scholarly journals Improvement of wood material properties via in situ polymerization of styrene into tosylated cell walls

RSC Advances ◽  
2014 ◽  
Vol 4 (25) ◽  
pp. 12981 ◽  
Author(s):  
Mahmut A. Ermeydan ◽  
Etienne Cabane ◽  
Notburga Gierlinger ◽  
Joachim Koetz ◽  
Ingo Burgert
Keyword(s):  
Material Properties ◽  
Cell Walls ◽  
In Situ Polymerization ◽  
Wood Material

Bacterial Macrofibers and Bionites: Materials of Natural and Synthetic Design

1993 ◽  
Vol 330 ◽  
Author(s):  
Neil H. Mendelson
Keyword(s):  
Material Properties ◽  
Cell Walls ◽  
Potassium Phosphate ◽  
The Other ◽  
Single Chain ◽  
Crystal Forms ◽  
Iron Copper ◽  
Negative Supercoiling ◽  
Viscous Solutions

ABSTRACTTwo fiber forms can be obtained from cells of the rod-shaped bacterium,Bacillus subtilis, one called macrofibers, the other bacterial thread. Macrofibers are highly organized, multicellular structures, millimeters in length that selfassemble in a unique way. Each fiber is essentially a single chain of cells linked end-to-end that has repeatedly folded upon itself and twisted into helical form. The growth of individual cells yields both the material of the macrofiber and the forces required for its assembly. The forces involved stem from twisting motions caused by cell growth geometry. The folding process is akin to negative supercoiling. New approaches have been used to estimate the magnitude of forces. Torque generated by single filaments has been estimated from snapopening motions resulting from aborted attempts at folding to be in the range of 10−10to10−8dyne-cm. In contrast, multifilament fibers carrying small wires in their loops must have generated a torque of at least 10−5dyne-cm and a supercoiling force of at least 10−5dyne in order to have moved the wires in viscous solutions at the rates observed. The second bacterial fiber form, bacterial thread, and its mineralized derivatives, called bionites, are man-made materials. They are produced by the drawing and drying of bacterial cell filaments from cultures grown in the form of a textile-like web. The material properties of bacterial thread reflect primarily those of the strength-bearing cell wall polymer, peptidoglycan. A variety of new fiber-like materials have been produced by mineralizing the cell walls in situ in web cultures and drawing the products. Iron, copper, calcium, and potassium phosphate-containing bionites have been obtained in this manner. We are currently searching for order in the bionite crystal forms that may reflect the electrostatic nature of the wall polymer structural templates.

scholarly journals Improvement of Mechanical, Hydrophobicity and Thermal Properties of Chinese Fir Wood by Impregnation of Nano Silica Sol

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1632 ◽  
Author(s):  
Enguang Xu ◽  
Yanjuan Zhang ◽  
Lanying Lin
Keyword(s):  
Mechanical Properties ◽  
Cell Walls ◽  
In Situ Polymerization ◽  
Silica Sol ◽  
Chinese Fir ◽  
Nano Silica ◽  
Amorphous Sio2 ◽  
Covalent Bonds ◽  
Oh Groups

In this paper, a wood-SiO2 composite material was prepared via in-situ polymerization using vacuum/pressure impregnation technology using commercial scale nano silica sol and Chinese Fir (Cunninghamia lanceolate (Lamb.) Hook.). Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TG), and water contact angle were used to study the changes in the microstructure and physical and mechanical properties of this composite. The results showed that silica sol can penetrate and distribute into the wood cell cavities and surface of cell walls and hence combine with the substances of wood materials. FTIR results indicated that the –OH groups of wood can polycondense in-situ with silica sol to form Si–O–C covalent bonds, and amorphous SiO2 formed from Si–O–Si bonds between the –OH groups of silica sol did not change the crystalline structure of wood cell walls. This in-situ formulating composite significantly improved the compact microstructure, thermal and mechanical properties, and hydrophobicity of the composites.

Durability of Wood-PMMA Composite

2010 ◽  
Vol 26-28 ◽  
pp. 830-834 ◽  
Author(s):  
Jian Li ◽  
Yong Feng Li ◽  
Xin Meng ◽  
Yi Xing Liu
Keyword(s):  
Cell Walls ◽  
Cellular Structure ◽  
In Situ Polymerization ◽  
Untreated Wood ◽  
Acid Resistance ◽  
Water Repellency ◽  
Decay Resistance ◽  
Chemical Combination ◽  
Pmma Polymer

Wood-PMMA composite was manufactured by impregnating methyl methacralyte (MMA) monomers into wood porous structure, followed by in-situ polymerization through catalyst-thermal treatment. The structure was simply analyzed by SEM and FTIR, and its durability was also examined. The results indicate that PMMA polymer generated in wood cellular structure, and interacted with wood cell walls, resulting in chemical combination between them. The durability involving dimensional stability, water repellency, decay resistance as well as acid resistance was whole improved over untreated wood. Such composite enhancing wood values can be used as structural furniture material and traffic material.

Improvement in mechanical, physical and biological properties of eucalyptus and pine woods by raw pine resin in situ polymerization

2021 ◽  
Vol 166 ◽  
pp. 113495
Author(s):  
Andrey Pereira Acosta ◽  
Kelvin Techera Barbosa ◽  
Sandro Campos Amico ◽  
André Luiz Missio ◽  
Rafael de Avila Delucis ◽  
...  
Keyword(s):  
In Situ Polymerization ◽  
Biological Properties ◽  
Pine Resin

Juvenile and Mature Pinewoods Treated by in situ Polymerization with Poly(vinyl acetate)

2021 ◽  
Author(s):  
Andrey Acosta ◽  
Ezequiel Gallio ◽  
Paula Zanatta ◽  
Henrique Schulz ◽  
Rafael de Avila Delucis ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
In Situ Polymerization

scholarly journals Morphology and crystallization kinetics of Rubber-modified Nylon 6 Prepared by Anionic In-situ Polymerization

2020 ◽  
Vol 27 (1) ◽  
pp. 204-215
Author(s):  
Hongkai Zhao ◽  
Dengchao Zhang ◽  
Yingshuang Li
Keyword(s):  
Crystallization Kinetics ◽  
In Situ Polymerization ◽  
Good Description ◽  
Nylon 6 ◽  
Avrami Equation ◽  
Infrared Analysis ◽  
Chain Segment ◽  
The Impact ◽  
Kinetics Of

AbstractIn this work, we modified nylon 6 with liquid rubber by in-situ polymerization. The infrared analysis suggested that HDI urea diketone is successfully blocked by caprolactam after grafting on hydroxyl of HTPB, and the rubber-modified nylon copolymer is generated by the anionic polymerization. The impact section analysis indicated the rubber-modified nylon 6 resin exhibited an alpha crystal form.With an increase in the rubber content, nylon 6 was more likely to generate stable α crystal. Avrami equation was a good description of the non-isothermal crystallization kinetics of nylon-6 and rubber-modified nylon-6 resin. Moreover, it is found that the initial crystallization temperature of nylon-6 chain segment decreased due to the flexible rubber chain segment. n value of rubber-modified nylon-6 indicated that its growth was the coexistence of two-dimensional discoid and three-dimensional spherulite growth. Finally, the addition of the rubber accelerated the crystallization rate of nylon 6.

Sign in / Sign up

Export Citation Format

Share Document