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Effects of processing condition on the surface segregation of s-BPDA/ODA polyimide and silicone-containing block copolyimide blends

หน่วยงาน จุฬาลงกรณ์มหาวิทยาลัย

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ชื่อเรื่อง : Effects of processing condition on the surface segregation of s-BPDA/ODA polyimide and silicone-containing block copolyimide blends
นักวิจัย : Wanpen Benjapan
คำค้น : Polyimides
หน่วยงาน : จุฬาลงกรณ์มหาวิทยาลัย
ผู้ร่วมงาน : Chirakarn Muangnapoh , Soontorn Stapornkul , Chulalongkorn University. Faculty of Engineering
ปีพิมพ์ : 2548
อ้างอิง : 9745325708 , http://cuir.car.chula.ac.th/handle/123456789/4648
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : -
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บทคัดย่อ/คำอธิบาย :

Thesis (M.Eng.)--Chulalongkorn University, 2005

This research aims to investigate the effect of processing condition on surface segregation of polyimide blends based on 3,3',4,4'-biphenyltetracarboxylic dianhydride (S-BPDA)/4,4'-diaminodiphenylether (ODA) polyimide and silicone-containing block copolyimide (BSF30). The polyimide was synthesized by a conventional two-step method via poly(amic acid) (PAA) precursor in N-methyl-2pyrrolidinone (NMP) solvent. These polyimide blends, having various compositions of the silicone-containing block copolyimide, were processed by the solution casting method then undergone thermal imidization to yield the solid films. The DSC thermograms of the polyimide blends disclose the glass transition temperatures of BSF30 to be 165degrees Celsius and that of the s-BPDA/ODA polyimide to be about 272degrees Celsius. Furthermore, DSC, TGA and DMA results revealed that thermal and mechanical properties of the blended films containing a few part per hundred (0.5-5 phr) of BSF30 were not difference from s-BPDA/ODA polyimide. Their surface characterizations were performed using Atomic force microscopy (AFM), X-ray photoelectron spectroscopic measurement (XPS), Attenuated total reflection Fourier transforms infrared (ATR-FTIR) technique, and contact angle measurements. Those techniques revealed that the surface segregation typed phase separation occurred between the two polymers. The type of substrate used in the film-casting process shows significant effect on the migration of surface segregated species with the relatively non-polar silicone-containing system enriching on the air exposed surface and vice versa. This phenomenon was revealed by ATR-FTIR spectroscopy when a relatively high BSF30 concentration was used i.e. 30 phr. Moreover, XPS disclosed that at low BSF30 concentration, siloxane segregated to the air side surface. The contact angle measurement indicated an enrichment to the hydrophobic siloxane segment segment in the blend films surface of the BSF30. The average water contact angle of glass side surface was 77degrees Celsius while that of the air side was about 102 degrees Celsius in every blending ratio. These behaviors confirm the surface segregation phase separation in this blending pair

บรรณานุกรม :
Wanpen Benjapan . (2548). Effects of processing condition on the surface segregation of s-BPDA/ODA polyimide and silicone-containing block copolyimide blends.
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Wanpen Benjapan . 2548. "Effects of processing condition on the surface segregation of s-BPDA/ODA polyimide and silicone-containing block copolyimide blends".
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Wanpen Benjapan . "Effects of processing condition on the surface segregation of s-BPDA/ODA polyimide and silicone-containing block copolyimide blends."
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย, 2548. Print.
Wanpen Benjapan . Effects of processing condition on the surface segregation of s-BPDA/ODA polyimide and silicone-containing block copolyimide blends. กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย; 2548.