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Separation of Polybutadiene Depending on Isomeric Stuructures by High Performance Liquid Chromatography

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Separation of Polybutadiene Depending on Isomeric Stuructures by High Performance Liquid Chromatography Polymer Journal, Vol. 23, No. 1, pp 23-27 (1991) Separation of Polybutadiene Depending on Isomeric Stuructures by High Performance Liquid Chromatography Hisaya SATO, Masato SASAKI, and Kenji OGINO Department of Material Systems Engineering, Faculty of Technology, Tokyo University of Agriculture and Technology, Koganei, Toky 184, Japan (Received July 30, 1990) ABSTRACT: Polybutadiene was separated by isomeric structure using high performance liquid chromatography. With reversed-phase mode using a cross-linked styrene gel as a stationary phase and a mixture of acetonitrile and dichloromethane as an eluent, the polymer was separated by phase separation mechanism. With a cross-linked acrylamide gel and a mixture of hexane and dichloromethane (normal phase), the samples were eluted in order of 1,2 (vinyl), cis-1,4, and trans-1,4 structure by adsorption mechanism. The resolution by adsorption mechanism was better than one by phase separation mechanism. If acrylonitrile gel was used as stationary phase in the normal phase, samples were adsorbed only weakly to the gel and the resolution was not good. KEY WORDS Polybutadiene / Isomeric Structure / High Performance Liquid Chromatography / Separation / Adsorption / Phase Separation / Recently, high performance liquid chroma­ During the solvent gradient of increasing the tograhy (HPLC) has been applied to determine good solvent content, samples were desorb­ the chemical composition distribution of co­ ed and eluted from molecules containing polymers or to separate steroisomers of poly­ lower amounts of methacrylate units. This (methyl methacrylate)s by utilizing solvent gra­ combination of mobile and stationary phases dient from poor or non solvent to a good is called a normal phase (NP) mode. solvent of the sample. 1 - 26 On the other hand, in a reversed-phase (RP) In the previous work we have investigated mode where a non-polar stationary phase and the separation of styrene-methyl methacrylate a polar and poor solvent were used, the copolymers depending on the styrene content opposite elution order was observed, although using a cross-linked polymer gel as a stationary the separation was done by an adsorption phase. 27 If both of the mobile and stationary mechanism. It was also found that the ad­ phases were either polar or nonpolar, polymer sorption mechanism provided smaller molec­ molecules have had little tendency to adsorb ular weight dependence and better resolu­ on the stationary phase. If initial eluent was tion for the broad molecular weight sample a non-solvent of samples and the solvent than the phase separation mechanism. In these gradient of increasing good solvent was experiments the polarity of the sample was applied, the samples were separated mainly by lower than the gel in case of NP and higher a precipitation-redissolution (phase separa­ than the gel in case of RP HPLC. tion) mechanism. If a polar stationary phase This article describes the separation of and non-polar and poor solvent were used, polybutadiene depending on isomeric structure samples adsorbed to the stationary phase even using NP and RP HPLC. This polymer is when the eluent started to dissolve them. interesting, because it is less polar than gels 23 H. SATO, M. SASAKI, and K. OGINO normally used for RP column, e.g., polystyrene Table I. Characteristics of polybutadiene or poly(octadecyl methacrylate) gels, and also the non-polar eluent used in HPLC is not a Isomeric units/% Sample M./104 Mw/104 Mw/M. poor solvent of it. And also the polarity cis trans 1,2 difference among the samples is very small. trans 7 89 4 5.6 14 2.5 cis 95 2 3 8.0 29 3.6 EXPERIMENTAL V-1 41 51 8 25 28 I.I V-2 25 30 45 20 22 I.I Polybutadienes were obtained from Japan V-3 7 8 85 25 27 I.I Synthetic Rubber Co., Ltd. The characteristics of the samples are listed in Table I. Packing trans materials for the HPLC columns were prepar­ cis ed by suspension or inverse suspension po­ lymerization as described elsewhere. 