Microemulsion and macroemulsion polymerization of octamethylcyclotetrasiloxane: A comparative study

Khanjani, Jaber; Zohuriaan‐Mehr, M. J.; Pazokifard, Shahla

doi:10.1080/10426507.2017.1315418

Cited by 4 publications

(5 citation statements)

References 38 publications

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“…Blending acrylic dispersions requires a test of compatibility, adjustment of pH, and, after the addition of solvent, plasticizers, or fillers, storage time. Peel improvement after longer storage times for a tackified acrylic dispersion is also necessary [1,6,7,15,51,52].…”

Section: Manufacturing Of Psasmentioning

confidence: 99%

Pressure-Sensitive Adhesive Joints

Khanjani¹

2019

Adhesives and Adhesive Joints in Industry Applications

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Self-adhesive materials are called, in the adhesive industry, pressure-sensitive adhesives (PSAs). PSAs are designed in the shapes of latex, solvent borne resin, rubber solution, or hot melt and are being used for foils and films, tapes, labels, and notepads which can make permanent, removable, or semi-removable adhesive joints for applications of general purpose product assembly by simple contact under light pressure. This special class of adhesives does not undergo any physical transformation or chemical reaction during the bonding process. The end-use properties of PSAs result from the nonlinear viscoelastic behavior of the adhesive material, and the elastomeric polymer basis of PSAs imparts them such a viscoelastic behavior caused by a carefully chosen polymer architecture and monomer composition with the proper addition of small molecules called tackifying resins. They are safe to use and easy to handle and thus are increasingly replacing more conventional types of adhesives. In this chapter, we review adhesion mechanism of PSAs, types of PSAs, adhesion properties and tests, mechanical behavior of joints, and especially different aspects of PSA applications.

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Section: Manufacturing Of Psasmentioning

confidence: 99%

Pressure-Sensitive Adhesive Joints

Khanjani¹

2019

Adhesives and Adhesive Joints in Industry Applications

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Section: Figure 28mentioning

confidence: 99%

Adhesives and Adhesive Joints in Industry Applications

2019

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She is the author or coauthor of 230 scientific publications and several patents in the field of adhesives. She is a member of a number of international and national organizations, and a reviewer and member of editorial boards of international journals. Her research activities are focused on the issues of analysis of the influence of technological and structural factors on polymer and metal adhesive joint strength, design of bonding technology, adhesive properties research, as well as issues related to receiving the appropriate adhesive properties to increase adhesive joint strength. ContentsPreface XIII Section 1 Adhesive and Adhesive Joints PropertiesChapter 1

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“…The increase in monomer conversion with an increase in DBSA concentration in the reaction mixture was later confirmed and the effect of other parameters on that conversion was investigated [ 13 ]. It was proved that the monomer conversion may be distinctly influenced by the use of other surfactants along with DBSA, as well as by the concentration and rate of addition of D4 and by the stirring rate.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of various factors on the polymer molecular weight (MW) and particle size in the emulsion polymerization of D4 in the presence of DBSA was also investigated [ 6 , 8 , 9 , 13 , 14 , 15 , 16 ]. It was reported that MW increased when the reaction temperature decreased [ 6 , 10 ], and that there was an optimal concentration of DBSA in the reaction mixture (2%) that resulted in the highest MW of the polymer [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…It was also shown that the particle size of the polymer increased when the size of monomer droplets increased [ 11 ], and it was proved that the latter depended on the DBSA concentration [ 14 , 15 ]. The other factors that were found to influence the particle size were the use of co-surfactants [ 13 ] and the way D4 was introduced into the reaction mixture [ 14 , 16 ]. The effect of various factors on D4 conversion, MW of the polymer and dispersion average particle size observed in the studies conducted on the cationic emulsion polymerization of D4 in the presence of DBSA is summarised in Supplementary Table S1 in the Supplementary Materials .…”

Section: Introductionmentioning

confidence: 99%

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Cationic Emulsion Polymerization of Octamethylcyclotetrasiloxane (D4) in Mixtures with Alkoxysilanes

et al. 2022

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The cationic emulsion polymerization of octamethylcyclotetrasiloxane (D4) in mixtures with methyltriethoxysilane (MTES) and vinyltriethoxysilane (VTES) was studied by FTIR ATR, GC, the development of a toluene insoluble fraction of the polymer and a gravimetric analysis. The polymerization of D4 alone was also conducted for comparison and, additionally, the development of molecular weight of polydimethylsiloxane (PDMS) obtained in that process was studied by GPC. Dodecylbenzenesulphonic acid (DBSA) was used as a surfactant and catalyst. The process was carried out in a “starved feed” mode by adding dropwise the monomer mixture to the aqueous solution of DBSA. FTIR ATR spectra were recorded by the sensor placed in the probe tip of a ReactIR 15TM apparatus. It was found that the silicone polymer formation proceeded faster when D4 was polymerized in the mixture with alkoxysilanes, especially in the beginning of the process, and that already at the beginning of the process, the partly crosslinked polymer was formed. The induction period of ca. 30 min was observed and the concentration of cyclic siloxanes (D4 and decamethylcyclopentasiloxane—D5) remained at a very low level in the course of the reaction and only traces were detected in the final product. The particle size development in the course of the reaction was also studied and it was found that the particle size distribution was bimodal and was broadening as the reaction proceeded, though this phenomenon was less distinct when D4 was polymerized in the mixtures with alkoxysilanes. The structure of the reaction product was confirmed by 29Si NMR.

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Microemulsion and macroemulsion polymerization of octamethylcyclotetrasiloxane: A comparative study

Cited by 4 publications

References 38 publications

Pressure-Sensitive Adhesive Joints

Pressure-Sensitive Adhesive Joints

Adhesives and Adhesive Joints in Industry Applications

Cationic Emulsion Polymerization of Octamethylcyclotetrasiloxane (D4) in Mixtures with Alkoxysilanes

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