Ring opening of 2,3-bis(hydroxymethyl)methylenecyclopropanes with [Fe2(CO)9]; the molecular structure of a 1,4-diene complex of iron(0), tricarbonyl-η4-(3-methylene-4-vinyldiphydrofuran-2(3H)-one) iron

1975 ◽  
pp. 487-489 ◽  
Author(s):  
Michael Green ◽  
Russell P. Hughes ◽  
Alan J. Welch
Keyword(s):  
Molecular Structure ◽  
Ring Opening ◽  
Diene Complex

Molecular Structure–Catalytic Activity Relationship in the Ring-Opening Polymerization of (Macro)lactones

2016 ◽  
Vol 49 (3) ◽  
pp. 796-806 ◽  
Author(s):  
Mark P. F. Pepels ◽  
Inge Hermsen ◽  
Geert J. Noordzij ◽  
Rob Duchateau
Keyword(s):  
Molecular Structure ◽  
Catalytic Activity ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Activity Relationship

X-Ray evidence for a mononuclear s-trans-η4-1,3-diene complex; molecular structure of Zr(η5-C5H5)2(s-trans-PhCHCH–CHCHPh)

1982 ◽  
pp. 191-192 ◽  
Author(s):  
Yasushi Kai ◽  
Nobuko Kanehisa ◽  
Kunio Miki ◽  
Nobutami Kasai ◽  
Kazushi Mashima ◽  
...  
Keyword(s):  
Molecular Structure ◽  
X Ray ◽  
Diene Complex

Preparation, Characterization and Application of Siloxane Succinate Fatliquor

2011 ◽  
Vol 233-235 ◽  
pp. 292-297 ◽  
Author(s):  
Tao Tao Qiang ◽  
Xiang Luo ◽  
Long Fang Ren ◽  
Xue Chuan Wang ◽  
Bao Yuan He
Keyword(s):  
Molecular Structure ◽  
Mechanical Properties ◽  
Castor Oil ◽  
Ring Opening ◽  
Rapeseed Oil ◽  
Raw Materials ◽  
Decomposition Temperature ◽  
Thermal Decomposition Temperature ◽  
Dyeing Property ◽  
Ring Opening Reaction

The silicone succinate surfactant (PMPS) was synthesized by ring-opening reaction using polyether alcohol amine modified polysilosane (PAPS) with maleic anhydride (MA) as the raw materials, and p-toluenesulfonic acid (PTSA) was used as the catalyst. Sulfated castor oil and sulfated rapeseed oil were combinated with PMPS to prepare a new leather fatliqour (PMPSF) composed mainly of PMPS. The molecular structure of PMPS was characterized by FTIR spectra; the thermal properties of PMPS was characterized and analyzed by TGA. PMPSF was used in sheepskin wet blue leather and compared with oxidative sulfited vegetable oils (L-3) and RF-1 fatliquor; the waterproof and mechanical properties of the leather were measured. The results show that the thermal decomposition temperature of PMPS is 192.8°C. Fatliquor PMPSF provids a good level-dyeing property, the leather oiled by it has good flexibility and fullness, the waterproofness and mechanical properties of leather are also good. Moreover, compared with the leather fatliquored by L-3, the thickening rate of leather oiled by PMPSF reaches 13.7%.

scholarly journals Large, Rapid Swelling of High-cis Polydicyclopentadiene Aerogels Suitable for Solvent-Responsive Actuators

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1033 ◽  
Author(s):  
Despoina Chriti ◽  
Grigorios Raptopoulos ◽  
Benjamin Brandenburg ◽  
Patrina Paraskevopoulou
Keyword(s):  
Molecular Structure ◽  
Organic Solvents ◽  
Catalytic System ◽  
Chemical Sensors ◽  
Material Properties ◽  
Open Porosity ◽  
Ring Opening ◽  
Chemical Structure ◽  
Diffusion Distance ◽  
Metathesis Polymerization

High-cis polydicyclopentadiene (PDCPD) aerogels were synthesized using ring opening metathesis polymerization (ROMP) of dicyclopentadiene (DCPD) with a relatively air-stable ditungsten catalytic system, Na[W2(μ-Cl)3Cl4(THF)2]·(THF)3 (W2; (W3W)6+, a′2e′4), and norbornadiene (NBD)as a co-initiator. These aerogels are compared in terms of chemical structure and material properties with literature PDCPD aerogels obtained using well-established Ru-based alkylidenes as catalysts. The use of NBD as a co-initiator enhances the degree of crosslinking versus the more frequently used phenylacetylene (PA), yielding materials with a controlled molecular structure that would persist solvent swelling. Indeed, those PDCPD aerogels absorb selected organic solvents (e.g., chloroform, tetrahydrofuran) and swell rapidly, in some cases up to 4 times their original volume within 10 min, thus showing their potential for applications in chemical sensors and solvent-responsive actuators. The advantage of aerogels versus xerogels or dense polymers for these applications is their open porosity, which provides rapid access of the solvent to their interior, thus decreasing the diffusion distance inside the polymer itself, which in turn accelerates the response to the solvents of interest.

Sign in / Sign up

Export Citation Format

Share Document