scholarly journals Synthesis and Characterization of Room Temperature Vulcanized Silicone Rubber Using Methoxyl-Capped MQ Silicone Resin as Self-Reinforced Cross-Linker

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1142 ◽  
Author(s):  
Jianye Ji ◽  
Xin Ge ◽  
Xiaoyan Pang ◽  
Ruoling Liu ◽  
Shuyi Wen ◽  
...  
Keyword(s):  
Silicone Rubber ◽  
Room Temperature ◽  
Degradation Rate ◽  
Light Transmission ◽  
Characteristic Temperature ◽  
Cross Linking ◽  
Silicone Resin ◽  
Cross Linker ◽  
Rtv Silicone Rubber

Methoxyl-capped MQ silicone resin (MMQ) was first synthesized by the hydrosilylation of vinyl-containing MQ silicone resin and trimethoxysilane and then used in condensed room-temperature vulcanized (RTV) silicone rubber as a self-reinforced cross-linker. Results show that modified silicone rubber exhibits good light transmission. Compared with unmodified silicone rubber, the hardness, tensile strength and elongation of MMQ at the break are increased by 26.4 A, 2.68 MPa and 65.1%, respectively. In addition, the characteristic temperature of 10% mass loss is delayed from 353.5 °C to 477.1 °C, the temperature at maximum degradation rate is also delayed from 408.9 °C to 528.4 °C and the residual mass left at 800 °C is increased from 1.2% to 27.7%. These improved properties are assigned to the synergistic effect of the rigid structure of MMQ, the formation of a dense cross-linking structure in polymers and the uniform distribution of MMQ cross-linking agent in RTV silicone rubber.

Preparation and characterization of room temperature vulcanized silicone rubber using α-amine ketoximesilanes as auto-catalyzed cross-linkers

RSC Advances ◽  
2016 ◽  
Vol 6 (44) ◽  
pp. 38447-38453 ◽  
Author(s):  
Qian Zhao ◽  
Qingyang Liu ◽  
Huihui Xu ◽  
Yiling Bei ◽  
Shengyu Feng
Keyword(s):  
Silicone Rubber ◽  
Room Temperature ◽  
Rtv Silicone Rubber

A series of α-amine ketoximesilanes were prepared and used as auto-catalyzed cross-linkers in one component room temperature vulcanized (RTV) silicone rubber.

Synthesis and thermal properties of modified room temperature vulcanized (RTV) silicone rubber using polyhedral oligomeric silsesquioxane (POSS) as a cross linking agent

RSC Advances ◽  
2014 ◽  
Vol 4 (78) ◽  
pp. 41453-41460 ◽  
Author(s):  
Yunhui Shi ◽  
Xiaoxiao Gao ◽  
Dian Zhang ◽  
Yufeng Liu ◽  
Guangsu Huang
Keyword(s):  
Thermal Properties ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Cross Linking ◽  
Oligomeric Silsesquioxane ◽  
Rtv Silicone Rubber

Incompletely condensed tetra-silanol-phenyl-polyhedral oligomeric silsesquioxane (TOPO) was synthesized first and then copolymerized with hydroxy terminated polydimethylsiloxane (HPDMS) as a cross linking agent to prepare room temperature vulcanized (RTV) silicone rubber (TOPO–PDMS).

scholarly journals A novel crosslinking agent of polymethyl(ketoxime)siloxane for room temperature vulcanized silicone rubbers: synthesis, properties and thermal stability

RSC Advances ◽  
2018 ◽  
Vol 8 (23) ◽  
pp. 12517-12525 ◽  
Author(s):  
Xibing Zhan ◽  
Xiqing Cai ◽  
Junying Zhang
Keyword(s):  
Thermal Stability ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Crosslinking Agent ◽  
Synthesis Properties ◽  
Cross Linker ◽  
Silicone Rubbers ◽  
Rtv Silicone Rubber

A novel cross-linker polymethyl(ketoxime)siloxane was synthesized and then was cured with hydroxyl-terminated polydimethylsiloxane matrix to fabricate a series of novel RTV silicone rubber. Their properties was comparatively investigated.

scholarly journals Synthesis and Characterization of Chemically Cross-Linked CMC/Acrylamide Hydrogels

2020 ◽  
Vol 32 (5) ◽  
pp. 1109-1115
Author(s):  
Shivakumara Lachakkal Rudrappa ◽  
Sudhir Ramaswamy Iliger ◽  
Demappa Thippaiah
Keyword(s):  
Room Temperature ◽  
Aluminum Sulfate ◽  
Ammonium Persulfate ◽  
Sem Analysis ◽  
Cross Linking ◽  
Swelling Behaviour ◽  
Buffer Solutions ◽  
Aluminium Sulfate ◽  
Chemical Cross Linking

Carboxymethyl cellulose/poly(acrylamide) (CMC/Amm) hydrogels were synthesized by the chemical cross-linking method. Ammonium persulfate used as an initiator, while aluminium sulfate used as a cross-linking agent. The structure and morphology of the hydrogels were characterized by FTIR and scanning electron microscopy (SEM) analysis. The swelling behaviour of the hydrogels can be studied by using acids (CH3COOH, HCl and HClO4) and also in the pH of the buffer solutions at different temperature (room temperature, 30 and 37 ºC) was studied. Swelling of hydrogels increased with an increase in the concentration of aluminum sulfate up to 20 %, above 20 % it has found to be decreased. The effect of four series of cationic different concentrated salt solutions on the swelling had found to be the following order K+ > Na+ > Ca2+ > Mg2+.

