The effect of moisture absorption on the physical properties of polyurethane shape memory polymer foams
The effect of moisture absorption on the glass transition temperature (T(g)) and stress/strain behavior of network polyurethane shape memory polymer (SMP) foams has been investigated. With our ultimate goal of engineering polyurethane SMP foams for use in blood contacting environments, we have inves...
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| Veröffentlicht in: | Smart materials and structures 2011-08, Vol.20 (8), p.085010-1-6 |
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| creator | Yu, Ya-Jen Hearon, Keith Wilson, Thomas S Maitland, Duncan J |
| description | The effect of moisture absorption on the glass transition temperature (T(g)) and stress/strain behavior of network polyurethane shape memory polymer (SMP) foams has been investigated. With our ultimate goal of engineering polyurethane SMP foams for use in blood contacting environments, we have investigated the effects of moisture exposure on the physical properties of polyurethane foams. To our best knowledge, this study is the first to investigate the effects of moisture absorption at varying humidity levels (non-immersion and immersion) on the physical properties of polyurethane SMP foams. The SMP foams were exposed to differing humidity levels for varying lengths of time, and they exhibited a maximum water uptake of 8.0% (by mass) after exposure to 100% relative humidity for 96 h. Differential scanning calorimetry results demonstrated that water absorption significantly decreased the T(g) of the foam, with a maximum water uptake shifting the T(g) from 67 °C to 5 °C. Samples that were immersed in water for 96 h and immediately subjected to tensile testing exhibited 100% increases in failure strains and 500% decreases in failure stresses; however, in all cases of time and humidity exposure, the plasticization effect was reversible upon placing moisture-saturated samples in 40% humidity environments for 24 h. |
| doi_str_mv | 10.1088/0964-1726/20/8/085010 |
| format | Article |
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With our ultimate goal of engineering polyurethane SMP foams for use in blood contacting environments, we have investigated the effects of moisture exposure on the physical properties of polyurethane foams. To our best knowledge, this study is the first to investigate the effects of moisture absorption at varying humidity levels (non-immersion and immersion) on the physical properties of polyurethane SMP foams. The SMP foams were exposed to differing humidity levels for varying lengths of time, and they exhibited a maximum water uptake of 8.0% (by mass) after exposure to 100% relative humidity for 96 h. Differential scanning calorimetry results demonstrated that water absorption significantly decreased the T(g) of the foam, with a maximum water uptake shifting the T(g) from 67 °C to 5 °C. Samples that were immersed in water for 96 h and immediately subjected to tensile testing exhibited 100% increases in failure strains and 500% decreases in failure stresses; however, in all cases of time and humidity exposure, the plasticization effect was reversible upon placing moisture-saturated samples in 40% humidity environments for 24 h.</description><identifier>ISSN: 0964-1726</identifier><identifier>EISSN: 1361-665X</identifier><identifier>DOI: 10.1088/0964-1726/20/8/085010</identifier><identifier>PMID: 21949469</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Applied sciences ; Biological and medical sciences ; Cellular ; Condensed matter: structure, mechanical and thermal properties ; Equations of state, phase equilibria, and phase transitions ; Exact sciences and technology ; Failure ; Forms of application and semi-finished materials ; Humidity ; Mechanical properties ; Medical sciences ; Moisture ; Organic polymers ; Physical properties ; Physicochemistry of polymers ; Physics ; Plastic foam ; Polymer industry, paints, wood ; Polyurethane foam ; Properties and characterization ; Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects) ; Shape memory ; Solid-solid transitions ; Specific phase transitions ; Strain ; Technology of polymers ; Technology. Biomaterials. Equipments. Material. 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With our ultimate goal of engineering polyurethane SMP foams for use in blood contacting environments, we have investigated the effects of moisture exposure on the physical properties of polyurethane foams. To our best knowledge, this study is the first to investigate the effects of moisture absorption at varying humidity levels (non-immersion and immersion) on the physical properties of polyurethane SMP foams. The SMP foams were exposed to differing humidity levels for varying lengths of time, and they exhibited a maximum water uptake of 8.0% (by mass) after exposure to 100% relative humidity for 96 h. Differential scanning calorimetry results demonstrated that water absorption significantly decreased the T(g) of the foam, with a maximum water uptake shifting the T(g) from 67 °C to 5 °C. Samples that were immersed in water for 96 h and immediately subjected to tensile testing exhibited 100% increases in failure strains and 500% decreases in failure stresses; however, in all cases of time and humidity exposure, the plasticization effect was reversible upon placing moisture-saturated samples in 40% humidity environments for 24 h.