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Article

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

1
Laboratory of Inorganic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece
2
Dräger Safety AG & Co. KGaA, Revalstraße 1, 23560 Lübeck, Germany
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(5), 1033; https://doi.org/10.3390/polym12051033
Received: 11 April 2020 / Revised: 24 April 2020 / Accepted: 28 April 2020 / Published: 2 May 2020
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. View Full-Text
Keywords: tungsten; metal-metal bonds; ROMP; dicyclopentadiene; aerogels; solvent-responsive; swelling tungsten; metal-metal bonds; ROMP; dicyclopentadiene; aerogels; solvent-responsive; swelling
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MDPI and ACS Style

Chriti, D.; Raptopoulos, G.; Brandenburg, B.; Paraskevopoulou, P. Large, Rapid Swelling of High-cis Polydicyclopentadiene Aerogels Suitable for Solvent-Responsive Actuators. Polymers 2020, 12, 1033. https://doi.org/10.3390/polym12051033

AMA Style

Chriti D, Raptopoulos G, Brandenburg B, Paraskevopoulou P. Large, Rapid Swelling of High-cis Polydicyclopentadiene Aerogels Suitable for Solvent-Responsive Actuators. Polymers. 2020; 12(5):1033. https://doi.org/10.3390/polym12051033

Chicago/Turabian Style

Chriti, Despoina, Grigorios Raptopoulos, Benjamin Brandenburg, and Patrina Paraskevopoulou. 2020. "Large, Rapid Swelling of High-cis Polydicyclopentadiene Aerogels Suitable for Solvent-Responsive Actuators" Polymers 12, no. 5: 1033. https://doi.org/10.3390/polym12051033

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