Improvement of polymer blend properties by changing sequence of mixing

Maji, Ruma; Bhattacharyya, Somak; Dasgupta, Sudip; Bandyopadhyay, S.; Mukhopadhyay, R.; Deuri, A. S.

doi:10.1002/app.25832

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…C-C and C-O stretching vibration also remained almost unchanged in the spectra of LO-loaded microcapsules. [71] No generation of new chemical bonds was evidenced by no specific peak value found between spectra of microcapsules and wall materials. This further confirms the formation of complexes promoted by physical interaction such as electrostatic interaction rather than chemical reactions.…”

Section: Fourier Transform Infrared Analysis Of the Microcapsulesmentioning

confidence: 99%

Production and characterization of multinuclear microcapsules encapsulating lavender oil by complex coacervation

Xiao

Liu

Zhu

et al. 2013

Flavour & Fragrance J

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The aim of this work was to encapsulate lavender oil by complex coacervation using gelatin and gum Arabic as encapsulants. The effects of various factors including pH value, the core/wall ratio, wall material concentration, stirring speed, cross‐linkers and homogenization rate on the appearance, mean particle size, yield, loading capacity (LC) and encapsulation efficiency (EE) were investigated. The optimal conditions (pH 3.5, core/wall 3:2, wall material concentration 1%, stirring speed 450 rpm, homogenization rate 19 000 rpm and glutaraldehyde as cross‐linker) for preparing spherical multinuclear microcapsules were obtained. At the optimal conditions, the highest yield is 65.8 ± 1.0%; the maximum LC is 61.3 ± 0.7%; the highest EE is 66.0 ± 0.3%. The effect of three different cross‐linkers on the hardening effectiveness of multinuclear microcapsules containing lavender oil was investigated. Glutaraldehyde and transglutaminase exhibit similar microcapsule hardening effectiveness. When tannic acid was used instead of glutaraldehyde and transglutaminase, the mean particle size and EE remained the same as that when hardening with glutaraldehyde or transglutaminase, but the morphology obviously changes, while the yield and LC significantly decrease. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Fourier Transform Infrared Analysis Of the Microcapsulesmentioning

confidence: 99%

Production and characterization of multinuclear microcapsules encapsulating lavender oil by complex coacervation

Xiao

Liu

Zhu

et al. 2013

Flavour & Fragrance J

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“…19,20 Improving the covulcanization of individual components is very important for rubber/rubber blending technology. 21 Much pioneering work had been done by changing processing methods, [22][23][24] accelerator grafted graphene to narrow the crosslinking rate gap, 20 reactive compatibilizers and cocuring agents, in situ polymerization curing agents. 25,26 Furthermore from the viewpoint of materials technology, the static and dynamic mechanical properties play the most essential role.…”

Section: Introductionmentioning

confidence: 99%

Improved covulcanization and dynamic properties of millable polyurethane elastomer/natural rubber blends: Thermal pretreatment

Cen

2023

J of Applied Polymer Sci

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Millable polyurethane elastomer (MPU) with polytetramethylene etherglycol as the soft segment, 4,4 0 -diphenylmethane diisocyanate extended with 3-Allyloxy-1,2-propanediol as the hard segment, was synthesized. The vulcanization characteristic showed that MPU compounds and natural rubber (NR) compounds presented a mismatch in curing rates under the acceleratorsulfur vulcanization system, with the former showing slower curing rates than the latter regardless of the curing temperature. A feasible thermal pretreatment process was thus used to modify the MPU compounds. The IR spectra showed that the peak intensity ratios of 1460-1600 cm À1 increased with increasing pretreated time, indicating the enhanced reactivity of the pretreated compounds (PMPU). Vulcanization kinetic results further confirmed that the pretreatment process facilitated the curing reaction, as the activation energies of the PMPU compounds were all reduced during the induction period, with the lowest value obtained for the sample pretreated for 2 min (PMPU2). PMPU2 was subsequently mixed with NR in various ratios and compared with the corresponding MPU/NR blend. Here improved covulcanization characteristics were observed for the PMPU/NR blends, which exhibited faster cure rates and higher crosslink density. In addition, higher mechanical properties were presented for these pretreated blends, with the tensile strength of PMPU2/NR vulcanizates increasing by 57.3%, 153.7%, and 49.1% when the blend ratios were 75/25, 50/50, and 25/75, respectively. In particular, the 75/25 PMPU/NR vulcanizate had excellent abrasion resistance comparable to MPU.The dynamic compression performance of the pretreated blends was also improved, with fatigue life and temperature rise increasing by 119.1% and decreasing by 40.5%, respectively, for the 75/25 PMPU2/NR vulcanizate relative to the reference MPU/NR. The DMA data showed that the blend vulcanizates exhibited lower tanδ at 60 C compared with the MPU vulcanizate, and this value was further reduced for the pretreated blend, which has obvious environmental significance in terms of reduced energy consumption.

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Effect of ABS Rubber Content on the Localization of MWCNTs in PC/ABS Blends and Electrical Resistivity of the Composites

Sun

Guo

2010

Macro Materials & Eng

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Three types of acrylonitrile‐butadiene‐styrene rubbers with different rubber contents were used in the preparation of PC/ABS/MWCNT composites. It was found that localization of MWCNTs changes from PC to ABS phase when rubber content of ABS varies from 5 to 60%. This is discussed by a combination of thermodynamics and kinetics. Melting sequence and high viscosity of ABS are used to explain the localization of MWCNTs in the high viscosity ABS phase. The relationship between the localization of MWCNTs and the electrical resistivity of the composite is also investigated.magnified image

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Improvement of polymer blend properties by changing sequence of mixing

Cited by 4 publications

References 15 publications

Production and characterization of multinuclear microcapsules encapsulating lavender oil by complex coacervation

Production and characterization of multinuclear microcapsules encapsulating lavender oil by complex coacervation

Improved covulcanization and dynamic properties of millable polyurethane elastomer/natural rubber blends: Thermal pretreatment

Effect of ABS Rubber Content on the Localization of MWCNTs in PC/ABS Blends and Electrical Resistivity of the Composites

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