The Effects of Creep-recovery Characteristics of Wall Material on Morphology of Microcapsule

Objective: To study the effects of creep-recovery characteristics of wall material on morphology of microcapsule. Methods: The preparation of the same consistency gum Arabic, carboxymethyl cellulose and gelatin wall paste were studies, observe the creep-recovery characteristics of wall materials under stress of 1, 6, 10, 20 Pa (gelatin in 500, 1000, 2000, 1000 Pa), research the effects of add maltodextrin on creep-recovery characteristics of wall material under the condition of 50℃ and morphology of microcapsule. Results: Creep curves were fitted to the Burgers model, fitting R2>0.91. Creep stress of 1, 6, 10 Pa, the carboxymethyl cellulose Jcmax increases with stress increases, the gum Arabic Jcmax decreases with stress increases, and when the stress is 20 Pa, gum Arabic, carboxymethyl cellulose section elastic structure damage, Jc0, Jc1, Jcmax significantly increases, μ0 and recovery rates falling rapidly. Creep stress of 500, 1000, 2000, 1000 Pa, the gelatin Jcmax, Jc0, Jc1 increases with stress increases and have corresponding reply in recovery phase; gum Arabic Jc0, Jc1, rc1 is reduced after adding the maltodextrin under the condition of 50℃, the μ0 increases from 25.38×103 Pa·S to 49.06×103 Pa·S, Jr0, Jr1, rr1 reduce obviously and response rates decline in recovery phase, the surface sag of the microcapsules have improved, carboxymethyl cellulose creep phase change is not obvious, while Jr0, Jr1, rc1 significantly increases, recovery rate from 30.01% to 61.59%, the surface depression of microcapsule is more serious, gelatin Jcmax, Jc0, Jc1, rc1 significantly increases in creep phase, μ0 from 292.86×103 Pa·S to 64.32×103 Pa·S, while Jr0 and Jr1 reduced obviously, recovery rate from 18.27% to 1.46%, the morphology of the microcapsules breakage rate is high. Conclusion: The morphology of microcapsules with gelatin as the wall material more smooth, because the gelatin recovery rate is low and can bear the bigger stress than the gum Arabic, carboxymethyl cellulose, but after adding maltodextrin, its elastic structure easy to damage, the microcapsule surface damaged seriously. The gelatin strength are enhanced after adding maltodextrin for gum Arabic, preparation of microcapsule surface sag improve obviously, carboxymethyl cellulose resilience enhancement, preparation of microcapsule surface sag is more serious. © 2017, Editorial Office of Journal of CIFST. All right reserved.