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Toward Polymer Coatings with Easy Ic...

Virginia Commonwealth University.

Toward Polymer Coatings with Easy Ice Release.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Toward Polymer Coatings with Easy Ice Release.
作者:	Wang, Chenyu.
面頁冊數:	172 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-02(E), Section: B.
附註:	Adviser: Kenneth J. Wynne.
Contained By:	Dissertation Abstracts International76-02B(E).
標題:	Chemical engineering.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3639851
ISBN:	9781321247336

Toward Polymer Coatings with Easy Ice Release.
Wang, Chenyu.

Toward Polymer Coatings with Easy Ice Release. - 172 p.

Source: Dissertation Abstracts International, Volume: 76-02(E), Section: B.

Thesis (Ph.D.)--Virginia Commonwealth University, 2014.

This item must not be sold to any third party vendors.

Minimizing adhesion of ice has been the subject of extensive studies for applications such aircraft wings, wind turbine blades spacecraft, power transmission wires, while a growing interest concerns coatings for aerospace applications. The work described here describes progress for coatings and ice release test method development over the last few years. Major achievements include: (1) New Rigid Adherent-Resistant Elastomers (RARE), (2) A new Epoxied Cylinder (EC) adhesion test, (3) Validation of an ice release test, and (4) Study of ice adhesion strength on coating thickness for a PDMS elastomer.

ISBN: 9781321247336Subjects--Topical Terms:

206267
Chemical engineering.

Toward Polymer Coatings with Easy Ice Release.
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100 1 $a Wang, Chenyu. $3 708761
245 1 0 $a Toward Polymer Coatings with Easy Ice Release.
300 $a 172 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-02(E), Section: B.
500 $a Adviser: Kenneth J. Wynne.
502 $a Thesis (Ph.D.)--Virginia Commonwealth University, 2014.
506 $a This item must not be sold to any third party vendors.
520 $a Minimizing adhesion of ice has been the subject of extensive studies for applications such aircraft wings, wind turbine blades spacecraft, power transmission wires, while a growing interest concerns coatings for aerospace applications. The work described here describes progress for coatings and ice release test method development over the last few years. Major achievements include: (1) New Rigid Adherent-Resistant Elastomers (RARE), (2) A new Epoxied Cylinder (EC) adhesion test, (3) Validation of an ice release test, and (4) Study of ice adhesion strength on coating thickness for a PDMS elastomer.
520 $a Rigid Adhesion-Resistance Elastomers (RARE) are comprised of 3F 1 terminated with triethoxysilane moieties and linear 3F polyurethane (U-3F). Hybrid compositions U-3F-x are designated by polyurethane weight percent "x". Interestingly, RARE coatings spontaneously "self-stratify" during coating deposition and cure. Cured RARE coatings are comprised of (1) a nanoscale surface layer with low work of adhesion, (2) a low modulus mesoscale and (3) a tough U-3F bulk, where "Mesoscale" is defined as a near surface region with a depth &sim; 1000 nm.
520 $a An EC adhesion test was developed to evaluate the fouling release characteristics of RARE. EC adhesion testing was devised by using the commercially available instrument, TA RSA-3. The TA RSA-3 is well suited for these tests as the 3.5 kg load cell facilitates accurate measurements. This test gives peak force (Ps) for EC removal. A striking compositional dependence was found for EC adhesion. A U-3F-50 hybrid coating had the lowest adhesion (Ps = 0.078 MPa) with good toughness (6.2 MPa). Bulk and surface characterization together with adhesion measurements established U-3F-x hybrid coatings, and U-3F-50 in particular, as new fluorous rigid adherent-resistant elastomers (RARE) that are tough, oil resistant, and optically transparent.
520 $a Inspired by the Epoxied Cylinder (EC) adhesion test, a laboratory method for ice adhesion measurement with a commercially available instrument was established in the Wynne Laboratory. This is the first laboratory ice adhesion test that does not require a custom built apparatus. The temperature controlled chamber on TA RSA-3 is an enabling feature that is essential for the test. The method involves removal of an ice cylinder from a polymer coating with a probe and the determination of peak removal force (Ps). To validate the test method, the strength of ice adhesion was determined for a prototypical glassy polymer, poly(methyl methacrylate). The distance of the probe from the PMMA surface has been identified as a critical variable for Ps. The new test provides a readily available platform for investigating fundamental surface characteristics affecting ice adhesion. In addition to the ice release test, PMMA coatings were characterized using DSC, DCA and TM-AFM.
520 $a This new laboratory ice release test was then employed to obtain the thickness dependence of ice adhesion for Sylgard 184, a filled polydimethylsiloxane elastomer. A correlation between ice adhesion and coating thickness (t) was found, that follows a relationship developed by Kendall over 40 years ago for removal of a rigid object from an elastomer. In particular, a nearly linear relationship between peak removal stress (Ps) and 1/t1/2 was found, with Ps decreasing from 550 kPa to 100 kPa with coating thickness increasing from 12 mum to 800 mum. While work of adhesion, which is related to surface free energy, is recognized as an important factor that can affect ice release, the results reported herein show that coating thickness can override this single parameter for elastomeric substrates. Base on the result, a general model is proposed for the removal of ice from low modulus elastomers (&sim;10 MPa).
590 $a School code: 2383.
650 4 $a Chemical engineering. $3 206267
650 4 $a Polymer chemistry. $3 708579
650 4 $a Materials science. $3 221779
650 4 $a Plastics. $3 182997
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690 $a 0495
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690 $a 0795
710 2 $a Virginia Commonwealth University. $b Engineering. $3 708762
773 0 $t Dissertation Abstracts International $g 76-02B(E).
790 $a 2383
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3639851