Narumon Seeponkai

Naresuan University, Materials Engineering, Department Member

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Papers by Narumon Seeponkai

Physical properties and ion permeability of crosslinking hydrogel membrane based on poly(vinyl alcohol) for soilless cultivation

Journal of Applied Polymer Science

Synthesis and analysis of semiconducting polymers for solar cell applications

$Research paper thumbnail of The Use of Aluminum Dross in Refractory Materials from the Recycling Process of Aluminum Alloys$

The Use of Aluminum Dross in Refractory Materials from the Recycling Process of Aluminum Alloys

The Journal of King Mongkut's University of Technology North Bangkok, 2021

งานวิจัยนี้เป็นการประยุกต์ใช้ตะกรันอะลูมิเนียม ซึ่งเป็นวัสดุเหลือทิ้งจากกระบวนการรีไซเคิลอะลูมิเน... more งานวิจัยนี้เป็นการประยุกต์ใช้ตะกรันอะลูมิเนียม ซึ่งเป็นวัสดุเหลือทิ้งจากกระบวนการรีไซเคิลอะลูมิเนียมผสม โดยมีวัตถุประสงค์หลัก คือการนำวัสดุเหลือทิ้งมาใช้ให้เกิดประโยชน์ จากการวิเคราะห์ตะกรันอะลูมิเนียมในเบื้องต้น ด้วยเทคนิคเอกซเรย์ดิฟแฟรกชัน และเทคนิคเอกซเรย์ฟลูออเรสเซนส์ พบว่าตะกรันอะลูมิเนียม มีสารประกอบ อะลูมินา ซึ่งเป็นองค์ประกอบหลักในการขึ้นรูปวัสดุทนไฟประเภทอะลูมินาสูง โดยมีอะลูมินาร้อยละ 81.6 และซิลิการ้อยละ 5.6 โดยน้ำหนัก จากนั้นนำตะกรันอะลูมิเนียมดังกล่าวมาผสมกับ อะลูมินา และซิลิกา เกรดอุตสาหกรรม ที่สัดส่วน 100: 0: 0, 80: 10: 10 และ 60: 20: 20 ตามลำดับ แล้วนำไปอัดขึ้นรูปที่กำลังอัด 4,000 ปอนด์ต่อตารางนิ้ว และเผาประสานที่อุณหภูมิ 1,300 1,350 และ 1,400 องศาเซลเซียส เป็นเวลา 2 ชั่วโมง แล้วทำการทดสอบสมบัติต่างๆ ได้แก่ ความ แข็งแรงอัด ความหนาแน่น และสัมประสิทธิ์การนำความร้อน จากผลการทดลองทั้งหมดสรุปได้ว่าสัดส่วนที่เหมาะสม ได้แก่ 80: 10: 10 เผาประสานที่อุณหภูมิ 1,300 องศาเซลเซียส โดยที่สัดส่วนดังกล่าวให้ค่าความแข็งแรงอัดเท่ากับ 54.3 เมกกะปาสคาล ค่าความหนาแน่นเท่ากับ 2.2 กรัมต่อลูกบาศก์เซนติเมตร และค่าสัมประสิทธิ์การนำความร้อนที่ 1.8 วัตต์ต่อเมตรเคลวิล ซึ่งค่าดังกล่าวนั้นอยู่ในช่วงที่เหมาะสมในการนำไปใช้ในงานเป็นวัสดุทนไฟประเภทอะลูมินาสูง ตามมาตรฐาน KB-50This research studies an application of aluminum dross, that is solid waste from aluminum alloys recycling process. The main objective of this study is to obtain the benefit from waste material utilization. Basically, alumina is the main composition for producing high alumina refractory. In this research the aluminum dross was studied the primary chemical composition by using XRD and XRF techniques in order to monitor the alumina composition from aluminum dross. It was found that alumina is the major chemical composition with 81.6 wt% followed by silica with 5.6 wt%. The aluminum dross was mixed with alumina and silica (industrial grade) by using the ratio of 100 : 0 : 0, 80 : 10 : 10 and 60 : 20 : 20, respectively. The mixing powder were compressed at 4,000 lb/in2 and then all samples were sintered at 1300, 1350 and 1,400 degrees Celsius for 2 hours. The compressive strength, bulk density and thermal conductivity coefficient were analyzed. It was found that the sample with the aluminum dross : alumina : silica at the ratio of 80 : 10 : 10 sintered at 1300 degrees Celsius provided the value of the compressive strength, bulk density and thermal conductivity coefficient of approximately 54.3 MPa, 2.2 g/cm3 and 1.8 W/m.K, respectively. These values show the sample with the ratio of 80 : 10 : 10 is suitable for using as high alumina refractories, referring to standard of KB-50 refractory materials

