Abstract:This paper gives a comprehensive introduction of the high performance rubber sealing materials developed
by Aerospace Research Institute of Materials and Processing Technology (ARIMPT) and also a brief description
of several typical application examples in aerospace industry.

Abstract:Fluorinated polymers exhibit a range of outstanding properties such as chemical resistance, high-temperature
stability and low surface energy. The fluorinated polymers developments have always been closely linked to
military and strategic applications. In view of the author’s research interest, this review takes a critical look at recent
advances in synthesis of fluorinated polymers, fluorinated elastomers, fluorinated oil and environmental friendly fluorinated
polymers.

Abstract:The recent development of the thin sheet polyimide porous material is reviewed. The product types,
properties and application of the thin sheet polyimideporous material are introduced and its future research direction as
well as the development trends is also pointed out. The thin sheet polyimide porous materials will gradually replace
traditional MLI materials as a gasket in the multi-layer insulation system of spacecraft.

Abstract:Reusable and hypersonic vehicles pose an extraordinary challenge for seal structures. Airframes and
engines require lightweight, high-temperature seal structural that can withstand the extreme environment of hypersonic
flight. This paper reviews relevant seal technology for typical vehicles (e. g. Space Shuttle, X-38 and X-51) and
presents several seal technologies for future hypersonic vehicles, foucs on high-temperature seal structural of the space
shuttle TPS, vehicle penetrations and control surfaces.

Abstract:Research progress on storage aging tests of silicone rubber for spaceflight application was reviewed
and analyzed in this paper. There are three problems in the present storage aging researches. Firstly, accelerated aging
tests (be abbreviated to AAT) were largely conducted but natural aging tests (be abbreviated to AAT) were conducted
much fewer. Secondly, AAT with a single accelerated stress was largely conducted but AAT with multi accelerated
stress was conducted much fewer. Finally, the variations of macroscopical performances had attracted too much
attention but the aging mechanism and variations of microcosmic structures were concerned too little. Based on the
problems mentioned above, three research fields including data accumulation in AAT and its applications, AAT with
multi accelerated stress and aging mechanism of silicone rubber should be emphasized in the future researches.

Abstract:The concept of “Shear Neutral Area” was proposed for constrained damping plate compared to “Shear
Neutral Axis” for beam. Based on Deformed Energy Principle, structural loss factor was analyzed by optimizing the
thickness of damping layer, and then tests were executed. Results show when damping layer is thin, the thickness of
damping layer and constrained layer are consistent to actual measurement, indicating the rationality of the analysis
method

Abstract:Battery failed to work through vibration test as the response exceeded its tolerance. By FEM method,
constrained damping technology was optimized to redesign the battery bracket, and then tests were performed. Results
show that the battery’s times of resonance apex of power spectrum density dropped from 28 to 14 after bracket was
treated by constrained damping layer, and the battery worked successfully, indicating the efficiency of constrained
damping technology when used to isolate vibration for structures such as board and shell.

Abstract:Electric equipment suffers dynamic load such as vibration and shock at work, as a result, failing to
work normally as the response exceeded its tolerance, thus the damping design was applied to reduce vibration and absorb
shock. Tests results show that vibration reduction efficiency is larger than 55 percent,magnification of shock response
is less than 1. 6, and the work environment of electric equipment is improved efficiently.

Abstract:Inertial measurement units often suffer from harsh shock environment. By theory analysis and FEM, a
new type of damper was developped. While the new type of damper was installed, test results showed that the shock
response descended from 100 g to 30. 3 g, indicating the new damper is of excellent shock resistance ability and anti
-vibration at the same time.

Abstract:In order to solve the difficult separate problem of a type of plug seal structure, the finite element analysis
was used to calculate the interaction pressure of seal zone of “Y”, “L”, “T” and “O” seal ring, The sealing experiment
and separating experiment has been conducted to prove the finite element results. The results show that the
sealing of shaped structure is finer and the structure can lower the friction of plug , which will lead to the separation
flexible.

