The effect of the glass transition temperature on the toughness of photopolymerizable (meth)acrylate networks under physiological conditions

Smith, Kathryn E.; Parks, Suzanne S.; Hyjek, Michelle A.; Downey, Sara E.; Gall, Ken

doi:10.1016/j.polymer.2009.08.040

Cited by 60 publications

(52 citation statements)

References 45 publications

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“…The T g of the materials is important to be determined since it is directly related with their mechanical properties and with their service temperature. Typically, the toughness of a material attains its maximum at a temperature slightly below or at the polymer's T g , temperature at which the polymer chains increase their molecular motion, allowing the material to sustain larger strains without compromising the strength [42]. The DMTA traces of the UPRs, at 1 Hz, are presented in Figure 6.…”

Section: Development and Characterization Of Biouprsmentioning

confidence: 99%

Going greener: Synthesis of fully biobased unsaturated polyesters for styrene crosslinked resins with enhanced thermomechanical properties

Costa¹,

Fonseca²,

Moniz³

et al. 2017

Express Polym. Lett.

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Abstract. The main goal of this work was the development of fully biobased unsaturated polyesters (UPs) that upon crosslinking with unsaturated monomers (UM) could lead to greener unsaturated polyester resins (UPRs) with similar thermomechanical properties to commercial fossil based UPR. After the successful synthesis of the biobased UPs, those were crosslinked with styrene (Sty), the most commonly used monomer, and the influence of the chemical structure of the UPs on the thermomechanical characteristics of UPRs were evaluated. The properties were compared with those of a commercial resin (Resipur 9837 ® ). The BioUPRs presented high gel contents and contact angles that are similar to the commercial resin. The thermomechanical properties were evaluated by dynamic mechanical thermal analysis (DMTA) and it was found that the UPR synthesized using propylene glycol (PG), succinic acid (SuAc) and itaconic acid (ItAc) presented very close thermomechanical properties compared to the commercial resin.

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Section: Development and Characterization Of Biouprsmentioning

confidence: 99%

Going greener: Synthesis of fully biobased unsaturated polyesters for styrene crosslinked resins with enhanced thermomechanical properties

Costa¹,

Fonseca²,

Moniz³

et al. 2017

Express Polym. Lett.

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show abstract

“…811 cm −1 ) following photopolymerisation, together with the DSC data, confirmed that the reaction was complete (Warren et al, 2010). As the cross link density increases a polymer becomes increasingly less able to swell and the level of equilibrium swelling, q, decreases Smith et al, 2009a;Warren et al, 2010). Linear tBA, t100/P0, completely dissolved in propan-2-ol in a matter of hours indicating a complete absence of covalent cross-links.…”

Section: Initial Observationsmentioning

confidence: 67%

The effect of organoclay addition on the properties of an acrylate based, thermally activated shape memory polymer

Barwood

Breen

Clegg

et al. 2014

Applied Clay Science

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Shape Memory Polymers (SMPs) exhibit the intriguing ability to change back from an intermediate, deformed shape back to their original, permanent shape. In this contribution a systematic series of t-butylacrylate-copoly(ethyleneglycol) dimethacrylate (tBA-co-PEGDMA) polymers have been synthesised and characterised prior to incorporation of organoclay. Increasing the poly(ethyleneglycol) dimethacrylate (PEGDMA) content in increments of 10% increased the storage modulus from 2005 to 2250 MPa, reduced the glass transition temperature from +41 to − 26°C and reduced the intensity of the associated tan δ peak. The tBA-co-PEGDMA crosslinked networks displayed useful shape memory properties up to PEGDMA contents of 40%. Above this PEGDMA percentage the materials were prone to fracture and too brittle for a realistic assessment of their shape memory capability. The system containing 90% t-butylacrylate (tBA) and 10% PEGDMA was selected as the host matrix to investigate how the incorporation of 1 to 5 mass% of a benzyl tallow dimethylammoniumexchanged bentonite (BTDB) influenced the shape memory properties. X-ray diffraction data confirmed that BTDB formed a microcomposite in the selected matrix and exerted no influence on the storage modulus, rubbery modulus, glass transition temperature, T g , or the shape or intensity of the tan δ peak of the host matrix. Therefore, it was anticipated that the presence of BTDB would have no effect, positive or negative, nor on the shape memory properties of the host matrix. However, it was found that the incorporation of clay, especially at the 1 mass% level, significantly accelerated the speed, compared with the clay-free SMP, at which the microcomposite returned to the original, permanent shape. This accelerated return to the permanent shape was also observed when the microcomposite was coated onto a 100 μm PET film.

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“…A number of studies have detailed the influence of the glass transition temperature (Tg) on the mechanical properties of (meth)acrylate networks [18–22], especially under physiologically simulated conditions. The mechanical behavior of amorphous polymer networks is highly temperature dependent, where a polymer can exhibit glassy or rubbery behavior if cooled below or heated above its Tg, respectively.…”

Section: Introductionmentioning

confidence: 99%

Semi-degradable poly(β-amino ester) networks with temporally controlled enhancement of mechanical properties

et al. 2014

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Biodegradable polymers are clinically used in numerous biomedical applications, and classically show a loss in mechanical properties within weeks of implantation. This work demonstrates a new class of semi-degradable polymers that show an increase in mechanical properties through degradation via a controlled shift in a thermal transition. Semi-degradable polymer networks, poly(β-amino ester)-co-methyl methacrylate, were formed from a low glass transition temperature crosslinker, poly(β-amino ester), and high glass transition temperature monomer, methyl methacrylate, which degraded in a manner dependent upon the crosslinker chemical structure. In vitro and in vivo degradation revealed changes in mechanical behavior due to the degradation of the crosslinker from the polymer network. This novel polymer system demonstrates a strategy to temporally control the mechanical behavior of polymers and to enhance the initial performance of smart biomedical devices.

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The effect of the glass transition temperature on the toughness of photopolymerizable (meth)acrylate networks under physiological conditions

Cited by 60 publications

References 45 publications

Going greener: Synthesis of fully biobased unsaturated polyesters for styrene crosslinked resins with enhanced thermomechanical properties

Going greener: Synthesis of fully biobased unsaturated polyesters for styrene crosslinked resins with enhanced thermomechanical properties

The effect of organoclay addition on the properties of an acrylate based, thermally activated shape memory polymer

Semi-degradable poly(β-amino ester) networks with temporally controlled enhancement of mechanical properties

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