INVESTIGATION OF DIELECTRIC PROPERTIES OF BACTERIAL CELLULOSE-THERMOSET RESIN NANOBIOCOMPOSITE

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SHEYKHNAZARI S.; TABARSA T.; MASHKOR M.; KHAZAEIAN A.GH.

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Journal: Journal of Wood and Forest Science and Technology Year:2017 | Volume:24 | Issue:2 Page(s): 157-170

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Title

INVESTIGATION OF DIELECTRIC PROPERTIES OF BACTERIAL CELLULOSE-THERMOSET RESIN NANOBIOCOMPOSITE

Author(s)

SHEYKHNAZARI S. | TABARSA T. | MASHKOR M. | KHAZAEIAN A.GH. | Issue Writer Certificate

Keywords

BACTERIAL CELLULOSEQ1

KRAFT PULPQ2

THERMOSET RESINQ1

COMPOSITEQ1

Abstract

Background and objective: Cellulose is the most abundant polymer on earth and has enormous industrial importance. One of the common applications for native cellulose is using as an electrical insulator. The main hurdle of cellulose as application in electrical insulators is porosity and hygroscopicity of paper. Thus to remove humidity from pores, paper is impregnated by oil or resins. The aim of this research is using of bacteria to produce cellulose and preparation insulator COMPOSITE and paper from BACTERIAL CELLULOSE. The other purpose is comparison physical properties them with COMPOSITE and paper produced from KRAFT PULP.Material and Methods: The organism used was Gluconacetobacter xylinus (BPR 2004) which was purchased from IROST, Iran. KRAFT PULP was prepared from a factory of Mazandaran wood and paper. G. xylinus was incubated in a static Hestrin-Schramm culture at 28oc For 30 days.The obtained BC pellicles had 10mm thick. Then, BC pellicles purified and washed by deionized water. The pellicles were cut into small pieces and disintegrated by blender and standard pulp-disintegrator in lab. Aqueous suspension of KRAFT PULP was prepared. The content of BACTERIAL CELLULOSE that was added to suspension, was as follows: %5, 10 % and 15%. To prepare hand sheets of KRAFT PULP and KRAFT PULP- BC was used from the hand sheet maker. BC sheets were prepared from disintegrated BC by vacuum method. The handsheets were dried in the oven then conditioned. Basis weight of hand sheets was considered 60g/m2. Dried handsheets were immersed in phenolic resin (PF). To obtain COMPOSITEs, 5 immersed handsheets from every treatment layup and hot pressed at 150oc and 100Mpa for 10min. Then obtained samples were conditioned.Findings: To investigate of physical properties of samples was used from DP, XRD, FTIR, FESEM tests and also insulation tests composed of Loss tangent, capacitance, dielectric constant and break down voltage was used. The result showed the degree of polymerization (DP) BACTERIAL CELLULOSE was upper than KRAFT PULP. The result of X-ray diffraction indicated, crystallinity and crystalline size of BACTERIAL CELLULOSE was upper that KRAFT PULP. Air penetration test in hand sheets demonstrates thatwith increasing BACTERIAL CELLULOSE decrease porosity and the air couldn’t penetrate in handsheet. Kraft paper showed most air penetration and also most porosity. FE-SEM images showed morphology and structure of samples. Findings of FTIR demonstrate the interaction between reinforcement and matrix in COMPOSITEs. Dielectric properties were measured as loss tangent, capacitance, dielectric constant and breakdown voltage. The results showed BC and kraft paper had minimum and maximum loss tangent in order and this is conversely in its COMPOSITE. With increasing of BACTERIAL CELLULOSE from 5-15%, loss tangent increased in hand sheets and its COMPOSITEs. Capacitance and dielectric constant showed the similar trend to loss tangent. The breakdown voltage of hand sheets and COMPOSITEs increased with enhancement of BACTERIAL CELLULOSE.Conclusion: The results showed; crystallinity, crystal size and degree of polymerization of BACTERIAL CELLULOSE were upper than KRAFT PULP. Furthermore, hand sheets of BACTERIAL CELLULOSE had lower dielectric loss factor, dielectric constant, Capacitance. However, dielectric breakdown voltage of BACTERIAL CELLULOSE handsheets was upper.

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APA: Copy

SHEYKHNAZARI, S., TABARSA, T., MASHKOR, M., & KHAZAEIAN, A.GH.. (2017). INVESTIGATION OF DIELECTRIC PROPERTIES OF BACTERIAL CELLULOSE-THERMOSET RESIN NANOBIOCOMPOSITE. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, 24(2), 157-170. SID. https://sid.ir/paper/156627/en

Vancouver: Copy

SHEYKHNAZARI S., TABARSA T., MASHKOR M., KHAZAEIAN A.GH.. INVESTIGATION OF DIELECTRIC PROPERTIES OF BACTERIAL CELLULOSE-THERMOSET RESIN NANOBIOCOMPOSITE. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY[Internet]. 2017;24(2):157-170. Available from: https://sid.ir/paper/156627/en

IEEE: Copy

S. SHEYKHNAZARI, T. TABARSA, M. MASHKOR, and A.GH. KHAZAEIAN, “INVESTIGATION OF DIELECTRIC PROPERTIES OF BACTERIAL CELLULOSE-THERMOSET RESIN NANOBIOCOMPOSITE,” JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, vol. 24, no. 2, pp. 157–170, 2017, [Online]. Available: https://sid.ir/paper/156627/en

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