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  • 1
    In: Cellulose, Springer Science and Business Media LLC, Vol. 30, No. 14 ( 2023-09), p. 8571-8593
    Type of Medium: Online Resource
    ISSN: 0969-0239 , 1572-882X
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 1496831-9
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  • 2
    Online Resource
    Online Resource
    Universitas Gadjah Mada ; 2014
    In:  Jurnal Ilmu Kehutanan Vol. 6, No. 1 ( 2014-01-29), p. 61-
    In: Jurnal Ilmu Kehutanan, Universitas Gadjah Mada, Vol. 6, No. 1 ( 2014-01-29), p. 61-
    Abstract: Papan partikel tanpa perekat sintesis atau binderlessboard merupakan alternatif produk ramah lingkungan yang potensial dikembangkan di Indonesia. Kelemahan produk tersebut diantaranya adalah kestabilan dimensinya yang relatif rendah. Alternatif perbaikan produk bisa dilakukan dengan menambahkan bahan pengaktif komponen kimia. Asam sitrat memiliki tiga gugus karboksil dan diharapkan dapat membentuk ikatan ester dengan gugus hidroksil pada permukaan kayu. Penelitian menggunakan asam sitrat relatif baru dan belum banyak dikembangkan, oleh karena itu penelitian ini ditujukan untuk pengembangan produk biokomposit dengan menggunakan asam sitrat sebagai bahan pengikat. Bahan yang digunakan adalah pelepah nipah dengan ukuran partikel (halus dan kasar), konsentrasi asam sitrat (0% dan 10%), dan suhu pengempaan (180ºC dan 200°C). Pengujian sifat fisika dan mekanika dilakukan berdasarkan Japanese Industrial Standard untuk papan partikel (JIS A 5908). Penambahan asam sitrat memperlihatkan kenaikan sifat fisika (penyerapan air) dan mekanika papan partikel. Perbedaan ukuran partikel mempengaruhi sifat mekanika papan partikel dimana ukuran partikel kasar memberikan nilai mekanika yang lebih baik dibandingkan dengan ukuran partikel halus. Kualitas papan partikel optimum diperoleh pada kondisi pengempaan 180ºC, penambahan asam sitrat 10% dari partikel ukuran kasar dengan nilai pengembangan tebal 2,4%, penyerapan air 41%, kekuatan rekat internal 0,2 MPa, modulus patah 5,5 MPa, dan modulus elastisitas 1,6 GPa.Kata kunci: asam sitrat, pelepah nipah, konsentrasi asam sitrat, suhu pengempa Effect of Citric Acid Concentration and Pressing Temperature on the Quality of Particleboard from Nypa FrondAbstractBinderlessboard is one of the potential eco friendly products that can be developed in Indonesia. However, its boards usually have low in dimensional stability. Addition of the chemical agent, such as citric acid, that can improve the dimensional stability is needed. Citric acid has three hydroxyl groups that can be ester-linked with hydroxyl groups from wood. Researches on citric acid and its utilization are relatively limited. This research focused on the development of particleboard using citric acid as bonding agent. Nypa frond was used as raw material with two different sizes of particles, namely fine and coarse particles. Addition of citric acid of 10% air-dried particles was done for improving the dimensional stability. Pressing temperature was set at 180ºC dan 200°C during 15 minutes. Physical and mechanical properties were done according to Japanese Industrial Standard JIS A 5908. Addition of citric acid could improve physical and mechanical properties of the boards. Coarse particles provided the particleboards with better mechanical properties compared to fine particle. Boards that made from coarse particle and 10% citric acid at pressing temperature of 180ºC have optimum properties, i.e. thickness swelling 2.4%, water absorption 41%, internal bond strength 0.2 MPa, modulus of rupture 5.5 MPa, dan modulus of elastisity 1.6 GPa.
