Abstract

In this paper, we discuss the durability potential of silyl terminated polyacrylate based construction sealants. The durability and performance of a silyl terminated polyacrylate (STPA) based construction sealant have been evaluated in comparison to a typical silyl terminated polyether (STPE) and a silicone sealant in order to demonstrate the potential of the STPA sealant as a high durability, high performance construction sealant that is also suitable for glazing applications. The polyacrylate backbone of STPA polymer has higher durability, especially UV stability and heat resistance, than the polyether one of STPE polymer as shown by accelerated weathering tests using carbon-arc or superhigh irradiance xenon-light sources. Adhesion of the STPA sealant on glass was retained even after 10,000 h exposure to superhigh irradiance xenon-light [180 W/m2 (300–400 nm)]. The performance of the STPA based sealant has been compared to that of the STPE based sealant by testing according to several industrial International Organization for Standardization (ISO) and Japanese Industrial Standard (JIS) standards. The STPA based sealant conforms to a higher durability class specification than the STPE sealant, for example, the requirements of class 10030 are passed with the STPA sealant, while the STPE sealant passes only class 9030 as stipulated in JIS A 5758. Furthermore, a cyclic movement test of the STPA based sealant in a compression-extension machine shows no damage to the sealant even after 200,000 cycles of ±40 % movement at room temperature. This performance is much better than that of sealants based on other materials, such as STPE, polyurethane, polysulfide, and silicone. These evaluations suggest a high potential of STPA based sealant as durable elastomeric joint sealant, which can be used on a glass, including photocatalytic self-cleaning glass, which functions by decomposing organic materials and by providing a superhydrophilic surface.

Issue Section:
Research Papers
Keywords:
telechelic polyacrylate, silyl terminated polyacrylate, expansion-compression cycle test

References

1.
Isayama
,
K.
, “
A Review of Telechelic Polymers Produced by Living Polymerization Technologies for Adhesives and Sealants
,”
Proceedings of the World Adhesive Conference and Exposition
, April 20–23,
2008
, Miami, FL,
The Adhesive and Sealant Council
,
Bethesda, MD
.
2.
Muramatsu
,
E.
, “
Silyl-Terminated Polyethers Sealant Durability Update
,”
Proceedings of the International Convention of the Adhesive and Sealant Council
, April 13–16,
2002
, Los Angeles, CA,
The Adhesive and Sealant Council
,
Bethesda, MD
.
3.
JIS A 5758, Japanese Industrial Standard regarding sealants for sealing and glazing in buildings.
4.
Nakagawa
,
Y.
, “
Commercialization of Telechelic Polyacrylates Prepared by ATRP
,” American Chemical Society, Spring Meeting, Anaheim, CA, March 29,
2004
.
5.
Nakagawa
,
Y.
, “
Development of New Curable Liquid Telechelic Polyacrylate
,” American Chemical Society, Spring Meeting, March 29,
2004
, Anaheim, CA.
6.
Nakagawa
,
Y.
, “
Development of Telechelic Polyacrylate: Features of Structure and Property
,” Adhesive and Sealant Council, Fall Convention, September 19–22,
2004
, Pittsburgh, PA.
7.
Masaoka
,
Y.
,
Nakagawa
,
Y.
,
Hasegawa
,
T.
, and
Ando
,
H.
, “
New Durable Sealant of Telechelic Polyacrylate
,”
J. ASTM Int.
 1546-962X, Vol.
3
, No.
10
, Paper ID JAI100450.
8.
Nakagawa
,
Y.
,
Bosui Journal
, Vol.
6
,
2008
, pp.
32
–
36
.
9.
Matyjaszewski
,
K.
 and
Xia
,
J.
,
Handbook of Radical Polymerization
,
K.
 
Matyjaszewski
 and
T. P.
 
Davis
, Eds.,
Wiley
,
New York
,
2002
, p. 523.
Google Scholar
Crossref
Search ADS
 
10.
Kato
,
M.
,
Kamigaito
,
M.
,
Sawamoto
,
M.
, and
Higashimura
,
T.
, “
Polymerization of Methyl Methacrylate with the Carbon Tetrachloride/Dichlorotris-(triphenylphospine)ruthenium (II)/Methylaluminum Bis(2,6-di-tert-butylphenoxide) Initiating System: Possibility of Living Radical Polymerization
,”
Macromolecules
 0024-9297, Vol.
28
,
1995
, pp.
1721
–
1723
. https://doi.org/10.1021/ma00109a056
Google Scholar
Crossref
Search ADS
 
11.
Wang
,
J. S.
 and
Matyjaszewski
,
K.
, “
Controlled/"Living" Radical Polymerization. Atom Transfer Radical Polymerization in the Presence of Transition-Metal Complexes
,”
J. Am. Chem. Soc.
 0002-7863, Vol.
117
,
1995
, pp.
5614
–
5615
. https://doi.org/10.1021/ja00125a035
Google Scholar
Crossref
Search ADS
 
12.
Test method: a piece of cured polymer in a metal-net bag was immersed in toluene for 1 day, then taken out, and dried completely, and the weight change from the original was measured.
13.
Koike
,
T.
, “
Development and Performance of Glazing Sealant for Photocatalyst Cleaning Sealant
,”
Bosui Journal
, Vol.
6
,
2008
, pp.
38
–
41
.
14.
Kano
,
S.
, “
Commercialization and Performance of Telechelic Polyacrylate Sealant
,”
Bosui Journal
, Vol.
6
,
2008
, pp.
42
–
45
.
15.
JIS A 1439, Japanese Industrial Standard regarding testing methods of sealants for sealing and glazing in buildings.
16.
Tanaka
,
H.
,
Makino
,
M.
, and
Kusumi
,
A.
, Summaries of Technical Papers of Annual Meeting of the Architectural Institute of Japan, Vol.
A-1
,
2006
, pp.
1109
–
1110
.
This content is only available via PDF.
All rights reserved. This material may not be reproduced or copied, in whole or in part, in any printed, mechanical, electronic, film, or other distribution and storage media, without the written consent of ASTM International.
You do not currently have access to this content.