Synthesis and characterization of polyethylene glycol polyacrylamide copolymer (PEGA) resins containing carbohydrate ligands. Evaluation as supports for affinity chromatography

1998 ◽  
Vol 76 (8) ◽  
pp. 1109-1118 ◽  
Author(s):  
France-Isabelle Auzanneau ◽  
Mette Knak Christensen ◽  
Shannon L Harris ◽  
Morten Meldal ◽  
B Mario Pinto
Keyword(s):  
Polyethylene Glycol ◽  
Radical Copolymerization ◽  
Cross Linking ◽  
Carbohydrate Binding ◽  
Streptococcus Group ◽  
Group A ◽  
Carbohydrate Ligands ◽  
Immunoaffinity Columns ◽  
Cross Linker

The PEGA resin, a beaded polyethylene glycol dimethylacrylamide copolymer, was evaluated as an affinity support for the purification of carbohydrate-binding macromolecules, namely, the cation-independent mannosyl phosphate receptor (CI-MPR) and a polyclonal antibody directed against a Streptococcus Group A oligosaccharide. Two polyethylene glycol (PEG) derivatives, a di-acryloylated PEG1900derivative or a longer di-acryloylated PEG4000derivative, were used as cross-linkers. The longer cross-linker was synthesized in four steps from polyethylene glycol 4000. The mannosyl 6-phosphate (M6P)-containing immunoaffinity columns were prepared through the inverse suspension radical copolymerization of the corresponding allyl glycoside with acrylamide and the PEG cross-linker. The resin with the shorter cross-linker (PEG1900derivative) had a 6.3% molar cross-linking while that with the longer cross-linker (PEG4000derivative) had a 3.8% molar cross-linking. For the Streptococcus Group A trisaccharide-containing immunoaffinity columns, three PEGA affinity supports bearing free amino groups were prepared and subsequently substituted with a trisaccharide activated as its squarate adduct. While one resin contained the shorter cross-linker PEG1900and had a 3% molar cross-linking, the other two resins contained the longer cross-linker PEG4000 with a molar cross-linking of 5% and 3%, respectively. In affinity chromatographic studies, the M6P-containing columns were ineffective in retaining the cation-independent mannosyl phosphate receptor (CI-MPR, ~ 215kDa), whereas antibody (~ 150kDa) retention was observed with two of the three Streptococcus Group A trisaccharide-containing immunoaffinity columns. Key words: PEGA resins, immunoaffinity supports, carbohydrate ligands, antibody purification.

Obtention and Characterization of Collagen and Chitosan Based Cements for Bone Regerneration. Part 1: Extraction and Characterization of Collagen

2014 ◽  
Vol 775-776 ◽  
pp. 29-33 ◽  
Author(s):  
Karine Cappucio de Castro ◽  
Ivan Silva Prado ◽  
Moacyr Clemente Júnior ◽  
Sylma Carvalho Maestrelli ◽  
Neide Aparecida Mariano ◽  
...  
Keyword(s):  
Cross Linking ◽  
Infrared Analysis ◽  
Fiber Structure ◽  
Cross Link ◽  
Scanning Calorimetry ◽  
High Mechanical Strength ◽  
Structure Characteristics ◽  
Cross Linker ◽  
High Degree

Several cements are used as biomaterials. Biopolymers such as chitosan and collagen exhibit excellent biocompatibility and can be used in the remodeling of bone tissue. The cement must have high mechanical strength and compatibility with original tissue. In this context, the objective of this study was to extract, characterize and cross-link collagen from bovine tendon, forlater associate it with chitosan and calcium phosphate to obtain cements for bone regeneration. Glutaraldehyde was used as cross-linker in 0.1, 0.5, 1.0 and 10% concentration. Infrared analysis confirmed the presence of functional groups characteristic of collagen, whereas the capacity of water absorption decreased with the increasing of cross-linking degree. Denaturation temperatures of collagen samples were obtained by Differential Scanning Calorimetry and Scanning Electron Microscopy showed the fiber structure characteristics of collagen, which were more organized for high degree of cross-linking samples.

Clay modification with silane compounds and characterization of the silicone rubber/clay composites

2012 ◽  
Vol 32 (8-9) ◽  
pp. 493-502 ◽  
Author(s):  
Kyeong Hoon Jang ◽  
Eung-Soo Kim ◽  
Young Ho Jeon ◽  
Jin-San Yoon
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Silicone Rubber ◽  
Cross Linking ◽  
Mechanical And Thermal Properties ◽  
Curing Agent ◽  
Thiol Groups ◽  
Rubber Composites ◽  
Clay Modification

Abstract Na+ montmorillonite (MMT) was modified with benzyldimethyltetradecylammonium chloride (B13) and further with (3-mercaptopropyl)triethoxysilane and vinyltrimethoxysilane to prepare B13-MMT, mercaptomethylorthosilicate modified MMT (MTMO), and vinyltrimethoxysilane modified MMT (VTMO), respectively. The pristine and modified clays were compounded with an HTV-type silicone rubber (GP-30®), and the physical properties and morphology of the resulting rubber composites were examined. Both HTV/MTMO and HTV/VTMO exhibited an intercalated/exfoliated coexisting morphology, but the degree of exfoliation of the former composite was higher than that of the latter. Moreover, the thermal stability, as assessed by the onset temperature of thermal degradation, as well as the tensile stress, elongation at the break, and tear strength of HTV/MTMO was higher than those of HTV/B13-MMT and HTV/VTMO. However, the cross-linking density of HTV/MTMO was the lowest among the composites examined because the thiol groups of MTMO extinguished and abstracted the radicals formed by the curing agent. Accordingly, the improved mechanical and thermal properties of HTV/MTMO were attributed to the enhanced interactions between HTV and MTMO due to the chemical reaction between the thiol groups of MTMO and the vinyl groups of HTV.

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