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Strength development and diffusion in symmetric and asymmetric pairs of amorphous COCs in the vicinity of Tg : a new modified temperature–pressure dependent model

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Strength development and diffusion in symmetric and asymmetric pairs of amorphous COCs in the vicinity of Tg : a new modified temperature–pressure dependent model
นักวิจัย : Wang, Z. Y. , Yue, Chee Yoon , Roy, S.
คำค้น : -
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Wang, Z. Y., Yue, C. Y., & Roy, S. (2012). Strength development and diffusion in symmetric and asymmetric pairs of amorphous COCs in the vicinity of Tg : a new modified temperature–pressure dependent model. Polymer, 53(9), 1932-1938. , 0032-3861 , http://hdl.handle.net/10220/10546 , http://dx.doi.org/10.1016/j.polymer.2012.03.007
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Polymer
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The strength development and healing of symmetric and asymmetric interfaces of amorphous cyclic olefin copolymers (COC) was studied by assessment of diffusion and lap-shear strength measurement of samples bonded at different temperatures, pressures and healing times. Amorphous COCs comprise copolymers of norbornene and ethylene whereby COCs with differing norbornene content have different glass transition temperature (Tg) and molecular weight. For similar thermal bonding conditions near Tg, the symmetric pairs have larger bond strength than asymmetric pairs. The activation energy calculated using Arrhenius model was independent of molecular weight and norbornene content. The free volume of COCs increased with norbornene content. In the asymmetric pairs, the adherend consisting of the COC grade with lower Tg and larger free volume dominated the diffusion compared to the other COC adherend. The penetration depth for molecular diffusion calculated using the Flory–Huggins theory was consistent with that estimated using the experimental values of the radius of gyration and bond strength. A new modified model that incorporates the combined effects of pressure, temperature and healing time could be used to predict the bond strength of both symmetric and asymmetric COC joints. Moreover, the new model facilitates determination of more reliable values of the activation energy.

บรรณานุกรม :
Wang, Z. Y. , Yue, Chee Yoon , Roy, S. . (2555). Strength development and diffusion in symmetric and asymmetric pairs of amorphous COCs in the vicinity of Tg : a new modified temperature–pressure dependent model.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Wang, Z. Y. , Yue, Chee Yoon , Roy, S. . 2555. "Strength development and diffusion in symmetric and asymmetric pairs of amorphous COCs in the vicinity of Tg : a new modified temperature–pressure dependent model".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Wang, Z. Y. , Yue, Chee Yoon , Roy, S. . "Strength development and diffusion in symmetric and asymmetric pairs of amorphous COCs in the vicinity of Tg : a new modified temperature–pressure dependent model."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Wang, Z. Y. , Yue, Chee Yoon , Roy, S. . Strength development and diffusion in symmetric and asymmetric pairs of amorphous COCs in the vicinity of Tg : a new modified temperature–pressure dependent model. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.