Photoresins based on acrylated epoxidized soybean oil and benzenedithiols for optical 3D printing

2019 ◽  
Vol 25 (2) ◽  
pp. 378-387 ◽  
Author(s):  
Greta Miezinyte ◽  
Jolita Ostrauskaite ◽  
Egidija Rainosalo ◽  
Edvinas Skliutas ◽  
Mangirdas Malinauskas
Keyword(s):  
3D Printing ◽  
Soybean Oil ◽  
Real Time ◽  
Insoluble Fraction ◽  
Polymer Chains ◽  
Epoxidized Soybean Oil ◽  
Cross Linking ◽  
Content Type ◽  
Cross Links ◽  
Acrylated Epoxidized Soybean Oil

Purpose The purpose of this paper is the design and investigation of novel acrylated epoxidized soybean oil-based photocurable systems as candidate materials for optical 3D printing. Design/methodology/approach Aromatic dithiols, benzene-1,3-dithiol or benzene-1,4-dithiol, were used as cross-linking agents of acrylated epoxidized soybean oil in these systems. Kinetics of photocross-linking was investigated by real-time photorheometry using two different photoinitiators, 2, 2-dimethoxy-2-phenylacetophenone or 2-hydroxy-2-methylpropiophenone, in different quantities. The effect of the initial composition on the rate of photocross-linking, mechanical, thermal properties and swelling of obtained polymers was investigated. Findings The rate of photocross-linking was higher, more cross-links and shorter polymer chains between cross-linking points of the network were formed when benzene-1,4-dithiol and 2, 2-dimethoxy-2-phenylacetophenone were used in compositions. The higher yield of insoluble fraction, glass transition temperatures and values of compressive modulus were obtained when benzene-1,3-dithiol and 2, 2-dimethoxy-2-phenylacetophenone were used in compositions. Originality/value This is the first study of acrylated epoxidized soybean oil-based thiol-ene system by real-time photorheometry. The designed novel photocurable systems based on acrylated epoxidized soybean oil and benzenedithiols are promising renewable photoresins for rapid optical 3D printing on demand.

scholarly journals Effect of Selected Thiols on Cross-Linking of Acrylated Epoxidized Soybean Oil and Properties of Resulting Polymers

Polymers ◽  
2018 ◽  
Vol 10 (4) ◽  
pp. 439 ◽  
Author(s):  
Sigita Kasetaite ◽  
Silvia De la Flor ◽  
Angels Serra ◽  
Jolita Ostrauskaite
Keyword(s):  
Soybean Oil ◽  
Epoxidized Soybean Oil ◽  
Cross Linking ◽  
Acrylated Epoxidized Soybean Oil

scholarly journals mSLA-based 3D Printing of Acrylated Epoxidized Soybean Oil - Nano-Hydroxyapatite Composites for Bone Repair

2021 ◽  
pp. 112456
Author(s):  
Dibakar Mondal ◽  
Zahra Haghpanah ◽  
Connor J. Huxman ◽  
Sophie Tanter ◽  
Duo Sun ◽  
...  
Keyword(s):  
3D Printing ◽  
Soybean Oil ◽  
Bone Repair ◽  
Epoxidized Soybean Oil ◽  
Acrylated Epoxidized Soybean Oil

3D printing acrylated epoxidized soybean oil reinforced with functionalized cellulose by UV curing

2021 ◽  
pp. 51561
Author(s):  
Zengshe Liu ◽  
Daniel A. Knetzer ◽  
Jifu Wang ◽  
Fuxiang Chu ◽  
Chuanwei Lu ◽  
...  
Keyword(s):  
3D Printing ◽  
Soybean Oil ◽  
Uv Curing ◽  
Epoxidized Soybean Oil ◽  
Acrylated Epoxidized Soybean Oil

scholarly journals Site-Directed Cross-Linking Identifies the Stator-Rotor Interaction Surfaces in a Hybrid Bacterial Flagellar Motor

2021 ◽  
Vol 203 (9) ◽  
Author(s):  
Hiroyuki Terashima ◽  
Seiji Kojima ◽  
Michio Homma
Keyword(s):  
Escherichia Coli ◽  
Cross Linking ◽  
Physical Interaction ◽  
Flagellar Motor ◽  
Intact Cells ◽  
Content Type ◽  
Bacterial Flagellum ◽  
Cross Links ◽  
Bacterial Flagellar Motor ◽  
Rotary Motor