Abstract:In this paper, it was reported that the Ni3Al matrix composites have self-lubricating properties at a wide
temperature range from room temperature to 1 000℃. This composite was selected based on the premise that Ni3Al intermetallics
with favorable strength and oxidition resistance would act as high temperature matrix; silver and fluorides reduced
friction coefficient at low and high temperatures, respectively. The composites were fabricated by powder metallurgy
route, and their mechanical properties at elevated temperatures were investigated. Moreover, the tribological tests
at different temperature and speed conditions were conducted on an HT-1000 ball-on-disk high temperature tribometer
and a pin-on-disk high speed tribometer, respectively. It was found that the Ni3Al matrix composites have excellent mechanical
performance (compressive strength 40 to 45 MPa) and self-lubricating properties (friction coefficient 0. 28 to
0.25), and provide the steady and low friction coefficient under high load and speed conditions.

Abstract:In order to develop materials with good tribological behavior at a wide temperature range (especially
at high temperatures), a series of ZrO2 ( Y2O3 ) matrix composites which contain various of solid lubricants ( Mo、
MoS2、BaF2、CaF2、BaF2 / CaF2、CuO) were prepared by hot-pressing. Among them, ZrO2( Y2O3 ) -Mo-BaF2 / CaF2
composites show low friction coefficient in the range of 800 to 1 000℃. At 1 000℃, the friction coefficient is 0. 28
which is close to the engineering application value. The friction coefficients of the ZrO2(Y2O3) -MoS2 -CaF2 composites
are 0. 30 to 0. 20 when sliding against SiC in the range of 800 to 1 000℃. The ZrO2(Y2O3) -MoS2 -CaF2 composites
have good friction and wear performance over a wide temperature range. The excellent high-temperature tribological
behavior was mainly attributes to the high-temperature stability of the ZrO2 and the high lubricity of molybdate
which formed on the worn surface at high temperature.

Abstract:Carborane is an outstanding raw material for high temperature resistant. POSS is an anti-atomic oxygen
compound. In this paper, the above-mentioned two materials are chemically combined by hydrosilylation. Two
kinds of polymers are synthesized and the thermal properties are evaluated by TGA in air. TGA results show that the
materials exhibit excellent high-temperature resistant properties. These materials could be used as coatings of hypervelocity
vehicles.

Abstract:The relationship among the number of skein,twin screw extruder rotating speed,adding amount of
plastic and fiber content was studied in the process of production of fiber reinforced thermoplastic by twin screw extruder.
Fiber content could controlled precisely in the range of ±0. 1wt% by adjusting the three parameters forward.
When the twin screw extruder rotating speed and adding amount of plastic,or the number of skein and adding amount
of plastic were increased simultaneously, the output of extrusion was improved at the same multiple and the fiber content
maintained invariably. These method were efficient,feasible,accurate and controllable,and could be comprehended
easily by operator to direct practice.

Abstract:Using the methods of thermal twin roller mixing, the OMMT/ HNBR rubber were prepared. The dispersion
of OMMT in HNBR was enhanced by the preparations, thus good properties of HNBR were obtained. The results
of SAXS, SEM and TEM showed that the OMMT layers were intercalated in the HNBR matrix and formed a few
aggregations. DSC plots and cold-resistance coefficient results displayed that the addition of OMMT is not restricted
the chain segment motions of HNBR, but increased the density of filler networks which thus improved their low-temperature
elasticity. By the addition of OMMT into HNBR, the mechanical properties of nanocomposites increased.
However, when the content of OMMT was beyond 10 phr, the amount of their aggregations increased and thus the mechanical
properties slowly improved. DMA measurements showed that there are strong interfaces between HNBR and
OMMT which lead to high mechanical properties of HNBR. In contrast with pure HNBR, the incorporation of OMMT
is helpful to improve the oil-resistance of HNBR. Therefore, we believe that OMMT/ HNBR rubber is a high-performance
oil-sealing material at the low temperature.

