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Influence of moisture in polyurethane shape memory polymers and their electrically conductive composites.

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Influence of moisture in polyurethane shape memory polymers and their electrically conductive composites.
นักวิจัย : Yang, Bin.
คำค้น : DRNTU::Engineering::Materials::Organic/Polymer electronics.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2550
อ้างอิง : Yang, B. (2007). Influence of moisture in polyurethane shape memory polymers and their electrically conductive composites. Doctoral thesis, Nanyang Technological University, Singapore. , http://hdl.handle.net/10356/36045
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : -
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

This dissertation presents a systematic study on the influence of moisture in polyurethane shape memory polymers (SMPs) and their electrically conductive composites. It was found that Tg of the SMP decreases by about 40 °C after immersion in water. This phenomenon is caused by the weakening of the hydrogen bonding between N-H and C=0 groups due to the absorbed water. Furthermore, the water absorbed into the SMP can be separated into two parts, free water and bound water. Each part was quantified in the course of this study. The bound water in the SMP significantly reduces T in an almost linear manner, while the effect of free water is negligible. Based on these findings three new features of the polyurethane SMPs were proposed: SMPs with functionally gradient Tg , water actuated shape recovery, and porous SMPs using water as a non-toxic foaming agent.

157 p.

บรรณานุกรม :
Yang, Bin. . (2550). Influence of moisture in polyurethane shape memory polymers and their electrically conductive composites..
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Yang, Bin. . 2550. "Influence of moisture in polyurethane shape memory polymers and their electrically conductive composites.".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Yang, Bin. . "Influence of moisture in polyurethane shape memory polymers and their electrically conductive composites.."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2550. Print.
Yang, Bin. . Influence of moisture in polyurethane shape memory polymers and their electrically conductive composites.. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2550.