ABSTRACT The bacterial flagellum is the motility organelle powered by a rotary motor. The rotor and stator elements of the motor are located in the cytoplasmic membrane and cytoplasm. The stator units assemble around the rotor, and an ion flux (typically H+ or Na+) conducted through a channel of the stator induces conformational changes that generate rotor torque. Electrostatic interactions between the stator protein PomA in Vibrio (MotA in Escherichia coli) and the rotor protein FliG have been shown by genetic analyses but have not been demonstrated biochemically. Here, we used site-directed photo-cross-linking and disulfide cross-linking to provide direct evidence for the interaction. We introduced a UV-reactive amino acid, p-benzoyl-l-phenylalanine (pBPA), into the cytoplasmic region of PomA or the C-terminal region of FliG in intact cells. After UV irradiation, pBPA inserted at a number of positions in PomA and formed a cross-link with FliG. PomA residue K89 gave the highest yield of cross-links, suggesting that it is the PomA residue nearest to FliG. UV-induced cross-linking stopped motor rotation, and the isolated hook-basal body contained the cross-linked products. pBPA inserted to replace residue R281 or D288 in FliG formed cross-links with the Escherichia coli stator protein, MotA. A cysteine residue introduced in place of PomA K89 formed disulfide cross-links with cysteine inserted in place of FliG residues R281 and D288 and some other flanking positions. These results provide the first demonstration of direct physical interaction between specific residues in FliG and PomA/MotA. IMPORTANCE The bacterial flagellum is a unique organelle that functions as a rotary motor. The interaction between the stator and rotor is indispensable for stator assembly into the motor and the generation of motor torque. However, the interface of the stator-rotor interaction has only been defined by mutational analysis. Here, we detected the stator-rotor interaction using site-directed photo-cross-linking and disulfide cross-linking approaches. We identified several residues in the PomA stator, especially K89, that are in close proximity to the rotor. Moreover, we identified several pairs of stator and rotor residues that interact. This study directly demonstrates the nature of the stator-rotor interaction and suggests how stator units assemble around the rotor and generate torque in the bacterial flagellar motor.

scholarly journals Printable Alginate Hydrogels with Embedded Network of Halloysite Nanotubes: Effect of Polymer Cross-Linking on Rheological Properties and Microstructure

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4130
Author(s):  
Svetlana A. Glukhova ◽  
Vyacheslav S. Molchanov ◽  
Boris V. Lokshin ◽  
Andrei V. Rogachev ◽  
Alexey A. Tsarenko ◽  
...  
Keyword(s):  
3D Printing ◽  
Rheological Properties ◽  
Shear Thinning ◽  
Halloysite Nanotubes ◽  
Polymer Chains ◽  
Cross Linking ◽  
Saxs Data ◽  
Nanocomposite Hydrogels ◽  
Embedded Network ◽  
The Cross

Rapidly growing 3D printing of hydrogels requires network materials which combine enhanced mechanical properties and printability. One of the most promising approaches to strengthen the hydrogels consists of the incorporation of inorganic fillers. In this paper, the rheological properties important for 3D printability were studied for nanocomposite hydrogels based on a rigid network of percolating halloysite nanotubes embedded in a soft alginate network cross-linked by calcium ions. Particular attention was paid to the effect of polymer cross-linking on these properties. It was revealed that the system possessed a pronounced shear-thinning behavior accompanied by a viscosity drop of 4–5 orders of magnitude. The polymer cross-links enhanced the shear-thinning properties and accelerated the viscosity recovery at rest so that the system could regain 96% of viscosity in only 18 s. Increasing the cross-linking of the soft network also enhanced the storage modulus of the nanocomposite system by up to 2 kPa. Through SAXS data, it was shown that at cross-linking, the junction zones consisting of fragments of two laterally aligned polymer chains were formed, which should have provided additional strength to the hydrogel. At the same time, the cross-linking of the soft network only slightly affected the yield stress, which seemed to be mainly determined by the rigid percolation network of nanotubes and reached 327 Pa. These properties make the alginate/halloysite hydrogels very promising for 3D printing, in particular, for biomedical purposes taking into account the natural origin, low toxicity, and good biocompatibility of both components.

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