23•28 The obtained gels were packed into stainless steel a) column of 4.5 mm i.d. and 25 cm in length by slurry method. V2 Vl HPLC was carried out at room temperature (ca. 25°C) using two Jasco 880-PU pumps, for V3 providing a good solvent such as dichloro­ methane, 1-chloropentane, or carbon tetra­ chloride and the other, poor solvent such as acetonitrile or hexane. The two solvents were mixed together after pumping and were b) delivered to a Reodyne 7125 injector through 10 15 20 25 a filter. The flow rate was set at 0.5 ml min - i Elution Time. min. and the proportion of a good solvent was Figure 1. HPLC curves of mixtures of polybutadienes increased linearly in 25 min. A 10 µl portion of using styrene column and CH2Cl2/CH3CN (30: 70 to dichloromethane solution of the sample ( l 0 100: 0) eluent. mg ml - 1) was injected. The column effluent was monitored using an evaporative mass detector depending on the catalyst and other polym­ (Applied Chromatography Systems Co., Model erization conditions. Polybutadienes having 750/14) at neblizer gas pressure of 1.4 kgcm- 2 different isomeric units were separated by RP and at set temperature of 30°C. HPLC using cross-linked styrene or octadecyl Each peak of a mixture was assigned from methacrylate gel as a stationary phase and a the elution volume of an individual sample mixture of dichloromethane and acetonitrile as injection. an eluent. As shown in Figure la, a mixture The cloud point was visually determined by of cis-1,4 and trans-1,4 PBD showed two broad adding a poor solvent into a 1.0 mg ml - 1 peaks at ca. 16 and 22 min, respectively. Figure solution of polymer in dichloromethane at 1b shows a HPLC curve of polybutadiene 25°C. having different amount of 1,2 units, which were prepared by butyllithium catalyst. The RESULTS AND DISCUSSION sample eluted in the order of decreasing amount of 1,2 unit in the elution range from Butadiene was polymerized to yield three 18 to 23 min. The peaks of 1,2-polyburadienes isomeric units of cis-1,4, trans-1,4, and 1,2 units were narrower than those of 1,4-polybuta- 24 Polym. J., Vol. 23, No. 1, 1991 Separation of Polybutadiene by HPLC Table 11. Could point and CH2Cl2 content in eluent CH2 Cl 2 content in eluent/% Sample Colud point/%--------­ St column SMA column trans 69-75 67 69 V1 cis 76-80 75 74 vz V-1 76-79 75 73 VJ cis V-2 72-76 71 69 trans V-3 68-71 67 67 dienes, which may be due to the fact that the former has narrower molecular weight distribu­ tion than the latter and to the larger molecular weight dependence of elution volume. As mentioned later, the samples were separated by phase separation mechanism, which usually mixture provides larger molecular weight effect than 0 10 15 20 adsorption mechanism. 19•23 •24 Because the two Elution time, min. groups of polymers had a similar elution Figure 2. HPLC curves of polybutadienes using acryloni­ volume range, a mixture of cis-1,4, trans-1,4, trile column and CH2 Cl2/hexane (0: I 00 to JOO: 0) eluent. and l ,2-polybutadienes were not well sep­ arated. hexane eluent. When polyacrylonitrile (AN) gel As shown in Table II, the dichloromethane was used as a stationary phase, polymers were content at the peak top is almost equal to the eluted at the elution range of 12 to 15 min with cloud point for each polymer, which indicates the elution order of 1, 2, cis, and trans isomers. that the separation was done by the phase However, when a mixture of the five polymers separation mechanism. It is noteworthy that was injected, only two peaks were observed; the good solvent content of the eluent was one overlapping peak due to 1,2 and cis­ independent of the type of the gel, which is polymers and the other due to trans polymer characteristic to the phase separation mecha­ and shown in Figure 2. The poor resolution of nism. In the case of polybutadiene the polarity the mixture may be attributed to the weak of the sample is lower than the gel, and no absorption in this HPLC system. Therefore, it adsorption was observed. On the other hand, is considered that less polar eluent than hexane in the case of styrene-methyl methacrylate is necessary to separate polybutadienes by copolymer which is polar than the gel, the same adsorption mechanism, if AN gel is used as a chromatographic system provide the separa­ stationary phase. tion due to adsorption mechanism. Therefore, It was found that the adsorption became it can be said that polarity of the sample should stronger when a more polar gel was used in be higher than the gel by adsorption mechanism NP mode. 25•27 Polyacrylamide (AA) gel was in RP HPLC. Therefore, less polar stationary found to be more polar than AN gel, 28 since phase than those used in this study is thought a polymer having a higher solubility parameter to be necessary for the separation by ad­ (SP) value is generally more polar and the SP sorption mechanism. value of the former is 13 cal 112 cm - 312 and that Separation of isomeric polybutadienes was of the latter 11 cal112 cm- 312 • AA gel was used tried by NP mode using dichloromethane/ instead of AN gel with the same eluent. As Polym. J., Vol. 23, No. 1, 1991 25 H. SATO, M. SASAKI, and K. OGIN0 V3 V2 V1 cis trans 10 15 20 25 30 Elution Time.
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