Elastomer reinforcement from a glassy polymer polymerized in situ

Fu, Fengyan; Mark, J. E.

doi:10.1002/polb.1988.090261103

Cited by 15 publications

(11 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hybrid polymer elastomers containing PDMS have been studied extensively in the literature, but their fracture properties and microstructures are yet to be thoroughly investigated. − Early work by Sperling and Sarge reported the synthesis and investigation of thermally activated, radically polymerized full- and graft-IPNs of PDMS with polymethylmethacrylate (PMMA) and polystyrene (PS), measuring their shear moduli through torsional measurements at fixed ratios of PDMS to PMMA or PS. Further work by He et al tested full- and graft-IPNs of PDMS with PMMA using a one-pot thermally activated synthesis method, in which the materials were characterized for stress–strain behavior, surface energy, optical properties, and thermal behavior.…”

Section: Introductionmentioning

confidence: 99%

Tough, Transparent, Photocurable Hybrid Elastomers

Silvaroli

Heyl

Qiang

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

We investigated polydimethylsiloxane/poly(methyl methacrylate) (PDMS/PMMA) interpenetrating polymer networks (IPNs) by both sequential and simultaneous syntheses. In the sequential IPN, the PDMS network was first thermally cured after which methyl methacrylate was swelled in and UV photopolymerized in situ. The simultaneous IPN consists of a one-pot, single-step UV cure of both components. Pure shear fracture and tensile tests were used to extract the Young's modulus, critical fracture strain, and fracture energy of the materials at varying PMMA fractions (up to 50 wt %). At high PMMA fractions, a maximum increase in Young's modulus (42×) and fracture energy (21×) was observed with little sacrifice in the optical properties and the extensibility of notched samples. The Krieger−Dougherty model for particle reinforcement was fit to the modulus data as a function of the PMMA fraction and showed good agreement. The optical properties and microstructure of the IPNs were investigated by UV−visible light transmission, smallangle X-ray scattering (SAXS), and atomic force microscopy (AFM). As the weight fraction of PMMA increased, the simultaneous IPN became less transparent, while the sequential material showed the opposite trend. In the sequential IPN, the minority phase size decreased with increasing PMMA fraction, while it was constant for the simultaneous IPN. Therefore, it was concluded that the sequential IPN transparency is controlled by the size of the PMMA domains, but the simultaneous IPN transparency is controlled by the PMMA fraction. SAXS and AFM also showed evidence of bicontinuous network formation in the simultaneous IPN, which may affect the optical and mechanical properties.

show abstract

Section: Introductionmentioning

confidence: 99%

Tough, Transparent, Photocurable Hybrid Elastomers

Silvaroli

Heyl

Qiang

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Glassy and semicrystalline polymers can potentially provide sufficient mechanical reinforcement to polysiloxanes. Several groups have prepared PDMS/glassy thermoplastic blends via in situ radical copolymerization of a monomer in the presence of a PDMS matrix, improving the mechanical properties of PDMS by incorporating polystyrene (PS) − and other glassy polymers. , Although the in situ polymerization strategy can yield relatively small fillers, the immiscibility and large viscosity difference make it almost impossible to obtain uniform filler dispersion. In addition, the immiscibility between PDMS and PS heavily destabilizes the morphology and precludes strong interfacial adhesion, − limiting the improvement of mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Easy-Processable and Aging-Free All-Polymer Polysiloxane Composites

Shen

Wang

Goyal

et al. 2020

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

Here, we report all-polymer polysiloxane composites that overcome the long-standing processing problems of silica-reinforced silicone rubbers. Polystyrene fillers are dispersed with styrene/dimethylsiloxane symmetric diblock and triblock copolymers that control the filler morphology, filler−matrix interactions, and filler−filler interactions. Surprisingly, the composites not only rival the traditional silica-reinforced polysiloxane in mechanical properties of cured materials but also have better processability and stability than the silica-filled compound before curing. Large amplitude oscillatory shear experiments demonstrate that the triblock copolymer addition strongly affects the rheological properties. We hypothesize that the bridges and entangled loops that were formed by the triblock copolymer can connect different PS domains to provide additional reinforcement. The aging effect that originates from PDMS chain adsorption on the filler particle surface is also avoided because of the thermodynamic repulsion between PS and PDMS phases.

