When the chain length of alkoxy group
of the adipates increases, diethyl adipate, dimethyl adipate and dipropyl adipate can depress the saturation vapor pressure lower than that of gasoline, among which dipropyl adipate is the most effective one.
The weight loss below 200[degrees]C was attributed to the removal of physically adsorbed water and any remaining solvent molecules from the synthesis and functionalization processes, as well as nonhydrolysed alkoxy groups
from the SiNP surface.
The results show that the length of alkoxy group
effects on the phase stability of methanol-gasoline significantly.
As the carbon atoms of the alkoxy group
increase over 4 the esters can stabilize the methanol-gasoline at low temperature.
As a rule, larger alkyl groups on a silane will have lower VOC, and a higher alkoxy group
will have lower VOC.
The lower yields and intrinsic viscosity values (Table 1) could be a result of chain transfer between polymer and monomer through the alkoxy group
attached to the P atom (37).
Summary: This invention provides a composition comprising a mixture of (a) a halogenated elastomeric copolymer of a [C.sub.4] to [C.sub.7] isomonoolefin and a para-alkylstyrene; and (b) at least one silica or clay filler which has been contacted with at least one aminosilane containing at least one [C.sub.1] to [C.sub.4] alkoxy group
and at least one primary, secondary or tertiary amine group, the particulate filler material present in the composition at a level of from 0.1 to 100 parts by weight per 100 parts by weight of the elastomeric copolymer.
The alkoxy group
was for the most part methoxy, although the aminosilane (Dow Corning Z-6011/Silquest A-1100) did offer ethoxy.
When compared to the ATR spectrum of the silane coupling agent, the new absorption peaks around 28402940 [cm.sup.-1] are reasonably attributed to the deposition of the silane coupling agent on the concrete surfaces, due to the stretching vibration of C--H in the alkoxy group
from the coupling agent.
One end of the alkoxy group
reacts with the silanol group on the silica surface via a hydrolysis mechanism (refs.
It is well known that NFs contain bound moisture which could hydrolize the coupling agent typically represented by the formula YRSi[X.sub.3], (where X is a hydrolizable alkoxy group
, Y is a functional group, and R is a small aliphatic chain).
In this reaction, the end group of the ethylenic polymer will be the alkoxy group
from the peroxide (figure 7).