Synthesis and characterization of poly(methyl methacrylate)/polysiloxane
composites and their coating properties
ChengPeng Xing, Ting He, YinJie Peng, RuiHai Li
College of Polymer Science and Engineering, Sichuan University, Chengdu Sichuan 610065, China
Correspondence to: R. Li (E -mail: firstname.lastname@example.org)
A series of poly(methyl methacrylate) (PMMA)/polysiloxane composites and their coatings were prepared as designed. A
copolymer (PMMAVTEOS) containing methyl methacrylate (MMA) and vinyltriethoxysilane (VTEOS) was prepared by free radical
polymerization and then condensed with methyl triethoxysilane (MTES) to fabricate PMMA/polysiloxane composites; their corre-
sponding coatings were obtained via a curing process in an oven (at 75 8C). The polymers were characterized by gel permeation chro-
matography and Fourier transform infrared spectroscopy. The surface property, hardness, water contact angle, thermal stability, and
optical property of the coatings were investigated by scanning electron microscopy, pencil hardness testing, water contact angle test-
ing, thermogravimetric analysis, and ultraviolet–visible spectroscopy, respectively. The results showed that, after addition of MMA,
the pencil hardness of the coatings was reduced from 6H to 2H and the thermal stability decreased from 365 to 314 8C. However, it
increased the flexibility and adhesion properties (the water contact angle increased from 94.78 to 102.18). The transparent
PMMA/polysiloxane coatings showed excellent scratch resistance, a smooth surface, high thermal stability, and a strong adhesion
2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46358.
composites; mechanical properties; molecular recognition; optical properties; thermogravimetric analysis
Received 3 November 2017; accepted 8 February 2018
In recent decades, polysiloxane coatings
have attracted a great
deal of attention in both chemical and physical areas.
loxane coatings are always used for injection molding of optical
components with a microstructured surface, due to their unique
properties, such as extraordinary mechanical and optical perfor-
Unfortunately, a variety of promising
applications were limited by brittleness,
and changeable working conditions.
Hence, obtaining an outstanding performance that is synergisti-
cally derived from two or more components is a preferable
method for solving these problems by modifying the chemical
structure of polysiloxane.
Acrylic monomers are widely used
for their many specific properties, such as good film-forming
ability, transparency, gloss, and good cohesiveness.
Siloxane is a compound with the chemical formula (R
is either hydrogen or an organic group such as alkyl, alky-
lene, aryl, or arylene, and R
is always a methyl or ethyl group.
A sol–gel process is commonly used for polysiloxane synthesis
because of its advantages, such as simple and stable process, mild
reaction conditions, and stable product performance.
ous studies on siloxane sol–gel processing have indicated that the
hydrolysis and condensation can occur under chemical conditions
with water and acid or base catalyzer.
In particular, the type of
catalyst has an impact on the growth mechanism of the polysilox-
ane: weakly branched polysiloxanes are formed in acid-catalyzed
sols, while highly branched, compact polysiloxanes are formed in
In this study, we have selected methyl methacrylate (MMA) to
modify the polysiloxane, because it provides a good film-forming
ability, transparency, gloss, and good cohesiveness for the polysi-
Thus, the idea of preparing polysiloxane coatings
as described in this paper has broadened the thinking on polysilox-
ane preparation and the prospects for polysiloxane applications.
Methyl triethoxysilane (MTES, industrial grade) and vinyltriethoxy-
silane (VTEOS, industrial grade) were purchased from Guangzhou
Double Peach Fine Chemical Co. (Guangzhou, China). Acetic acid
(AcOH), isopropyl alcohol (IPA), methyl methacrylate, 2,2-azobisi-
sobutyronitrile (AIBN), and ammonia water (NH
OH, 28%) were
purchased from Chengdu Kelong Chemical Reagent Factory
(Chengdu, China). Unless otherwise stated, all of the chemicals are
analytical grade and used directly without further purification.
2018 Wiley Periodicals, Inc.
J. APPL. POLYM. SCI. 2018, DOI: 10.1002/APP.46358
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