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Triple-shape properties of star-shaped POSS-polycaprolactone polyurethane networks

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Triple-shape properties of star-shaped POSS-polycaprolactone polyurethane networks
นักวิจัย : Bothe, Martin , Mya, Khine Yi , Jie Lin, Esther Marie , Yeo, Chee Chuan , Lu, Xuehong , He, Chaobin , Pretsch, Thorsten
คำค้น : -
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Bothe, M., Mya, K. Y., Jie Lin, E. M., Yeo, C. C., Lu, X., He, C., et al. (2012). Triple-shape properties of star-shaped POSS-polycaprolactone polyurethane networks. Soft Matter, 8(4), 965-972. , 1744-683X , http://hdl.handle.net/10220/10344 , http://dx.doi.org/10.1039/c1sm06474f
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Soft matter
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Here, we present an investigation of the triple-shape properties of star-shaped polyhedral oligomeric silsesquioxane-poly(ε-caprolactone) polyurethanes (SPOSS-PUs), which have three-dimensional network structures. In a typical ‘triple-shape functionalization process’, mostly consisting of two tensile deformations at different temperatures, chain immobilization of the polymer network component poly(ε-caprolactone) (PCL) was successfully realized first through crystallization and then through vitrification. Subsequently, large parts of the respective strains were released under stress-free recovery conditions. The two-fold fixed (‘programmed’) specimens responded to heating with two independent length contractions (switching steps); the first shape change was associated with PCL devitrification and the second one with the melting of hitherto crystalline PCL. It was revealed that the triple-shape properties of SPOSS-PU networks considerably depend on PCL network chain length. When applying exactly the same ‘triple-shape creation procedure’, larger strain releases were detected in the first transition for polymers with a higher PCL network chain length, whereas the second transition was more accentuated for SPOSS-PU networks with a shorter PCL chain length. In the course of thermo-mechanical cycling, the formation of a neck during the second tensile deformation was repeatedly detected for SPOSS-PUs with higher PCL network chain length; in the subsequent recovery process the specimens even exhibited the highest total strain recoverability. Finally, gradual strain release could be achieved at temperatures below the PCL melting transition through the selection of up to four temperature holding steps, at which every time stable shapes were formed.

บรรณานุกรม :
Bothe, Martin , Mya, Khine Yi , Jie Lin, Esther Marie , Yeo, Chee Chuan , Lu, Xuehong , He, Chaobin , Pretsch, Thorsten . (2555). Triple-shape properties of star-shaped POSS-polycaprolactone polyurethane networks.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Bothe, Martin , Mya, Khine Yi , Jie Lin, Esther Marie , Yeo, Chee Chuan , Lu, Xuehong , He, Chaobin , Pretsch, Thorsten . 2555. "Triple-shape properties of star-shaped POSS-polycaprolactone polyurethane networks".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Bothe, Martin , Mya, Khine Yi , Jie Lin, Esther Marie , Yeo, Chee Chuan , Lu, Xuehong , He, Chaobin , Pretsch, Thorsten . "Triple-shape properties of star-shaped POSS-polycaprolactone polyurethane networks."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Bothe, Martin , Mya, Khine Yi , Jie Lin, Esther Marie , Yeo, Chee Chuan , Lu, Xuehong , He, Chaobin , Pretsch, Thorsten . Triple-shape properties of star-shaped POSS-polycaprolactone polyurethane networks. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.