Networked silicones and related compositions, methods, and compounds
A networked silicone is disclosed. The networked silicone comprises crosslinked strands of looped organosilicon compounds. A composition for preparing the networked silicone is also disclosed, and comprises (A) a looped organosilicon compound, (B) a crosslinking organosilicon compound, and optionally (C) a catalyst. Additionally, a method of preparing the networked silicone is disclosed, and comprises reacting the looped organosilicon compound (A) and the crosslinking organosilicon compound (B), optionally in the presence of the catalyst (C), to give the networked silicone. A reaction product comprising the networked silicone is also disclosed. The reaction product is prepared from the composition and/or in accordance with the method, and may be a cured product. Additionally, a composite article and a method of forming the same are disclosed. The composite article is formed by disposing a networked silicone composition on the substrate and curing the networked silicone composition, thereby preparing the composite article.
1. A composition for preparing a networked silicone, comprising:
(A) a looped organosilicon compound having the general formula (I):
[R 1 3 SiO 1/2 ] a [R 2 2 SiO 2/2 ] b [R 1 SiO 3/2 ] c [X] d [Z] e (I),
where each X is a looped moiety having the general formula (II):
wherein each Y is an independently selected siloxane moiety having the formula [R 2 i SiO (4-i)/2 ] h ; each Z is an independently selected organic moiety; each R 1 is an independently selected hydrocarbyl group; each R 2 is independently R 1 or a cross-linkable group, with the proviso that at least one R 2 is the cross-linkable group; each D is an independently selected divalent linking group; subscripts a, b, c, d, and e are each mole fractions such that a+b+c+d+e=1, with the provisos that 0≤a<1, 0<b<1, 0≤c<1, 0<d<1, and 0≤e<1; subscripts f and g are each independently 0 or 1 with the proviso that f+g>0 in each looped moiety X; each subscript h is independently from 1 to 1000; subscript i is independently selected from 1, 2, and 3 in each moiety indicated by subscript h; and moieties indicated by subscripts a, b, c, d, and e may be in randomized or block form in the looped organosilicon compound (A); and
(B) a crosslinking compound having the general formula R 3 -L-R 3 , where L is a linking group and each R 3 is an independently selected functional group reactive with the cross-linkable group R 2 of the looped organosilicon compound (A); and, optionally,
(C) a catalyst.
2. The composition of claim 1 , wherein the cross-linkable group R 2 comprises a functional group that is: (i) hydrosilylatable; (ii) condensable; (iii) displaceable; (iv) nucleophilic; (v) electrophilic; or (vi) a combination of (i)-(v).
3. The composition of claim 1 , wherein: (i) each R 1 is methyl; (ii) each D is selected from —(CH 2 ) 2 —, —(CH 2 ) 3 —, —CH(CH 3 )CH 2 —, and —CH 2 CH(CH 3 )CH 2 —; (iii) subscript e is 0; (iv) each subscript f is 0; (v) each subscript g is 1; (vi) each subscript h is independently from 50 to 1000; (vii) each cross-linkable group R 2 of the looped organosilicon compound (A) is an alkenyl group or H; or (viii) any combination of (i)-(vii).
4. The composition of claim 1 , wherein linking group L comprises: (i) a siloxane segment; (ii) an organic segment; or (iii) both (i) and (ii).
5. The composition of claim 1 , wherein each functional group R 3 is: (i) hydrosilylatable; (ii) condensable; (iii) displaceable; (iv) nucleophilic; (v) electrophilic; or (vi) a combination of (i)-(v).
6. The composition of claim 1 , wherein: (i) linking group L is a siloxane segment having the formula [R 1 2 SiO 2/2 ] j , where each R 1 is an independently selected hydrocarbyl group and subscript j is from 20 to 500; (ii) each R 3 is an alkenyl group or H; or (iii) both (i) and (ii).
7. The composition of claim 1 , further comprising: (i) a carrier; (ii) a filler; (iii) a filler treating agent; (iv) a surface modifier; (v) a surfactant; (vi) a rheology modifier; (vii) a viscosity modifier; (viii) a binder; (ix) a thickener; (x) a tackifying agent; (xi) an adhesion promotor; (xii) a defoamer; (xiii) a compatibilizer; (xiv) an extender; (xv) a plasticizer; (xvi) an end-blocker; (xvii) a reaction inhibitor; (xviii) a drying agent; (xix) a water release agent; (xx) a colorant; (xxi) an anti-aging additive; (xxii) a biocide; (xxiii) a flame retardant; (xxiv) a corrosion inhibitor; (xxv) a catalyst inhibitor; (xxvi) a UV absorber; (xxvii) an anti-oxidant; (xxviii) a light-stabilizer; (xxix) a catalyst, procatalyst, or catalyst generator; (xxx) an initiator; (xxxi) a photoacid generator; or (xxxii) a combination of (i)-(xxxi).
8. A cured product of the composition of claim 1 .
9. A method of forming a composite article comprising a networked silicone, said method comprising:
disposing a composition on a substrate; and
curing the composition to give the networked silicone on the substrate, thereby forming the composite article;
wherein the composition is the composition of claim 1 .
10. A composite article formed according to the method of claim 9 .