Preparation of Polyrotaxane Cross-linking Agent with “Pulley” Effect and Its Potential Application in Swelling Grain Used as Profile Control and Water Plugging Agent†

doi:10.7503/cjcu20170856

Abstract

Abstract:

A kind of polyrotaxane with polymerizable double bonds was designed and prepared through three step reactions. Because the α-cyclodextrin can slide freely on the chain of polyvinyl alcohol, this polyrotaxane can be considered as a cross-linking agent with “pulley” effect. The structure of polyrotaxane was characterized by Fourier transform infrared spectrophotometer(FTIR), 2D nuclear magnetic resonance(NMR), X-ray diffraction(XRD), and so on. The swelling grains were prepared by copolymerization of acrylamide with novel polyrotaxane cross-linking agent and ordinary cross-linking agent N,N'-methylenebisacrylamide individually. The swelling ability and deformability of swelling grains were also investigated. After swelling for 51 h, for swelling grain prepared by novel polyrotaxane cross-linker, the water absorption is 8.32. The swelling grain is not broken and can restore the original state after receiving and with drawing 294.3 N external force. But for swelling grain prepared by ordinary cross-linker, the water absorption is 6.75. The swelling grain is broken after receiving 112.4 N external force. The swelling ability and deformability of swelling grain prepared by the polyrotaxane cross-linking agent are better than those of grain prepared by the ordinary chemical cross-linking agent.

Key words: “Pulley” effect;, Polyrotaxane cross-linking agent, Swelling grain, Profile control and water plugging agent, Swelling ability, α-Cyclodextrin

CLC Number:

O631.1

TrendMD:

TIAN Yao,ZHANG Chunquan,WANG Wenzhe,ZHOU Yingfang,LU Yitong,ZHANG Peng,JIA Zhenfu,ZHOU Chengyu,CHEN Shilan. Preparation of Polyrotaxane Cross-linking Agent with “Pulley” Effect and Its Potential Application in Swelling Grain Used as Profile Control and Water Plugging Agent^†[J]. Chem. J. Chinese Universities, 2018, 39(9): 2098.

Figures/Tables 14

Scheme 1 Modification process of allyl-α-CD

Scheme 2 Oxidisation process of PEG

Scheme 3 Preparation process of the polyrotaxane as a cross-linking agent

Fig.1 FTIR spectra of α-CD(a) and allyl-α-CD(b)

Fig.2 1H NMR spectra of α-CD(a) and allyl- α-CD(b) with DMSO-d6 as solvent

Fig.3 FTIR spectra of PEG(a) and HOOC-PEG-COOH(b)

Fig.4 1H NMR spectra of PEG(a) and HOOC- PEG-COOH(b, c) a, b. DMSO-d6 as solvent; c. D2O as solvent.

Fig.5 FTIR spectra of allyl-α-CD(a), HOOC-PEG-COOH(b) and polyrotaxane cross-linking agent(c)

Fig.6 1H NMR spectra of polyrotaxane cross-linking agent(a), HOOC-PEG-COOH(b) and allyl-α-CD(c) with DMSO-d6 as solvent

Fig.7 XRD patterns of allyl-α-CD(a), HOOC-PEG-COOH(b), the physical mixture of allyl-α-CD and HOOC-PEG-COOH(c), polyrotaxane cross-linking agent(d)

Fig.8 Partial 2D NOESY 1H NMR spectrum of polyrotaxane cross-linking agent with DMSO-d6 as solvent

Fig.9 Water absorption of novel swelling grain(a) and traditional swelling grain(b)

Fig.10 Deformability of traditional swelling grain

Fig.11 Deformability of novel swelling grain

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