show abstract

“…Therefore, the PDMS membrane is often reinforced by using an inorganic filler like silica and introducing a rigid polymer. 23 T o remove the disadvantages of the PDMS membrane, a variety of graft and block copolymers containing dimethylsiloxane were also synthesized as membrane materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation of polydimethylsiloxane/polystyrene interpenetrating polymer network membranes and permeation of aqueous ethanol solutions through the membranes by pervaporation

Miyata

Higuchi

Okuno

et al. 1996

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

INTRODUCTIONMany studies on developments of polymer membranes have been undertaken for the separation and concentration of aqueous ethanol solutions by pervaporation.' In pervaporation, the permeability and selectivity of membranes depend on both the solubility and diffusivity of the permeants in them. The solubility of the permeants into the membranes is governed mainly by the affinity of the membranes for the permeants, which results from their chemical structures. The diffusivity of the permeants in the membranes is influenced mainly by the physical structures of the membranes. Therefore, the physical and chemical structures must be precisely designed for the development of high-performance membranes.As ethanol-permselective membranes for the concentration of aqueous ethanol solutions, the polydimethylsiloxane (PDMS) membrane, the ~ * To whom correspondence should be addressed.Journal of Applied Polymer Science, Vol 61, 1315Vol 61, -1324Vol 61, (1996 0 1996 John Wiley & Sons, Inc.CCC 002 1 -8995/96/0813 poly[ 1-(trimethylsily1)-1-propyne] (PTMSP) membrane, and their derivatives are well The ethanol permselectivities of their membranes are attributed to their stronger affinity for ethanol and to the relatively high diffusivity of the ethanol in the membranes. Therefore, the ethanol permselectivity of the membranes can be enhanced by improving their affinity for ethanol and the diffusivity of ethanol in the membranes on the basis of the design of their physical and chemical structures.There are some studies on the permeation and separation of aqueous ethanol solutions through the PDMS membrane by pervaporation. The PDMS membrane is ethanol permselective, since it has a stronger affinity for ethanol than for water. The high diffusivity of ethanol in the PDMS membrane, which results from free rotation of Si-0 bonds, also causes excellent ethanol permselectivity. Although the PDMS membrane has many advantages such as low surface free energy, high gas permeability, and good biocompatibility,'8-22 its mechanical properties are rather poor. Therefore, the PDMS membrane is often reinforced by using an inorganic filler like silica and introducing a rigid polymer.23T o remove the disadvantages of the PDMS membrane, a variety of graft and block copolymers containing dimethylsiloxane were also synthesized as membrane materials.Polymer blending is a promising technique for the improvement of physical and chemical properties of material^.'^ However, blending of general polymers is difficult because there are few combinations of miscible polymers. Since phase separation generally takes place in the blending of immiscible polymers, improvement of physical and chemical properties of materials is rarely achieved.One of the methods to blend various polymers is the formation of an interpenetrating polymer network (IPN), which is defined as a combination of two polymers in network form.2"3* IPN attracts our attention, since improvement of the material properties is expected. Therefore, IPNs containing PDMS as a component were s...

show abstract

Elastomer reinforcement from a glassy polymer polymerized in situ

Cited by 15 publications

References 14 publications

Tough, Transparent, Photocurable Hybrid Elastomers

Tough, Transparent, Photocurable Hybrid Elastomers

Easy-Processable and Aging-Free All-Polymer Polysiloxane Composites

Preparation of polydimethylsiloxane/polystyrene interpenetrating polymer network membranes and permeation of aqueous ethanol solutions through the membranes by pervaporation

Contact Info

Product

Resources

About