INDUSTRIAL AND ENGINEERING CHEMISTRY
2260
TABLE XVII. SUNM.4RIllED SOLVEKT AND FREEZE RESISTANCE (Continued)
Monomers BD/S/MIK
BD/MIK BD/MIK
Monomer Ratio
Po!ymerization Temp.,
Emulsion Polymere 67/23/10 62/23/10 57/23/20 52/23/25 42/23/35 80/20 95/5
90/10 90/10 85/15
s0/20 80/20
’ F.
Gehman
InT , ~ ~Vol. creaSea
VaJue C.
-
COR’CLUSIONS 43 34
163 130
-2 49
56 180
86 86 104
70 GO 57
317 244 218
104 86
54 51
41
41 43
238 152 145 144
122
:,”
75/25
41 104
BD/DCBD
85/15 85/15)
122
BD/DCBD
85/15
122
90/10
122
95/5
122
50 70 64 69 66 62 67 70
85/15
122
72 69
141 95 130 125 163 141 129 135 135 130
72
199
67 59 51 46
205 192
90/10
85/15 80/20 95/5 90/10 85/15
BD/TCE BD/MCDFE BD/DCDFE BD/IBM BD/P-EEA
122
~
41
~
75/25 70/30 90/10 85/15 70/30 75/25 90jl0 70/30 70/30 20/50 ,0/25/5 50/45/5 50/40/10 50/30/20
41
i1 1
50/40/10 50/30/20 50/20/30
75/25 BD/S copolymer. The resistance to oils and solvents of the experimental polymers mas relatively unaffected by an increase in the styrene charge (Figure 14). As expected, the Alfin polymers containing oil were poorer than Paracril 18-80 with respect to resistance to oils and solvents.
(7 days a t 77’F),%
80/20
BDIBAP
Vol. 46, No. 10
39
167
;g
g;.54 68
;169 ge; 169
146 180
122
74 70 60 51 60
20.3 205 169 163 192
41
66
41
63 5? 50
173 146 163
104
;; 33
120 86 82 56
47
g
125
52
105
39
104
149
An examination of a large number of elastomers (summarized in Table XVII) revealed that Alfin catalyzed polybutadiene and emulsion copolymers of butadiene with relatively small proportions of acrylonitrile and large proportions of methyl isopropenyl ketone exhibited minimum dimensional changes on prolonged contact with the test oil and solvents. The oil and solvent reEistance of these polymers was comparable to that of Paracril 18-80. However, the flexibility a t low temperatures of the acrylonitrile and methyl ieopropenyl ketone polymers was entirely unsatiefactory. Alfin-catalyzed polybutadiene possessed the requisite freeze resietance but, unfortunately, the compounding of Alfin polybutadiene and mixing of this material in conventional equipment have presented processing problems. LITERATURE CITED
(1) Bartholomew, E. R., Rubber A g e , 72, 84 (1952). (2) Duke, K. G., and Mitchell, W.A., I n d i a Rubber W o r l d , 128,485 (1953). (3) Hohn, F. J., Martin, R. E., and associates, presented at the 122nd lIeeting, B C S , Atlantic City, Tu’. J., September 1952. (4) Laundrie, R. F., Feldon, M., and Rodde, A. L., IND. E m . CHEN., 46, 794 (1954). (5) Marvel, C. S., Clarke, K. G., and associates, Ibid., 45, 2090 (1953). (6) Marvel, C. S . , Fukuto, T. R., and associates, J . Polymer Sci., 8, 599 (1952). (7) Marvel, C. S., Menikheim, V. C., and associates, Ibid., 10, 39 (19531. (8) hlarvel, C. S., Peterson, W. R., and associates, IND.ENO. CHEM.,45, 1532 (1953). (9) Marvel, C. S., Kllliams, J. R., and Baumgarten, H. E., 9. Polymer Sci., 4, 583 (1949). (10) hIoche1, W. E., Salisbury, L. F., and associates, IND. EXQ. CHEM., 40, 2285 (1948). (11) Moll, R. A, Honlett, R. AI,, and Buckley, D. J., I b i d . , 34, 1284 (1942).
(12) Postelnek, W., Chem. Eng. News, 31, 1958 (1953). (13) Saloinon, A, J . Polymer Sei., 3, 32 (1948).
100 86
RECEIVED for review U a r c h 19, 1954.
Alfin Polymers BD BD/S/white oil
100 75/25/33 75/25/33
100
47-126 88-114 124-130
70 45 30
47-125
67 68
%/S
60
59
86
80/20
1
77.5/22.5, 75/25 J
BD/Circ.-2XH BD/S/Circ.-BXH
100/49 97.5/2.5/52 95/5/47 92.5/7.5/53
90/10/52
87.5/12.5/55 a 85/15/82 82.5/17.5/55 80/20/53 77.5/22.5/55 77.5/22.5/76
?53; 50 45 44 40
5G
115 160 44 100 125 146 152 163 lfi3 163 163
193 193
59
looc
57 55 52
115 l5 130’
BQ .37
2;
44 43 38 40 36
l00C 110:
~~~~
120 135 120~ 135 l l 0 C
A C C E P T E D April 5, 1954. Work performed as a part of the research project sponsored by the Reconstruction Finance Corp., Office of Synthetic Rubber, in connection with t h e government synthetic rubber program.
Evaluation of Organic Fluorine cornp o ~ d for s Use in Military AircraftCorrection In the article “Evaluation of Organic Fluorine Compounds for Use in Military Aircraft” [IND. EKG.CHEU.,45, 2283 (1953)], changes are given for the boiling point, peak in the flammability curve, and order of effectiveness on both a volume and weight basis of bromotrifluoromethane in Table I. The authors are indebted to J. E. Malcolm, Engineer Research and Development Labs., Fort Belvoir, Ya.! for calling attention t o the errors in the original table. B.P., O C .
a In mixture of 60% iso-octane, 5% benzene, 15% xylene, and 20% toluene, by volume. b 60/40 iso-octane/toluene, b y volume. Immersed for 9 days.
CFaBr BromotrlAuoromethane -57 WRIQHTAIR DEVELOPMEKT CEUTER AIR FORCE BABE,
WHIGAT-PATTERBOX
peak in Order of Effectiveness Volume Weight Flamm. basis basis Curve. % 3 2
HAROLD ROSENBERQ OEIO
