Plasticizer loading in acoustic encapsulants - Springer
Plasticizer loading in acoustic encapsulants Impact on dynamic mechanical properties Matthew Rice Received: 19 July 2013/Accepted: 18 March 2014/Published online: 27 April 2014 Akademiai Kiado, Budapest, Hungary 2014 Abstract Acoustically transparent elastomers are the windows through which the United States Navy views the ocean.
Plasticizer loading in acoustic encapsulants | SpringerLink
The plasticizers used in this effort were sonar transducer fluid (castor oil, per MIL-T-17128C), Isopar-L isoparaffinic hydrocarbon from ExxonMobil, distilled water, and dioctyl phthalate (DOP) (≥99 %) and dioctyl terephthalate (DOTP) (≥98 %) both from Sigma-Aldrich. Preparation of polyurethane samples
Plasticizer loading in acoustic encapsulants - DeepDyve
Plasticizer loading in acoustic encapsulants Rice, Matthew Journal of Thermal Analysis and Calorimetry, Volume 117 (2) – Aug 1, 2014 Read Article Download PDF Share Full Text for Free (beta) 4 pages Article Details Recommended References Bookmark Add to Folder Cite Social Times Cited: Web of Science Journals /
Plasticizer loading in acoustic encapsulants - ResearchGate
Acoustically transparent elastomers are the windows through which the United States Navy views the ocean. For acoustic clarity and sensitivity, it is important that the elastomer operates well...
Plasticizer loading in acoustic encapsulants - [PDF Document]
Plasticizer loading in acoustic encapsulants Impact on dynamic mechanical properties Matthew Rice Received: 19 July 2013 / Accepted: 18 March 2014 Akade miai Kiado , Budapest, Hungary 2014 Abstract Acoustically transparent elastomers are the windows through which the United States Navy views the ocean.
- Are thermoplastic polyurethane encapsulants degraded in underwater acoustic sensors?
- Degradation of thermoplastic polyurethane (TPU) encapsulants used in an underwater acoustic sensor (UAS) was examined by aging in seawater, and the lifetime of TPU encapsulants was estimated using an empirical approach based on accelerated lifetime test (ALT).
- Can TPU encapsulants protect hydrophones from seawater leakage?
- TPU encapsulants can effectively protect hydrophones in UASs from seawater leakage. However, TPU encapsulants can be torn or broken apart due to the degradation of mechanical properties in seawater , , , , resulting in hydrophone failures.
- Does aging in seawater affect the mechanical degradation of TPU encapsulants?
- The effect of aging in seawater on the mechanical degradation of TPU encapsulants used in UAS was studied and ALT was performed to predict the lifetime of TPU encapsulants. A decrease in tensile strength of TPU encapsulants was observed after aging in seawater.
- How are TPU encapsulants made?
- According to the supplier, the TPU encapsulants were produced by using an ether polyurethane consist of poly (tetramethylene glycol) (PTMG, Mw=1000 g/mol), 4,4′-methylene diphenyl diisocyanate (MDI) and 1,4-butanediol as the soft segment, hard segment and chain extender, respectively.
- How are TPU encapsulants aged?
- The TPU encapsulants were placed in seawater and aged at temperatures of 85, 100 and 110 °C. TPU encapsulants underwent a hydrolysis reaction during aging in seawater, changing the chemical structure and molecular weight of TPU.
- How long do TPU encapsulants last in seawater?
- The B 50% lifetime for the failure criterion for 50% of the initial tensile strength is 27.31 yr, indicating that half of TPU encapsulants will fail in seawater 27.31 years later. Table 3. B 10%, B 50% and B 90% lifetimes of TPU encapsulants in seawater at 25 °C calculated from the CDF of the Arrhenius–Weibull model. 4. Conclusion
