content of about 0.8%, developed to promote adhesion of inks and coatiags to polypropyleae or bleads containing polypropyleae. It has a solutioa viscosity of 125 mPas(= cP) at 20% soHds ia xyleae and can be used ia dilute solutioas as a wash primer or a tie layer betweea materials that are difficult to adhere. CP 827 is a higher molecular-weight analogue with a solution viscosity of 280 mPas(= cP) at 20% soHds ia 80/20 xylene/methyl isobutyl ketoae. 

Table 22.4 Properties which can be adjusted in the 1st stage of the PEER polymer synthesis by varying the maleic anhydride content to change the cross-link density0...

Average copolymer compositions of SAN samples were determined by elemental analysis, yielding weight percent acrylonitrile in the polymer. Compositions of S/MA and S/MA/MM were determined by sequential hydrolysis and pyridine titration to obtain maleic anhydride content and by infrared analysis for methyl methacrylate content. 

The GPC/DRI/FTIR instrument is complementary to the UV detector for compositional distribution. It runs at 135°C in TCB and can be used for EP analysis. Typical applications include ethylene content as a function of molecular weight, maleic anhydride content in maleated EP, or PCL content in caprolactone-g-EP copolymers. The FTIR detector is off-line so that 5-10 fractions of the eluant are collected on KBr plates and analyzed. This procedure gives calibration of IR absorption bands. This method is much more labor intensive than the other techniques and should be used with discretion. 

Title Polypropylene Having a High Maleic Anhydride Content... 

A reactor was charged with polypropylene containing an ene terminus (250 g), and the temperature was increased and maintained at 185°C. This material was then treated with maleic anhydride (20 g) dissolved in 24 ml of acetone followed by the dropwise addition of di-t-butyl peroxide (6 g). The reaction was maintained at this temperamre for 3 hours and then gradually cooled over 60 minutes. The product was isolated having an 11.3% maleic anhydride content. 

Entry Polypropylene-ene Copmponent Final Maleic Anhydride Content (wt%)... 

Figure I. Effect of maleic anhydride content on distortion temperature under load (DTUL) and on glass transition temperature (Tg). Key o, Si MA copolymer and a. Si MAI MM terpolymer (ca. 6% MM).

The effect of the maleic anhydride content in the copolymerization reaction mixture on the degree of carboxylation is illustrated by the data in Table I. Carboxylation of kraft lignin and ligninsulfonates may easily reach levels of 0.7 to 0.8 maleic anhydride units per lignin-building Cg-unit, if the lignin to maleic anhydride ratio in the reactor increases to 2 1. 

Table IV. Effect of Maleic Anhydride Content on Water Swell of PVA Hydrogels ...

Polypropylene (PP500P, SABIC) has melt flow rate of 3.1 (2.16 kg at 230 °C) and density of 905 kg/m3 was used as matrix resin. Nano-sized synthetic ultrafine surface treated precipitated calcium carbonate (Socal 312, Solvay, France) with mean particle diameter of 70 nm used as filler phase. PP-g-MAH compatibiliser (Priex 20097, Solvay, France) with a maleic anhydride content of 0.05 wt % and MFI of 15 (2.16 kg at 230 °C) was employed to promote the interfacial interaction between nano-CaC03 and PP, and to extend the dispersion of nanoparticles in polymer matrix. Compounds used as processing materials are listed in the table 1. 

These relationships were applied to the maleic anhydride content, ranging from 5 to 50mol%, and the range was 2 x 10" to 7 x 10. ... 

Figure 5.23 MS of the composites as a function of maleic anhydride content...

OH and COOH end groups, higher content of 1,2-bonds 8% epoxy groups, 10% maleic anhydride content Oxidized hydrocarbons Liquid Liquid... 

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