mtjliors thank Mr. 1). Green for prepariiig :,oiii(: of the clcuteratrd

8604

sO T E S

VOL.

2:i

TABLE I1 G-VALI~ES FOR GASES FROM COPOLYMERS~ OF S T Y R E S E - ~ , - ~ ~ K MXTHACRYLATE THYL ANU STYRESE-~~-R~ETHYI, ACRYLATE*;I)OSE 1.0 x 107 1l.m G(Gas) From Sondeuterated Copolymerc

G(tln-Gas/dl-Gai.) _._____ -

. p-di-

-..-

Copolymer

C'opolynirr

C'opol~iller

Isotope b;ff ectd

18 (19)

96 (34)

:3:3 ( 35)

7.0

23 ( 2 3 )

:36 (36)

69 (62)

7.0

li(l2)

:34 (:30)

wrie-nirthyl acrylate copolymer (Table IT). The latter is a crosslinking to collect thew compounds, wit'h rclevuiit dat:k, system,2in which protection against crosslinking is afforded under their correct designatio11 as 4,4'-bisdialkylby the styrene groups prescwt. \Vhile t h r g:is yields of this aminostilbeiies (I),Thc compoiuiids i i r ~;irr:iiigd i i i c o p o l p e r depend not onlj- on its composition, but 011 thrs Table I, which also iiirhidw two h(>tc?i,oc.yc.lic. degree of crosslinkiiiy ( t h r uiiirr:idi:ttcd copolynier is morv of st8rucaturc (11). With o i w radiation sensitive than the crossliiiked product) the ratio dialkvlaminostilbeii~~s wcept#ionthmc st,ilhrlie dprirat ive:, havo i i o t b ( : ( ~ i i ( :(do-gas/di-gas) clearly indicates the significance of til)straction react,ions in the radiation chemistry of the copoly- n w i i tioiitd iii thc l i t ( u tI I ~ C . mer. The implication of thrse conclusions is t h a t radiltt,iuii initiated damage noted in organic polymers is not a siinpli* function of the radiation stxhilitj- of a particular bond in tllc Inolecule.

~~c/znowledyme,if. The :mtjliors thank Mr. 1). Green for prepariiig :,oiii(: of the clcuteratrd polymers. DEPARTMENTb 0 P'

c I4 15 \ I 1h T R Y

1 S I1 .-\S .I1. Y T I ('.\ L

SI$H\'1 I ' BS

YCIESTIFIC LABOR.ITOHY FORD MOTORCo. IIEBRBORN, ~ ~ I < ' l - I

____

(8) -pIrratliatioii of :i n i i k t i i r ( s oi' l)o1ystyrt~iie-dlm d pul>-iiicthyl niethacrylatr. o 1 i t : i i i i i ~ ~ 11). l i,o!)rrc.i:iitHtioii frorn :t soliition of thew siil)st:tii1aij-.. :il'forilivl 11 I ) (froin polystyr c ~ 1 i c 4 :is ~ ) thc o i i l ) . driit(ar:tt(%(lsl)cti*ic's.

'l'he coniyorind obtained by the actioii of tiii aut1 acid on p-dime t,hylaiiiinoben za ldeh vdt: \v:ih cltscribcd as a,6-bisdi1~iethylainiiioaiit~hrzl~c:c?ac

t i ydroahlor ic

s E: 1'TE >I u 1,: I < 1 iI

3605

N o'rl,:S

Calcd. Fortn1tla

C

H

S

_

81 !) 81 f

I

\I 4

8 T

8

!)

!)

5 9 5 -

C -

-.

S 9.0 9.4

64.8

9.0 8 7 8 7 5 T

7:3.8 80.4

0.0 0 8

8.; 6.0

8 0

!I 0

8;