Abstract:The influence of POE-g-MAH content and MAH grafting rate on the blends of PA66/ POE/ POE-g-
MAH were investigated. The brittle-ductile transition occurred when the content of POE-g-MAH changed from
10wt% to 15wt% in the blends. With increase of the content of POE-g-MAH, the notched impact strength and the
elongation at break of the blends increased significantly, while the tensile strength, bending strength and modulus declined,
the melt flow rate and the water absorption decreased. While in PA66/ POE/ POE-g-MAH blends, the brittle
-ductile transition occurred when the graft rate of POE-g-MAH changed from 0. 05wt% to 0. 2wt%. With the increase
of graft rate of POE-g-MAH, the notched impact strength and the elongation at break of blends increased,
while the tensile strength, bending strength and modulus, the water absorption did not change obviously, and the melt
flow rate decreased. SEM photographs and Molau compatibility experiment showed that, POE-g-MAH had a significant
effect both on the compatibility and toughness on PA66.

Abstract:In order to improve the damping properties of hydrogenated nitrilebutadiene rubber (HNBR ) ,3,9-
bis[ 1, 1-dimethyl-2{β-(3-tertbutyl-4-hydroxy-5-methylphenyl) propionyloxy} ethyl ] -2,4,8,10-tetraoxaspiro
[ 5, 5 ] -undecane (AO80) were added into it to prepare the vulcanized HNBR/ AO80 rubbers. The relationship
between the damping properties and micro-structure of this blending system was characterized by DMA & FTIR. Then
the stability of this system was studied by thermal treatment at 80℃. The results showed good damping property of this
blending system, which was due to the effect of intermolecular hydrogen bonds between the hydroxyl groups of AO80
and the nitrile groups of HNBR. But the damping property of this curing system become unstable after thermal treated
because of the self polymerization of AO80. With the increasing of thermal treated time, large number of AO80 formed
rich phase,crystallized,grewed up,then formed large crystallise aggregates.

Abstract:The curing characteristics of FM73M adhesive film was monitored by DSC and investigated under different
heating rates. According to the DSC graph, the theoretical parameters such as gelation temperature, peak temperature
and the kinetic model of FM73M adhesive film were acquired. And then 125±2℃ /90min is confirmed as the
actual curing of the film. The distribution of FM73M adhesive film in the PMI foam core and the interface between the
foam core and the film (interface wetting situation, porosity, defects) were observed by SEM. The adhesive mechanism
of PMI foam and FM73M adhesive film was analyzed.

Abstract:Fourier transform infrared spectroscopy was used to characterize the structure of the KH-550. The
bonding strength between Al and the adhesive was studied by the pretreatment with different concentration coupling agents.
The interface bonding of Al/ epoxy resin adhesive system was studied using SEM and RA-IR. It was found that
coupling agent had very strong hydrolysis ability and was able to increase the bonding strength 2 to 3 MPa.

Abstract:Thermal-oxidative aging experiments on butyl rubber were conducted, and structural evolutions of the
rubber during aging were traced by real time infrared technique,and the resulting data were analysized by a 2D correlation
spectroscopy analysis. The results suggest that free radicals derived from saturated C-H and C-C bonds which
are attacked by oxygen atoms form slowly at the early stage of thermal aging. And it is a key step to determine the reaction
speed. After that, the carbonyl species are generated rapidly, which results in formation of aldehydes, ketones
and esters etc. and finally by degradation and oxidative. Based on a full understanding on the thermal-oxidative aging
mechanism of butyl rubber, we constructed elementary reaction equations and furthermore, oxidation kinetic models
according to mass action law of each elementary equation. The aging rate ratio of room temperature to high temperature
is obtained by calculation of Matlab program. By fitting the curves described from the oxidation kinetic models with
the data from FTIR tracing experimental for the aging process, it is found that both changes have the same tendency,
which promises an excellent prospect for predicting lifetime of materials.

Abstract:Based on the data for accelerated life and natural storage life of six rubber sealing materials including
EPDM-8101, EPDM-8106, NBR-45713, NBR-5073, FKM-7103 and CR-4103, the accelerated factors were
calculated. The results indicate that excent FKM-7103, the accelerated factors are agree with Van′Hoff factor. The
accelerated factors of aging temperature can be used to predict storage life of rubber sealing materials instead of the accelerated
factors between accelerated life and natural storage life.