桉木质素磺酸钙与接枝共聚引发剂反应导致的结构变化

doi:10.11707/j.1001-7488.20130720

Abstract

Abstract:

The grafting method is widely adopted for developing lignin-based polymer materials with high properties. Aimed at studying various initiators (Fenton, K₂S₂O₈, H₂O₂-CaCl₂) effects on calcium lignosulfonate from eucalyptus (HLS-Ca) in graft copolymerization, HLS-Ca was treated by the above initiators, respectively. Changes in the functional composition of HLS-Ca were investigated by using Difference UV, FTIR, UV spectroscopy and intrinsic viscosity ([η]) methods. The results show that the changes in the structure and reactivity of HLS-Ca were observed due to some certain reactions between it and initiators. Under our experimental conditions, the benzene ring stable against the oxidation of Fenton and K₂S₂O₈ initiators; the content of phenolic hydroxyl (Ph-OH) group decreases under the incubation of Fenton and K₂S₂O₈ initiators though it's not oxidized to the structure like quinone; the content of aryl-ether,[η] and viscosity-average molecular weight (Wη) increase. Under the treatment of H₂O₂-CaCl₂ initiator, the content of Ph-OH group decreases dramatically and it could be transformed to carbonyl structure. The destruction of benzene ring results in the decrease in the [η] and Wη for HLS-Ca.

Key words: initiator, calcium lignosulfonate from eucalyptus, phenolic hydroxyl group, benzene ring, viscosity-average molecular weight

CLC Number:

TQ351.01⁺3

Gan Lingling, Ye Dezhan, Li Qiling, Zhang Minghua, Zhang Xi. Changes in Calcium Lignosulfonate from Eucalyptus Influenced by Initiators in Graft Copolymerization[J]. Scientia Silvae Sinicae, 2013, 49(7): 136-142.

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Changes in Calcium Lignosulfonate from Eucalyptus Influenced by Initiators in Graft Copolymerization

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