Radical concentrations in free radical copolymerization of MMA/EGDMA

Zhu, Shiping; Tian, Yuan; Hamielec, A. E.; Eaton, D. R.

doi:10.1016/0032-3861(90)90368-9

Cited by 136 publications

(109 citation statements)

References 20 publications

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“…Subsequently, the radical concentration exhibits a small drop, followed by a gradual increase. 12 This is consistent with our data as shown in Figure 1.…”

Section: Introductionsupporting

confidence: 95%

Studies of crosslinked poly(AM-MSAS-AA) gels. II. Effects of polymerization conditions on the water absorbency

Zhou

Yao

Kurth

1997

J. Appl. Polym. Sci.

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Hydrogels with varying crosslinking ratio and ionic content were prepared by copolymerization of acrylamide (AM), sodium methallylsulfonate (MSAS), sodium acrylate (AA), and N,N-methylenebisacrylamide (BisA) in aqueous solution using potassium persulfate (KPS)/N,N,N,N-tetramethylethylenediamine (TMEDA) as initiator. The influences of synthetic variables (reaction time, crosslinker concentration, monomer concentration, initiator concentration, temperature, and pH) on the polymerization conversion ( y %) and water absorbency ( Q) were studied in detail. These gels, which absorbed about 125 times their own weight in distilled water, have potential application as water superabsorbents.

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“…Subsequently, the radical concentration exhibits a small drop, followed by a gradual increase. 12 This is consistent with our data as shown in Figure 1.…”

Section: Introductionsupporting

confidence: 95%

Studies of crosslinked poly(AM-MSAS-AA) gels. II. Effects of polymerization conditions on the water absorbency

Zhou

Yao

Kurth

1997

J. Appl. Polym. Sci.

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“…(13) and (15) that the of pseudo-steady-state is not valid any longer in larger A is, the lower the concentration of the gel the MMA crosslinking copolymerization. 25 Howradicals is. Let k* pgs Å b 1 k* pss , k* psg Å b 2 k* pss , and it ever, for VC polymerization, if the crosslinking is clear that b 1 and b 2 are not bigger than unity.…”

Section: Effects Of Diffusion On the Termination Reactionmentioning

confidence: 99%

A model of the gel fraction of polymer in the vinyl chloride/divinyl monomers suspension copolymerization

Luo

Wang

Huang

et al. 1997

J. Appl. Polym. Sci.

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Based on our previous general model of the gel/sol partition, a model of the gel fraction of polymer is developed in the VC heterogeneously crosslinking suspension polymerization, where the kinetic factors such as two-phase polymerization mechanism, distinction of the gel and sol radicals, and the effects of the gel on kinetics are taken into account. The model is applied to the VC/diallyl phthalate (DAP) suspension copolymerization. The model parameters are obtained by fitting the experimental data with the model. The model turns out to be successful to predict the development of the gel fraction with conversion. It is inferred that the intermolecular crosslinking reaction is affected by diffusion. In addition, the crosslinks prove to be nonrandomly distributed in the VC/DAP suspension copolymerization.

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“…Since the 1970s several scientists have investigated the polymer behaviors of crosslinked PMMA [14,[22][23][24][25][26]. Cross-linked PMMA is used in a variety of commercial materials such as membranes [27], dental fillings [28], dentures, latex coatings [29], computer-to-sensor data transmission links [30], composites [31], optically clear sheeting, limb prostheses, bathtubs, bathroom sinks and shower surrounds where cross-linking plays a vital role in both processing and ultimate properties.…”

Section: Methyl Methacrylate (Mma)mentioning

confidence: 99%

“…Polymer chains are viscoelastic in nature and cross-linking will increase the rigidity of chains which will retard the segmental motion of chains. Modification of the monomer that leads to a cross-linkable monomer has been receiving great attention in recent years due to their potential for the development of products such as thermosetting moulding compounds, coatings, superabsorbent and ion exchange resins [22]. A number of cross-linkers are used for the synthesis of such products.…”

Section: Cross-linkersmentioning

confidence: 99%

Co-polymerization of Acrylates

Srivastava

2009

Designed Monomers and Polymers

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Co-polymers of methyl methacrylates (MMAs) are widely used in coatings because of their film-forming capacity, which is due to better bond-forming tendency with various substrates. The adhesion of coating with various substrates such as wood, metal or plastics is an important property for protective, as well as decorative coatings. Co-polymers of MMA with different monomers such as butyl acrylate (BuA), 2-ethyl hexyl acrylate (2-EHA) and hydroxyl ethyl methacrylate (HEMA) are extensively used for coatings on different substrates to improve the roughness, acid scratch and solvent resistances. Co-polymerization of diacrylates/dimethacrylates of glycols with various alkyl esters have been investigated by several scientists. In the synthesis of these materials an understanding of polymerization mechanism and kinetics is important for better control of gel structure. The rate constant depends largely on the physical properties of the system, which in turn, are strong functions of monomer conversion. Cross-link density is one of them, and T g also depends on it, increasing with increasing cross-link density.

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Radical concentrations in free radical copolymerization of MMA/EGDMA

Cited by 136 publications

References 20 publications

Studies of crosslinked poly(AM-MSAS-AA) gels. II. Effects of polymerization conditions on the water absorbency

Studies of crosslinked poly(AM-MSAS-AA) gels. II. Effects of polymerization conditions on the water absorbency

A model of the gel fraction of polymer in the vinyl chloride/divinyl monomers suspension copolymerization

Co-polymerization of Acrylates

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