    Type of Medium: Online Resource
    ISSN: 2477-3751 , 0126-4451
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2014
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  • 3
    Online Resource
    Online Resource
    Masyarakat Peneliti Kayu Indonesia ; 2017
    In:  Wood Research Journal Vol. 4, No. 1 ( 2017-04-19), p. 31-35
    In: Wood Research Journal, Masyarakat Peneliti Kayu Indonesia, Vol. 4, No. 1 ( 2017-04-19), p. 31-35
    Abstract: Converting biomass waste to high value-added product, such as biocomposite, tends to attract the interest of researcher and industry. Reducing the utilization of synthetic resin adhesives becomes one of the important points, considering the safe global environment. Binderlessboard is a product whose bonding depends mainly on the chemical composition of the raw materials. The aim of this research was to develop bio-based composites made from bamboo biomass waste materials. This report focused on the physical and mechanical properties of the particleboards. To improve the properties of the boards, the possibility of using citric acid was investigated and discussed. Petung bamboo particles (Dendrocalamus asper Backer) were used in this research. The contents of citric acid were ranged in 0% (binderlessboard), 10%, and 20% based on dried particles. The dimension of the boards was 25 x 25 x 0.7 cm, with the target density was 0.9 g/cm3. The particleboards were hot pressed at 200ºC and 220ºC for 10 and 15 min. The physical and mechanical properties of those particleboards were then evaluated based on Japanese Industrial Standard A 5908 for particleboard. The results showed that the physical and mechanical properties of the boards improved significantly by adding the citric acid. The bamboo particleboards obtained had good properties, with the spesific IB, specific MOR and specific MOE values under the optimum condition of 20 wt % citric acid content and 200ºC hot press were 0.44 MPa, 15.1 MPa and 4.6 GPa, respectively. It stated that bamboo particleboards bonded using citric acid had high performance on mechanical properties and good dimensional stability.
    Type of Medium: Online Resource
    ISSN: 2774-9320 , 2087-3840
    Language: Unknown
    Publisher: Masyarakat Peneliti Kayu Indonesia
    Publication Date: 2017
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  • 4
    In: Wood Research Journal, Masyarakat Peneliti Kayu Indonesia, Vol. 9, No. 2 ( 2020-05-13), p. 52-59
    Abstract: High productivity fast growing species plantation establishment such as the line planting of red meranti (i.e Shorealeprosula and Shorea parvifolia) with intensive silviculture is one potential solution to improve wood supply for industries in Indonesia. However, the information of anatomical properties and wood properties of these two species related to the influence of the line planting system and tree growth rate is limited. This paper studies the anatomical features, wood cell proportions, fiber dimensions and physical properties of wood in radial variation in relation to the line planting effect and tree growth rate. Wood of the trees grown in the line planting system showed higher proportion of vessel element compared to those of wood from natural forest. The vessel diameter of wood from the line planting was also larger than that of in wood from natural forest. The specific gravity of wood from Shorea parvifolia grown on the line planting was higher than that of wood grown in natural forest. The variation of specific gravity on wood portion near to the pith of Shorea leprosula and Shorea parvifolia trees grown on the line planting was related to the variation of the cell wall thickness. The bigger diameter of trees grown or the faster growth rate in the line of planting at the same age shows the greater vessel diameter in wood of Shorea leprosula and Shorea parvifolia and greater specific gravity of Shorea parvifolia wood.
    Type of Medium: Online Resource
    ISSN: 2774-9320 , 2087-3840
    Language: Unknown
    Publisher: Masyarakat Peneliti Kayu Indonesia
    Publication Date: 2020
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  • 5
    Online Resource
    Online Resource
    Masyarakat Peneliti Kayu Indonesia ; 2020
    In:  Wood Research Journal Vol. 10, No. 2 ( 2020-07-21), p. 48-52
    In: Wood Research Journal, Masyarakat Peneliti Kayu Indonesia, Vol. 10, No. 2 ( 2020-07-21), p. 48-52
    Abstract: The aim of this study was to investigate the effect of gum rosin impregnation upon a low quality young teak wood in order to enhance its quality. The main objective of the treatment was to enhance the dimensional stability, as well as strength and to reduce the hygroscopicity. A 15-years old thinned teak wood (Tectona grandis L.f.) and gum rosin from Pinus merkusii Jungh. et de Vries were used for wood modification treatment by impregnation. Three kinds of non-polar solvents, i.e. turpentine oil, petroleum oil and n-hexane-, were used to make gum rosin solution. The results indicated that gum rosin impregnation did not markedly enhance the quality of young teak wood in terms of either dimensional stability or hygroscopicity; however, a little enhancement was delivered by using 15% gum rosin solution with n-hexane as the solvent. The treatment with petroleum oil solvent (at concentration of 7.5%) and at 15% concentration with n-hexane solvent resulted in highest bending properties. The highest bonding strength in dry condition was resulted by treatment with turpentine oil solvent.
