Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1980-04-30
1982-07-13
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 33, 528 35, C08G 7706
Patent
active
043395627
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to organo-silicon polymers and, more specifically, to a novel compound, viz. a high-molecular crystalline polymer with alternating dimethylene and methyl-substituted disilene units in the main chain and to a method for preparing same.
1. Description of the Prior Art
Such polymers and methods for preparing same have not been hitherto known.
2. Disclosure of the Invention
A high-molecular crystalline polymer with alternating dimethylene and methyl-substituted disilene units in the main chain has the formula: ##STR2## wherein n is an integer of from 800 to 1,000.
The polymer comprises a solid substance with the melting point of 113.degree. C. and the decomposition temperature (in the air) of 240.degree. C. The polymer is insoluble at a temperature within the range of from -70.degree. to +55.degree. C. in such solvents as alcohols (methanol, ethanol), ketones (acetone, methylethylketone), ethers and esters (diethyl ether, ethylacetate), halogenated hydrocarbons (carbon tetrachloride, chloroform, dichloroethane, trichloroethylene), paraffin (pentane, hexane, heptane, octane), naphthene (cyclohexane) and aromatic (benzene, toluene, o-, m-, and p-xylenes) hydrocarbons. The polymer swells in benzene, toluene, o-, m- and p-xylenes at the temperature of 55.degree. C. and it dissolves therein with increasing temperature to give viscous solutions. The polymer is resistant against concentrated aqueous solutions of acids (H.sub.2 SO.sub.4, HCl,HNO.sub.3) and alkalis (NaOH, KOH) and to the effects of light and moisture.
The polymer has a molecular weight of from 110,000 to 140,000.
The polymer is well machinable by cutting tools and mouldable by the hot-compression method. Articles manufactured from the polymer retain their shape for a long time at a temperature within the range of from -70.degree. to +95.degree. C. Furthermore, the polymer has good adhesive properties relative to glass.
Chemical structure and other properties of the polymer have been established through the data of its elemental composition given hereinbelow, as well as the data of spectral and physico-chemical methods of analysis.
Elemental composition (wt. percent) corresponds to that calculated for the fragment
______________________________________ ##STR3##
C H
______________________________________
Found, %: 50.01 11.12 38.76
Calculated, %:
50.00 11.11 38.89
______________________________________
In the IR spectrum of the polymer there are bands of 828 cm.sup.-1 and 1,237 cm.sup.-1 corresponding to valence vibrations of the group Si(CH.sub.3).sub.2 ; bands 2,944; 2,895; 2,877 and 2,780 cm.sup.-1 corresponding to valence vibrations of the group .dbd.C--H in methyl and methylene groups; bands 1,050 and 1,126 cm.sup.-1 characteristic for the grouping .dbd.SiCH.sub.2 CH.sub.2 Si.dbd. and also bands 1,400, 765, 720, 690, 610 and 300 cm.sup.-1.
In the combination scattering spectrum there is observed the band of 385 cm.sup.-1 corresponding to valence vibrations of the bond .tbd.Si--Si.tbd..
NMR spectra of a benzene solution of the polymer contain signals: .delta..sup.1 H.sub.(CH.sbsb.3.sub.-Si) .dbd.0.275 ppm (12H, s) .delta..sup.1 H.sub.CH.sbsb.2 .dbd.0.875 ppm (4H, s); .delta..sup.13 C.sub.(CH.sbsb.3.sub.-Si) .dbd.--0.4 ppm (4C), .delta..sup.13 C.sub.(CH.sbsb.2.sub.) .dbd.13.84 ppm (2C).
The ratio of intensities of the signals of protons (carbons) of methyl and methylene groups correspond to the above-given structure of a monomer unit.
The polymer crystallinity is justified by the presence of clearly pronounced reflexes in the X-ray pattern, as well as by the presence of an endothermal peak in the differential-thermal analysis curve which peak corresponds to the melting point of 113.degree. C. The polymer molecular weight of (1.1-1.4). 10.sup.5 (n=800 to 1,000) has been found through intrinsic viscosity in a solution of benzene at the temperature of 60.degree. C. (n=0.20 to 0.27 dl/g) in a manner similar to that employed for other organosilicon polymers.
In accordance with the
REFERENCES:
patent: 2381002 (1945-08-01), Patnode
patent: 3422039 (1969-01-01), Sergeevich et al.
Guselnikov Leonid E.
Nametkin Nikolai S.
Polyakov Jury P.
Volnina Elvira A.
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