scholarly journals The Effectivity of One-pot Concentrated Maleic Anhydride Hydrolysis for Betung Bamboo Pulp (Dendrocalamus asper sp)

Author(s):  
Wida B. Kusumaningrum ◽  
Putri Amanda ◽  
Lisman Suryanegara ◽  
N. Masruchin
2017 ◽  
Vol 8 (28) ◽  
pp. 4152-4161 ◽  
Author(s):  
Guillaume Moriceau ◽  
Guillaume Gody ◽  
Matthias Hartlieb ◽  
Joby Winn ◽  
HyungSoo Kim ◽  
...  

Functional multisite copolymers with a controlled number and position of side chains were synthesized by a one-pot RAFT polymerization process and post-functionalization.


2015 ◽  
Vol 6 (22) ◽  
pp. 4071-4079 ◽  
Author(s):  
Xiangxiang Jia ◽  
Yan Li ◽  
Jinlong Wu ◽  
Cheng Chen ◽  
Lijian Liu

Oligopyrazoline, synthesized conveniently from maleic anhydride and diazoacetates via a one-pot catalyst-free reaction, exhibits fascinating down- and upconversion fluorescence properties.


Polymer ◽  
2010 ◽  
Vol 51 (24) ◽  
pp. 5719-5725 ◽  
Author(s):  
Xue-Ke Sun ◽  
Xing-Hong Zhang ◽  
Shang Chen ◽  
Bin-Yang Du ◽  
Qi Wang ◽  
...  

REAKTOR ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 25 ◽  
Author(s):  
Wida Banar Kusumaningrum ◽  
R Rochmadi ◽  
S Subyakto

Abstract ACETYLATED CELLULOSE FROM BETUNG BAMBOO (Dendrocalamus asper) PULP PRODUCTION AND ITS EFFECT ON MECHANICAL PROPERTIES OF POLYPROPYLENE COMPOSITES. The utilization of natural fiber as reinforcing agent for biocomposite products have some drawbacks, such as its hydrophilicity that are incompatible with PP. Isolation from bundle fibers into micro fibers could improves the biocomposite properties. However, more moisture absorption of micro fiber makes it difficult to handle. Therefore, modification with acetylation is needed to facilitate good interfacial adhesion between cellulose and PP. The objectives of this research are to obtain acetylated micro fibers from betung bamboo pulp for reinforcing agent and to investigate the effect of acetylated cellulose on mechanical properties of PP biocomposites. Acetate anhydride as acetylating agent and sulfuric acid as a catalyst were used for acetylation process. Acetylated cellulose from betung bamboo pulp with fibrous form, hydrophobic condition, and relatively on high aspect ratio was obtained in 2% of catalyst concentration and 120 of reaction time. Strength enhancement were achieved up to 79 and 87% for tensile while 24 and 69% for flexural, respectively for biocomposites with 10% and 20% of acetylated cellulose than that PP. Modulus improvement were obtained up to 53 and 70% for tensile while 96 and 149% for flexural, respectively for biocomposites with 10% and 20% of acetylated cellulose than that PP. Keywords: acetylation; betung bamboo; biocomposite; polypropylene; cellulose   Abstrak Penerapan serat alam untuk produk biokomposit memiliki beberapa kelemahan terutama perbedaan sifat antara matrik dengan serat yang menyebabkan ikatan antar muka yang kurang baik. Pengolahan serat bundle menjadi serat mikro dapat meningkatkan sifat-sifat biokomposit, akan tetapi sifat dari serat mikro yang mudah menyerap air membuat penanganannya menjadi lebih komplek. Modifikasi kimia serat dengan asetilasi merupakan upaya untuk meningkatkan keterbasahan dan ikatan antar muka dengan matrik PP. Tujuan dari penelitian ini adalah untuk memperoleh serat mikro terasetilasi dari pulp bambu betung agar dapat digunakan sebagai penguat dan mempelajari pengaruhnya terhadap sifat mekanis biokomposit PP. Proses asetilasi menggunakan asetat anhidrat sebagai bahan pengasetilasi dan asam sulfat sebagai katalis. Serat mikro bambu betung terasetilasi yang bersifat hidrofobik dan memiliki aspek rasio tinggi diperoleh pada jumlah katalis 2% dengan waktu 120 menit. Peningkatan kuat tekuk mencapai 76 dan 87% sedangkan kuat tarik sekitar 24 dan 69% masing-masing untuk biokomposit dengan selulosa terasetilasi 10% dan 20% terhadap PP murni. Keteguhan tarik meningkat hingga 53 dan 70% sedangkan keteguhan tekuk mencapai 96 dan 149% berturut-turut untuk biokomposit dengan 10% dan 20% selulosa terasetilasi dibandingkan PP. Selulosa terasetilasi dari pulp bambu betung mampu berfungsi sebagai bahan pembentuk inti untuk biokomposit PP. Kata kunci: asetilasi; bambu betung; biokomposit; polipropilena; selulosa


2005 ◽  
Vol 70 (4) ◽  
pp. 579-583 ◽  
Author(s):  
Davood Habibi ◽  
Omid Marvi

The syntheses of cis-3a,4,7,7a-tetrahydroisoindole-1,3-dione derivatives and some cyclic diimides were performed by the reaction of different aromatic and aliphatic amines and diamines with cis-1,2,3,6-tetrahydrophthalic anhydride and maleic anhydride on montmorillonite K-10 under microwave irradiation and solvent- free conditions. The desired attractive products were obtained in high yields and characterized by elemental analysis aswell as by IR and 1H-NMR spectroscopy.


2018 ◽  
Vol 24 (2) ◽  
pp. 103-107 ◽  
Author(s):  
Anusaya S. Chavan ◽  
Arun S. Kharat ◽  
Manisha R. Bhosle ◽  
Ramrao A. Mane

Abstract An efficient and simple one-pot protocol has been developed for synthesis of substituted derivatives of 2-hydrazono-4-thiazolidinone-5-acetic acids 4a–j and 6a–g by cyclocondensation of aryl/pyrazolyl aldehyde, thiosemicarbazide and maleic anhydride in acetonitrile in the presence of readily available whole cell biocatalyst, baker’s yeast (Saccharomyces cerevisiae). The reaction is enhanced by ultrasonication.


1997 ◽  
Vol 62 (1) ◽  
pp. 124-129 ◽  
Author(s):  
Ivica Sigmundová ◽  
Mária Mečiarová

The direct two step synthesis of three new 2-hydrazono-4-oxo-5-thiazolidineacetic acids from thiosemicarbazide, the appropriate ketones (acetophenone, cyclopentanone, cyclohexanone) and maleic anhydride is described. The prepared acids were transformed, via their mixed anhydrides with ethyl carbonate, into their alkylamides in a one-pot procedure.


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