1‐chlorobutadiene–butadiene rubber. III. Determination of hydroxyl group content

Yamashita, Shinzo; Sando, Katsumi; Kohjiya, Shinzo

doi:10.1002/app.1979.070230706

Cited by 13 publications

(3 citation statements)

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“…The copolymer of 1-chloro-1 ,3-butadiene (CB) and 1,3-butadiene (Bd) contains active chlorines which enable it to undergo various chemical modifications. 1 -3 These chlorines were estimated to be in I ,4-configurational CB units, 3 as was also the case in CB-styrene (St) copolymer. 4 • 5 Thus, CB copolymers are regarded as functional polymers, and their reactivities are considered interpretable from their chemical structure determined by monomer reactivity ratios (MRR), conversions, and the microstructure of CB units.…”

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confidence: 74%

1-Chloro-1,3-butadiene Copolymers IV. Bulk Copolymerization of 1-Chloro-1,3-butadiene with Styrene

Kohjiya

Kurokawa

Iwata

et al. 1985

Polym J

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In the bulk copolymerization of 1-chloro-1,3-butadiene (CB) and styrene (St) at 70°C, the copolymerization rate, monomer reactivity ratio (MRR), and elementary reactions governing the molecular weight of the copolymer were studied. The rate of St polymerization decreased drastically by the addition of a small amount of CB, suggesting a predominant crossover termination, (k,,,). MRRs found: rc8 =1.680 and r5,=0.274, hence Q=l.80 and e=0.081 for CB. The molecular weight of copolymer and its polydispersity decreased with an increase in CB concentration, which is interpreted by a large k, 12 value. When the CB concentration becomes large, termination between CB polymer radicals may also become important. KEY WORDS Copolymerization I Monomer Reactivity Ratios Termination I Molecular Weight I Molecular Weight Distribution I 1-Chloro-1 ,3-butadiene I Styrene I

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confidence: 74%

1-Chloro-1,3-butadiene Copolymers IV. Bulk Copolymerization of 1-Chloro-1,3-butadiene with Styrene

Kohjiya

Kurokawa

Iwata

et al. 1985

Polym J

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“…Thus, the content of phenylurethane groups in a l-chlorobutadiene-butadiene copolymer [93] equivalent to HG quantity was photometrically determined in cyclohexane solution a t 234 nm. Review mination in polymers.…”

Section: Physico-chemical Methodsmentioning

confidence: 99%

Determination of hydroxyl groups in polymers. Review

Boiko¹,

Grischenko²

1985

Acta Polymerica

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The analysis of hydroxyl groups in polymers is reviewed. Recent achievements of chemical, physico-chemical and physical methods for the determination of hydroxyl groups and their differentiation by reactivity have been examined. Particularly, infrared spectroscopy and nuclear magnetic resonance used for this determination are considered. Die Bestimmung yon Hydroxylgruppen in Polymeren. FortschrittsberichtIn dem Bericht werden neuere Entwicklungen chemischer, physikalisch-chemischer und physikalischer Methoden zur Bestimmung von Hydroxylgruppen und ihrer Differenzierung hinsichtlich der Reaktivitat dargestellt. Insbesondere wird die Anwendung der Infrarotspektroskopie und der magnetischen Kernresonanz behandelt. Onpeaenenue zur3powuJabnwx zpynn 8 nom.wepax. O630p 0 6 3 0~ IIOCBfiQeH aHaJIH8y rHAPOKCHnbHhIX rpynn B IIOJIEiMepaX. PaCCMOTpeHbI IlOCJIeAHlle AOCTEiXeHllfi XHMH9eCKHX, @H3HHO-XHMH9eCHHX Ei @H3H4eCKHX MeTOAOB KOJIEi9eCTBeHHOrO OIIpeAeneHElH I' HApOKCHJIbHbIX I'pyIIII H HX AH@-@epeHqEi~EiEinOpeaKqHOHHOltCnOCO6HOCTH. ~C O 6 O~B H l l M~H H~~~~j I~H O H H @~~K~~C H O~C I I~K T~O C MarHHTHOMY pe30HaHCy. Chemical methods of analysisChemical methods a r e simple a n d accessible, t h e y do not require special equipment a n d expensive instruments. At t h e same t i m e t h e y a r e rather time-consuming a n d require considerable amounts of t h e substance t o be analyzed. These methods can mainly give quantitative information. If t h e differentiation of HG is necessary, they become much more time-consuming. Recently t h e effective methods of chemical analysis have appeared which enable HG t o b e determined rapidly a n d exactly enough. Acylation of HG is most widely used, its application for polymers is detailed in t h e handbooks o n polymer analysis. The classical acylation procedure [27, 281 uses acetic (AA) or phthalic anhydride (PA) in pyridine solution, t h e latter being t h e solvent and catalyst of t h e reaction. T h e use of propionic [29], succinic [30--321, nitrobenzoic [33], osulfobenzoic [34], nitrophthalic [35]anhydrides for t h e same purpose is described. As a rule, primary a n d secondary HG a r e fully acylated within 1 t o 2 h a t 100 t o 115°C. Pyromellitic dianhydride (PMDA) [36-381 is more effective. It has as high activity as AA a n d does not interact with aldehyde groups a n d phenolic HG which is characteristic of PA. Dimethylsulfoxide (DMSO) is especially recommended as a solvent [37].T o acylate HG, more active acyl chlorides can b e used. BOIKO and GRISHCHENKO:Deterinination of liydroryl groups in polymers. Review Acta Polymcrica 36 (1985) Nr. 9

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“…Hydroxyl group content in polymers has been determined by conversion to the phenyl carbamate by reaction with phenyl isocyanate and the derivative concentration measured by high-performance liquid chromatography (8) or by ultraviolet spectroscopy (96).…”

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confidence: 99%