Dynamic mechanical analysis of two crosslinked copolymer systems

Tamareselvy, Krishnan

doi:10.1016/0109-5641(94)90036-1

Cited by 42 publications

(32 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…44 One important factor affecting the thermomechanical properties of maxillofacial silicones is the percentage of cross-linking and crystallinity as it has been proven by DMA. 38,45 The decrement of Tg values could be associated with decreased density of cross-links after disinfection procedures or chain scissions due to continuous polymerization of elastomer or absorption phenomena. Goiato et al 11,24 have reported possible increment in cross-linking density after disinfecting silicone maxillofacial elastomers using neutral soap and effervescent denture cleanser tablets.…”

Section: Discussionmentioning

confidence: 99%

Dynamic Mechanical Thermal Analysis of Maxillofacial Prosthetic Elastomers

Eleni

Krokida

Polyzois

et al. 2014

Journal of Craniofacial Surgery

View full text Add to dashboard Cite

In this study, dynamic mechanical thermal analysis was used to evaluate the changes that occurred in maxillofacial elastomers subjected to different disinfecting regimens. A commercial polydimethyl siloxane (PDMS) and an experimental chlorinated polyethylene (CPE) were treated with different disinfection procedures for a period that simulates 1 year of clinical service: microwave exposure (D1), hypochlorite solution (D2), neutral soap (D3), and a commercial disinfecting solution (D4). A fifth group was kept in dark storage as control. Dynamic mechanical thermal analysis tests operated in a fixed frequency (1 Hz) over a range of temperatures (-130°C to 20°C for PDMS, -60°C to 120°C for CPE). Loss modulus (G″), storage modulus (G'), and loss factor (tanδ) were recorded as a function of temperature. The obtained glass transition temperature (Tg) values were subjected to statistical analysis. Dynamic mechanical thermal analysis revealed changes in Tg values for both materials, which reflect the possible changes in their chemical and physical structure, after different disinfection procedures. The PDMS and CPE samples seem to have less dense structure maybe because of chain scission reaction that probably occurred during the disinfection procedures. According to statistical analysis, Tg values presented significant changes from the control samples among the different materials and disinfecting procedures. Microwave exposure and hypochlorite solution affect CPE significantly, whereas PDMS exhibited significant changes after being treated with a commercial antimicrobial agent, concerning changes that occurred in Tg. In all cases, Tg values were decreased compared with the untreated samples, which were stiffer, presenting higher Tg and G' values.

show abstract

Section: Discussionmentioning

confidence: 99%

Dynamic Mechanical Thermal Analysis of Maxillofacial Prosthetic Elastomers

Eleni

Krokida

Polyzois

et al. 2014

Journal of Craniofacial Surgery

View full text Add to dashboard Cite

show abstract

“…The degree of polymer crosslinking was assessed by measurement of the glass transition temperature 27 and by the softening effect of ethanol (that is, the swelling test) 12 was performed. Since poly(methyl methacrylate) dissolves completely in ethanol, it was assumed that a more linear polymer would be softened to a higher degree than a more crosslinked polymer.…”

Section: Discussionmentioning

confidence: 99%

Influence of curing modes on crosslink density in polymer structures

Soh

Yap

2004

Journal of Dentistry

194

140

View full text Add to dashboard Cite

“…One important factor affecting the mechanical properties of maxillofacial silicones is the percentage of cross-linking, a fact that has been proven by dynamic mechanical analysis (DMA). 9 Environmental conditions can induce significant changes in the extension of cross-linking, strongly affecting the physical and mechanical properties of polymers. 10 Sunlight, temperature, moisture, wind, dust, and pollutants are the main climate factors negatively affecting the mechanical stability and causing degradation.…”

mentioning

confidence: 99%

Dynamic Mechanical Properties of a Maxillofacial Silicone Elastomer Incorporating a ZnO Additive

Mouzakis

Papadopoulos²,

Polyzois³

et al. 2010

Journal of Craniofacial Surgery

View full text Add to dashboard Cite

The main objective of the current study was to investigate the dynamic mechanical properties of a room-temperature vulcanizing silicone incorporating different fractions of zinc oxide (ZnO) after indoor and outdoor photoaging. Forty-eight samples were produced by adding different amounts of ZnO into a commercial maxillofacial silicone (EPISIL-E). The samples were divided into 4 groups containing 0.0, 0.2, 0.5, and 1 wt% ZnO additive, respectively. Samples were exposed to sunlight (subgroup 2), ultraviolet (subgroup 3), and fluorescence (subgroup 4) aging, whereas nonaged samples comprised the control subgroup (subgroup 1). Dynamic mechanical analysis was used to determine the storage modulus (E'), loss modulus (E″), and damping capacity (tanδ). General linear statistic model was conducted to evaluate the effects of aging, testing frequency, and composition on the dynamic mechanical properties of the silicone with the ZnO additive. Post hoc analysis was performed using Tukey test. Statistical analysis revealed a significant impact of composition on tanδ (P < 0.05). Aging influenced E' and E″ (P < 0.01). The combination of aging and composition had a significant effect on all dynamic properties (P < 0.01).

show abstract

Dynamic mechanical analysis of two crosslinked copolymer systems

Cited by 42 publications

References 15 publications

Dynamic Mechanical Thermal Analysis of Maxillofacial Prosthetic Elastomers

Dynamic Mechanical Thermal Analysis of Maxillofacial Prosthetic Elastomers

Influence of curing modes on crosslink density in polymer structures

Dynamic Mechanical Properties of a Maxillofacial Silicone Elastomer Incorporating a ZnO Additive

Contact Info

Product

Resources

About