POLYMERIZATION OF PHENOL FORMALDEHYDE IN SOLVENT-SATURATED VAPOR AND STUDY ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NOVOLAC AEROGEL PRODUCT

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NASERI IMAN; KAZEMI ALI; BAHRAMIAN AHMAD REZA; RAZZAGHI KASHANI MEHDI

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Journal: Iranian Journal of Polymer Science and Technology Year:2014 | Volume:26 | Issue:5 (ISSUE NO. 127) Page(s): 427-435

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Title

POLYMERIZATION OF PHENOL FORMALDEHYDE IN SOLVENT-SATURATED VAPOR AND STUDY ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NOVOLAC AEROGEL PRODUCT

Author(s)

NASERI IMAN | KAZEMI ALI | BAHRAMIAN AHMAD REZA | RAZZAGHI KASHANI MEHDI | Issue Writer Certificate

Keywords

NOVOLAC RESINQ1

AEROGELQ2

SATURATED ATMOSPHEREQ2

SHRINKAGEQ3

NANOSTRUCTUREQ2

Abstract

Aerogels consist of low density open-cell foams with large void spaces of nanometer pore size and they are composed of sparsely semi-colloidal nanometer sized particles forming open porous structures. The high porosity and nanometer pores and particles of AEROGELs have interesting properties such as low thermal conductivity and low sound transmission. The main disadvantages of conventional method for preparation of AEROGELs are high cost of resorcinol, long preparation time and high cost of supercritical drying device. The previous research showed that sol-gel polymerization lower than temperature of normal boiling point of solvent, and a 50oC difference in temperature between the novo lac resin synthesis and the temperature of curing novo lac resin is the main reason for long sol-gel polymerization time. A low temperature polymerization is used for prevention of solvent evaporation and foam blowing process. The objectives of this research were to reduce time and cost in the production process of organic AEROGELs. To reduce the cost of raw materials, the reaction of a low cost commercial novo lac resin and HMTA were used for preparation of the gel. To reduce gelation time, the polymerization was performed in an atmosphere of solvent saturated-vapor as a novel method to restrict sol-gel polymerization of curing novo lac resin at appropriate temperature. The investigation showed that the polymerization carried out in solvent-saturated vapor did help to reduce polymerization time to 5 h from 5 days duration in conventional reactions without any visible SHRINKAGE under ambient pressure and temperature. Furthermore, the compressive strength increased by one order of magnitude besides other achievements.

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APA: Copy

NASERI, IMAN, KAZEMI, ALI, BAHRAMIAN, AHMAD REZA, & RAZZAGHI KASHANI, MEHDI. (2014). POLYMERIZATION OF PHENOL FORMALDEHYDE IN SOLVENT-SATURATED VAPOR AND STUDY ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NOVOLAC AEROGEL PRODUCT. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), 26(5 (ISSUE NO. 127)), 427-435. SID. https://sid.ir/paper/401338/en

Vancouver: Copy

NASERI IMAN, KAZEMI ALI, BAHRAMIAN AHMAD REZA, RAZZAGHI KASHANI MEHDI. POLYMERIZATION OF PHENOL FORMALDEHYDE IN SOLVENT-SATURATED VAPOR AND STUDY ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NOVOLAC AEROGEL PRODUCT. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)[Internet]. 2014;26(5 (ISSUE NO. 127)):427-435. Available from: https://sid.ir/paper/401338/en

IEEE: Copy

IMAN NASERI, ALI KAZEMI, AHMAD REZA BAHRAMIAN, and MEHDI RAZZAGHI KASHANI, “POLYMERIZATION OF PHENOL FORMALDEHYDE IN SOLVENT-SATURATED VAPOR AND STUDY ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NOVOLAC AEROGEL PRODUCT,” IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), vol. 26, no. 5 (ISSUE NO. 127), pp. 427–435, 2014, [Online]. Available: https://sid.ir/paper/401338/en

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