    Type of Medium: Online Resource
    ISSN: 2774-9320 , 2087-3840
    Language: Unknown
    Publisher: Masyarakat Peneliti Kayu Indonesia
    Publication Date: 2020
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  • 6
    In: Polymers, MDPI AG, Vol. 13, No. 23 ( 2021-11-24), p. 4090-
    Abstract: The fibrovascular bundle (FVB) in palm plants consists of fiber and vascular tissue. Geometrically, it is a long fiber that can be used as an oriented board raw material. This research aimed to examine the performance of citric acid-bonded orientation boards from modified FVB salacca frond under NaOH + Na2SO3 treatment and the bonding mechanism between the modified FVB frond and citric acid. The results showed that changes in the chemical composition of FVB have a positive effect on the contact angle and increase the cellulose crystallinity index. Furthermore, the mechanical properties of the oriented board showed that 1% NaOH + 0.2% Na2SO3 with 60 min immersion has a higher value compared to other treatments. The best dimension stability was on a board with the modified FVB of 1% NaOH + 0.2% Na2SO3 with 30 and 60 min immersion. The bonding mechanism evaluated by FTIR spectra also showed that there is a reaction between the hydroxyl group in the modified FVB and the carboxyl group in citric acid. This showed that the modified combination treatment of NaOH+Na2SO3 succeeded in increasing the mechanical properties and dimensional stability of the orientation board from the FVB salacca frond.
    Type of Medium: Online Resource
    ISSN: 2073-4360
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2527146-5
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  • 7
    Online Resource
    Online Resource
    IOP Publishing ; 2020
    In:  IOP Conference Series: Materials Science and Engineering Vol. 801, No. 1 ( 2020-05-01), p. 012088-
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 801, No. 1 ( 2020-05-01), p. 012088-
    Abstract: In order to utilize durian seeds waste, production of wood adhesive made from them was carried out. Method of dextrinization was applied and characterizations of the adhesive’s properties were evaluated, namely specific gravity, viscosity, gel time, pH, clarity, color, and microscopic description including the particle’s size of the adhesives. The properties were compared to other starch based adhesives, such as sago and tapioca. For further utilization as wood adhesive, application for particleboard binder was investigated. Parameter of internal bonding of the board then was evaluated. Result of this work showed fundamental properties of dextrin adhesive made of durian seed were similar with sago and tapioca’s dextrin excluding the colour. Values of internal bonding of particleboard were varied that indicated many factors affected the quality of particleboard for instance the distribution of the adhesive.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2506501-4
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  • 8
    Online Resource
    Online Resource
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 896 ( 2014-2), p. 562-565
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 896 ( 2014-2), p. 562-565
    Abstract: This research focused on physical and mechanical properties of biocomposite made from bamboo and citric acid as natural binder. Bamboo particles was mixed with citric acid at 0 – 40 wt% resin content based on air-dried particles and each mixture was hot pressed at 180 °C for 10 min. The result showed that addition of citric acid could improve significantly the physical and mechanical properties of particleboard. The thickness swelling was 50 % for bamboo binderless particleboard (0 wt%), whereas it decreased to 7 % under a resin content of 10 wt%. The optimum resin content in this study was 30 wt%, while the modulus of rupture dan the modulus of elasticity were 14 MPa and 4.5 GPa, respectively. The ester linkages were detected by Fourier transform infrared spectroscopy, indicating that carboxyl groups from citric acid reacted with hydroxyl groups from bamboo to produce better properties of particleboard, especially its dimensional stability. Based on these results, it was concluded that citric acid could be as a potential natural binder for bamboo particleboard.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2265002-7
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  • 9
    In: Remote Sensing, MDPI AG, Vol. 4, No. 10 ( 2012-10-15), p. 3058-3077
    Type of Medium: Online Resource
    ISSN: 2072-4292
    Language: English
    Publisher: MDPI AG
    Publication Date: 2012
    detail.hit.zdb_id: 2513863-7
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  • 10
    Online Resource
    Online Resource
    The Korean Society of Wood Science Technology ; 2022
    In:  Journal of the Korean Wood Science and Technology Vol. 50, No. 6 ( 2022-11), p. 392-403
    In: Journal of the Korean Wood Science and Technology, The Korean Society of Wood Science Technology, Vol. 50, No. 6 ( 2022-11), p. 392-403
    Type of Medium: Online Resource
    ISSN: 1017-0715 , 2233-7180
    Language: English
    Publisher: The Korean Society of Wood Science Technology
    Publication Date: 2022
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