Rigid foam insulation gets a climate chemistry upgrade

Abstract Rotator cuff (RC) tears cause pain and functional disability of the shoulder. Despite advances in suture anchors, there are still reports about the incidence of surgical-related injuries to RC mainly associated with sutures. The purpose of this study was to design and evaluate the mechanical behavior of sutureless implants to repair RC tears. We hypothesized that the implants present mechanical characteristics suitable for the surgical treatment of RC tears as suture anchors. Three different implants (T1,T2,T3) were designed and fabricated with titanium: T1 has two rods and rectangular head; T2 has two rods with a small opening and enlarged rectangular head and T3 has three rods and a circular head. The implants were fixed in rigid polyurethane foam blocks by a series of blows, and the applied mechanical loads along with the number of blows were quantified. Pullout tests using tapes fixed between the implant head and testing machine grip were conducted until implant failure. The maximum pullout strength and displacement of the implant relative to the rigid foam block were computed. Statistical significance was set at p < 0.05. Owing to its geometric configuration, implant T2 presented the best characteristics related to stability, strength, and ease of insertion. Implant T2 confirms our hypothesis that its mechanical behavior is compatible with that of suture anchors which could lead to the reduction of RC repair failures and simplify the arthroscopic procedure.

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Extender Polyol Advances in Rigid Foam

Journal of Cellular Plastics ◽

10.1177/0021955x8402000605 ◽

1984 ◽

Vol 20 (6) ◽

pp. 430-432

Author(s):

F. Guenther

Keyword(s):

Rigid Foam

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The Study of Melamine Modified by Imidazolium Based Ionic Liquid [BMIM]PF6 on the Flame Retardancy of Rigid Polyurethane Foam

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1030-1032.241 ◽

2014 ◽

Vol 1030-1032 ◽

pp. 241-245 ◽

Cited By ~ 1

Author(s):

Yan Wei Li

Keyword(s):

Ionic Liquid ◽

Flame Retardant ◽

Polyurethane Foam ◽

Fire Retardant ◽

Rigid Polyurethane Foam ◽

Flame Resistance ◽

Initial Decomposition Temperature ◽

Noticeable Effect ◽

Rigid Foam ◽

Flame Retardant Properties

In this paper, the effect of C3H6N6modified by imidazolium based Ionic Liquid 1-butyl-methylimidazolium hexafluorophosphate ([BMIM]PF6) on polyurethane rigid foam flame retardant properties was conducted.The results show that the flame retardant properties of C3H6N6 modified with Ionic Liquid significantly increased and the LOI increased form 22.3 to 24.5. In the modification process, the ionic liquid mass have a very noticeable effect to the flame retardant property and when [BMIM]PF6 and C3H6N6 in quality was 4:6, Fire-retardant effect was best.Compared with the prior to the modification, C3H6N6 modified can increase effective Flame resistance of materials, horizontal burning speed from 67.6mm/min down to 33.4mm/min.Thermal degradation data show that C3H6N6 modified could improve initial decomposition temperature and reminder yield of rigid polyurethane foam,and then heat release reduced, the decomposition controlled,thermal stability increased.

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