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Preparation and Properties of Polypropylene Composites with High Thermal Conductivity Fillers by Melt Compounding
http://hdl.handle.net/10098/8202
http://hdl.handle.net/10098/820271108e74-b5a9-467b-929d-0ecdba81683e
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Part_3_CH_1_to_5_Knowledgement.pdf (4.7 MB)
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BD00002952_001.pdf (148.1 kB)
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Part_1_Covers.pdf (58.5 kB)
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Part_2_Content.pdf (129.7 kB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2014-03-25 | |||||
| タイトル | ||||||
| タイトル | Preparation and Properties of Polypropylene Composites with High Thermal Conductivity Fillers by Melt Compounding | |||||
| タイトル | ||||||
| タイトル | 溶融混練による高熱伝導フィラーを用いたポリプロピレン複合体の作製と物性 | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||
| 資源タイプ | doctoral thesis | |||||
| アクセス権 | ||||||
| アクセス権 | open access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
| 著者 |
Cheewawuttipong, Watthanaphon
× Cheewawuttipong, Watthanaphon |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The purpose of this study was to improve thermal conductivity and other properties of polymer composites filled with high thermal conductivity filler. Polymer composites were prepared by melt compounding. Two types of high thermal conductivity material were used: Boron nitride (BN) and Vapor-grown carbon fiber (VGCF). Polypropylene (PP) was used as polymer matrices. This thesis was to investigate the relationship between polymer matrix, filler, and properties of composites. Also studied was the effect of the surface modification on developing the dispersibility of filler in composites. PP composites loading various sizes of BN particles were studied. Thermal conductivity of PP composites with medium-sized BN particles was higher than those with large and small BN particles; in each case, because of the medium-sized BN particles, good dispersion and good connection with other particles occurred without aggregated BN particles in composites. Increasing of BN content enhanced the network structure of filler in composites by reducing the distance between BN particles, leading to an increase in thermal conductivity of PP/BN composites. The melt viscosity of the PP matrix was an independent on the thermal conductivity of composites for various BN contents. In addition, PP composites with the medium and large-sized BN particles showed higher storage and loss moduli than PP composites with small BN particles. It could be concluded that the thermal conductivity, storage, and loss moduli of PP composites depended on the content and dispersibility of BN particles in PP matrices. Furthermore, various models were used to predict the thermal conductivity behavior of PP/BN composites. The BN particle combinations, two different sizes each and at various volume ratios, consisted of small/medium, small/large, and large/medium, filled in PP matrices for enhancing thermal conductivity of composites. The results showed that PP composites containing the combined two different sizes of BN particles could enhance thermal conductivity, relative to PP composites with a single size of BN at the same total content. The formation by combining two different sizes was significant to enhance the network structure in composites by reducing the distance between BN particles and was more densely packed, relative to PP composites loading a single size of BN particles. A PP composite containing 28 vol% combined fillers, with a mixture of large-sized and small- sized BN particles, at a volume ratio of 1: 4 showed the highest thermal conductivity in this experiment. PP composites containing three types of vapor-grown carbon fiber (VGCF) with various lengths, including short, medium, and long lengths of VGCF, were studied. The long length of VGCF was uniformly dispersed and showed good connection with other fibers in PP composites, compared to short and medium lengths of VGCF. In addition, the distance between VGCF fibers in PP matrices decreased with content of filler. It is noted that the network structure of the VGCF had an effect on improving thermal conductivity of PP/VGCF composites. The effects of filler content, dispersibility of single vs. hybrid BN/VGCF fillers were investigated with respect to the thermal conductivity of the PP composites. Hybrid fillers were created with a mixture of medium-sized BN and long-length VGCF. Results indicated that a PP composite containing 28.6 vol% hybrid fillers, with a mixture of 28 vol% BN and 0.6 vol% VGCF, showed higher thermal conductivity than PP composites with 33 vol% medium-sized BN. In addition, PP composites with a hybrid of 28 vol% BN and 2 vol% VGCF showed the highest thermal conductivity in this experiment. The results supported that the hybrid filler systems of BN/VGCF could enhance the thermal conductivity of PP composites with a lower content of filler compared to PP composites containing a medium size of BN particles. The electrical properties of PP composites with hybrid BN/VGCF varied with VGCF content. The effect of surface modification with a titanate coupling agent on the dispersibility of fillers in PP composites was investigated. The titanate coupling agent was treated on the surface of short-length VGCF and small-sized BN. The result indicated that treated short-length VGCF and treated small-sized BN were uniformly dispersed; the size of aggregated fillers reduced and the distance between filler decreased relative to untreated fillers. In brief, a titanate coupling agent had an effect on improving the dispersibility of short-length VGCF and small-sized BN in PP matrices. The yield strength, Young's modulus, and loss modulus of PP composites with treated VGCF, were higher than untreated VGCF. This implies that a titanate coupling agent significantly increases the adhesion between filler and matrix which led to enhancing the dissipation force in composites. Furthermore, the surface modification by using a titanate coupling agent could enhance thermal conductivity.of PP composites containing a high content of filler. | |||||
| 学位名 | ||||||
| 学位名 | 博士(工学) | |||||
| 学位授与機関 | ||||||
| 学位授与機関識別子Scheme | kakenhi | |||||
| 学位授与機関識別子 | 13401 | |||||
| 学位授与機関名 | 福井大学 | |||||
| 学位授与年月日 | ||||||
| 学位授与年月日 | 2014-03-24 | |||||
| 学位授与番号 | ||||||
| 学位授与番号 | 工博甲第413号 | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
