Molecular mobility in polymers with long-chain side groups

Borisova, T.I.; Burshtein, L.L.; Shevelev, V.A.; Shibayev, V.P.; Platé, N.A.

doi:10.1016/0032-3950(71)90073-6

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…The process of the copolymerization of the monomer modified with MA involves similar first two sections; however, the reaction does not end in the third section and proceeds slowly until a constant value of conversion. DA influences significantly upon the kinetics of the emulsion copolymerization when compared to DMA [9]. The deceleration of the copolymerization in the presence of the long-chain monomers is observed.…”

Section: Resultsmentioning

confidence: 92%

Emulsion copolymers of methyl acrylate and decyl (meth)acrylate: synthesis and properties

2019

VKhKhT

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This paper reports a kinetic investigation into the emulsion (co)polymerization of decyl meth-and decyl acrylate with methyl acrylate for the first time. The obtained results are used to prepare copolymers based on the products of the emulsion (co)polymerization. It is determined that decyl methacrylate does not homopolymerize with the formation of emulsions regardless of the nature of an emulsifier, its solubility and initiator structure. Moreover, they reduce the rate of copolymerization with methyl acrylate. The deceleration of the copolymerization in the presence of long-chain monomers is related to the a low activity of decyl (meth)acrylate as compared with methyl acrylate. The colloid-chemical and physicochemical properties of the synthesized dispersions are investigated. The position of the maximum of the dependences of viscosity and surface tension on the polymer composition coincides with the smallest particle sizes of the dispersion; hence, the alterations in the viscosity and surface tension of the dispersion are associated with the variations in particle sizes, which results in the changes in the interface surface area. The molecular weight distribution of emulsion copolymers is studied by a turbidimetric titration technique. The absorption of water, the strength and specific elongation of the (co)polymer films are determined by tension testing. Diffusion coefficients are calculated according to the first section of the water absorption curve; the obtained values show the deceleration of the rate of the water absorption by the copolymer film as compared with the polymethylacrylate films. The tensile strength of the poly(methyl acrylate-co-decyl acrylate) films is less than that of the poly(methyl acrylate-co-decyl methacrylate) ones, which corresponds with the well-known facts concerning the influence of a methyl substituent in an -position on the polymer properties. The addition of hydrophobic co-monomers, decyl meth-and decyl acrylate, to the structure of macromolecules with methyl acrylate strongly affects the properties of the dispersion and derived films, which is connected with the significant structural transformations of macromolecules in the dispersions and films.

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Section: Resultsmentioning

confidence: 92%

Emulsion copolymers of methyl acrylate and decyl (meth)acrylate: synthesis and properties

2019

VKhKhT

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“…With the lengthening of side‐chains of PMA‐ n , the α‐process is shifted to low temperatures due to the effect of self‐plasticization,5 while the β 1 ‐process position almost does not change 25, 26. As a result, the two processes approach each other on the temperature scale, and only one αβ 1 ‐process is observed.…”

Section: Resultsmentioning

confidence: 99%

“…Among a wide diversity of polymers, polymethacrylate derivatives are characterized as materials useful for practical applications. The first studies of molecular mobility in poly( n ‐alkyl methacrylate)s (PMA‐ n , where n is the number of carbon atoms in linear alkyl side‐chains) using the dielectric method were performed in the 1950s to 1970s 1–5…”

Section: Introductionmentioning

confidence: 99%