Development of Charcoal Briquette Produced from Small Fragments Charcoal of Thong Saen Khan Community Biomass Power Plant Using Solid Alcohol to Ignite and Combust Charcoal Briquette

Physical and Mechanical Properties of Poly(Butylene Succinate) and Poly(Lactic Acid) under Landfill Conditions

Key Engineering Materials

In this study, the disintegration of poly(butylene succinate)(PBS) and poly(lactic acid) (PLA) un... more In this study, the disintegration of poly(butylene succinate)(PBS) and poly(lactic acid) (PLA) under landfill conditions was investigated. Both polymers were melted, injected into a dumbbell-shape, and buried under the soil for 20 weeks. The morphology of the polymer from the scanning electron microscope (SEM) revealed that, after 6 weeks of the burial, the PBS polymer produced many micro-voids in the bulk of polymer. The amount of the voids increased with time. While the morphology of PLA showed a few voids and some cracks during the degradation process. Moreover, the mechanical properties of the PLA were decreased after 2 weeks following with PBS after 4 weeks of the burial times. The weight loss and the water uptake of PBS and PLA were slightly increased. From the result, it was found that the degradation of PBS and PLA proceeds via random chain scission of the ester bond through bulk erosion mechanism. The degradation of PLA degraded faster than the PBS due to the low crystallin...

Preparation of Dehydrochlorinated Poly(Vinyl Chloride) (Dhpvc) and Dhpvc Nanofibres: Effects of Reaction Time on Conductivity, Electrospinability, and Fibre Morphology

Polymers and Polymer Composites

This research work concerns the development of dehydrochlorinated poly(vinyl chloride) (DHPVC) an... more This research work concerns the development of dehydrochlorinated poly(vinyl chloride) (DHPVC) and DHPVC nanofibres for use as components in new generation solar cells. Firstly, DHPVC with a variety of degrees of dehydrochlorination was prepared at 70 °C. The primary aim of this work was to investigate the effects of reaction time (15–105 h) on the molecular structure and conductivity of the modified PVC. In addition, the feasibility of preparing DHPVC nanofibre web via an electrospinning process was also explored. The effects of electrospinning on the morphology and conductivity of the materials were also of interest. From the results, it was found that the degree of dehydrochlorination and electrical conductivity of DHPVC are interrelated and both increased linearly with the reaction time. After carrying out electrospinning using a DHPVC sample which had been subjected to 30 h reaction time (DHPVC-30h), a randomly oriented fibre web with a smoother fibre surface and free from beads was obtained. This was not the case for the electrospun PVC and DHPVC-15h fibres. The electrical conductivity values of the electrospun DHPVC were also higher than those of the dense DHPVC film analogues. This is ascribed to an enhanced molecular alignment and a greater conjugation length of the polymer induced by the electrospinning.

Synthesis of Donor-Acceptor Graft Copolymer Based on PPV and Fullerene Grafted Polystyrene for Solar Cell Applications

Publish Paper

The Effects of Sulfonated Graphene Oxides (sGO) on Ion Conductivity and Permeability of the Vanadium Redox Flow Batteries Membranes Based on Sulfonated Poly(Ether Ether Ketone) Composite

Applied Mechanics and Materials

Sulfonated graphene oxide (sGO) was used as a filler to enhance performance of sulfonated poly(et... more Sulfonated graphene oxide (sGO) was used as a filler to enhance performance of sulfonated poly(ether ether ketone)(sPEEK) membrane. The sGO was firstly prepared by treating graphene oxides (GO) with sulfanilic acid at 70 °C for 20 h. The sGO was characterized by FTIR and XPS techniques. Composite membranes of various amount of sGO were fabricated via solution casting method. The properties of composite membranes were investigated by measuring ion exchange capacity (IEC), water uptake, ion conductivity and vanadium ion permeability. From the results, it was found that the IEC and water uptake of the membranes increased after adding the sGO. Ion conductivity of the sPEEK membrane also increased from 8.94*10-3 Scm-1 to 10.55*10-3 Scm-1. Moreover, permeability of vanadyl sulfate (VOSO4) through the composite membranes were decreased. These composite membranes exhibit great potential for vanadium redox flow batteries application.

Synthesis of Graft Copolymers and Their Preliminary Use as a Compatibilizer in Polymer Solar Cells

by Sombat Thanawan and Narumon Seeponkai

International Journal of Polymeric Materials, 2014

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