</description><subject>Applied sciences</subject><subject>Biological and medical sciences</subject><subject>Cellular</subject><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Equations of state, phase equilibria, and phase transitions</subject><subject>Exact sciences and technology</subject><subject>Failure</subject><subject>Forms of application and semi-finished materials</subject><subject>Humidity</subject><subject>Mechanical properties</subject><subject>Medical sciences</subject><subject>Moisture</subject><subject>Organic polymers</subject><subject>Physical properties</subject><subject>Physicochemistry of polymers</subject><subject>Physics</subject><subject>Plastic foam</subject><subject>Polymer industry, paints, wood</subject><subject>Polyurethane foam</subject><subject>Properties and characterization</subject><subject>Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)</subject><subject>Shape memory</subject><subject>Solid-solid transitions</subject><subject>Specific phase transitions</subject><subject>Strain</subject><subject>Technology of polymers</subject><subject>Technology. Biomaterials. Equipments. Material. 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Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)</topic><topic>Shape memory</topic><topic>Solid-solid transitions</topic><topic>Specific phase transitions</topic><topic>Strain</topic><topic>Technology of polymers</topic><topic>Technology. Biomaterials. Equipments. Material. Instrumentation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yu, Ya-Jen</creatorcontrib><creatorcontrib>Hearon, Keith</creatorcontrib><creatorcontrib>Wilson, Thomas S</creatorcontrib><creatorcontrib>Maitland, Duncan J</creatorcontrib><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Smart materials and structures</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yu, Ya-Jen</au><au>Hearon, Keith</au><au>Wilson, Thomas S</au><au>Maitland, Duncan J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The effect of moisture absorption on the physical properties of polyurethane shape memory polymer foams</atitle><jtitle>Smart materials and structures</jtitle><addtitle>Smart Mater Struct</addtitle><date>2011-08-01</date><risdate>2011</risdate><volume>20</volume><issue>8</issue><spage>085010</spage><epage>1-6</epage><pages>085010-1-6</pages><issn>0964-1726</issn><eissn>1361-665X</eissn><abstract>The effect of moisture absorption on the glass transition temperature (T(g)) and stress/strain behavior of network polyurethane shape memory polymer (SMP) foams has been investigated. With our ultimate goal of engineering polyurethane SMP foams for use in blood contacting environments, we have investigated the effects of moisture exposure on the physical properties of polyurethane foams. To our best knowledge, this study is the first to investigate the effects of moisture absorption at varying humidity levels (non-immersion and immersion) on the physical properties of polyurethane SMP foams. The SMP foams were exposed to differing humidity levels for varying lengths of time, and they exhibited a maximum water uptake of 8.0% (by mass) after exposure to 100% relative humidity for 96 h. Differential scanning calorimetry results demonstrated that water absorption significantly decreased the T(g) of the foam, with a maximum water uptake shifting the T(g) from 67 °C to 5 °C. Samples that were immersed in water for 96 h and immediately subjected to tensile testing exhibited 100% increases in failure strains and 500% decreases in failure stresses; however, in all cases of time and humidity exposure, the plasticization effect was reversible upon placing moisture-saturated samples in 40% humidity environments for 24 h.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><pmid>21949469</pmid><doi>10.1088/0964-1726/20/8/085010</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Applied sciences Biological and medical sciences Cellular Condensed matter: structure, mechanical and thermal properties Equations of state, phase equilibria, and phase transitions Exact sciences and technology Failure Forms of application and semi-finished materials Humidity Mechanical properties Medical sciences Moisture Organic polymers Physical properties Physicochemistry of polymers Physics Plastic foam Polymer industry, paints, wood Polyurethane foam Properties and characterization Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects) Shape memory Solid-solid transitions Specific phase transitions Strain Technology of polymers Technology. Biomaterials. Equipments. Material. Instrumentation |
| title | The effect of moisture absorption on the physical properties of polyurethane shape memory polymer foams |
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