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Study of phase separation in blends ...

Sethumadhavan, Murali.

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Study of phase separation in blends of semi-flexible and flexible coil polymers.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Study of phase separation in blends of semi-flexible and flexible coil polymers./
作者:	Sethumadhavan, Murali.
面頁冊數:	129 p.
附註:	Director: Richard S. Stein.
Contained By:	Dissertation Abstracts International57-02B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9619436

Study of phase separation in blends of semi-flexible and flexible coil polymers.
Sethumadhavan, Murali.

Study of phase separation in blends of semi-flexible and flexible coil polymers. - 129 p.

Director: Richard S. Stein.

Thesis (Ph.D.)--University of Massachusetts Amherst, 1996.

A series of semi-flexible, wholly-aromatic, para-linked polyamides were synthesized at Polaroid Corporation for various optical applications. These polymers were unique in the fact that they exhibited rodlike nature and were soluble in common solvents as well. This unique property was found to be due to the presence of 2,2$\sp\prime$-disubstituted biphenyl group in the backbone of these materials. Blends of one of these polymers(PolymerI) and flexible poly(4-vinyl pyridine) were prepared by using solution blending and semi-interpenetrating network (SIN) formation methods. Both the methods of blends preparation gave rise to completely transparent and clear films over a wide range of composition of polymerI.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Study of phase separation in blends of semi-flexible and flexible coil polymers.
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100 1 $a Sethumadhavan, Murali. $3 1254551
245 1 0 $a Study of phase separation in blends of semi-flexible and flexible coil polymers.
300 $a 129 p.
500 $a Director: Richard S. Stein.
500 $a Source: Dissertation Abstracts International, Volume: 57-02, Section: B, page: 1421.
502 $a Thesis (Ph.D.)--University of Massachusetts Amherst, 1996.
520 $a A series of semi-flexible, wholly-aromatic, para-linked polyamides were synthesized at Polaroid Corporation for various optical applications. These polymers were unique in the fact that they exhibited rodlike nature and were soluble in common solvents as well. This unique property was found to be due to the presence of 2,2$\sp\prime$-disubstituted biphenyl group in the backbone of these materials. Blends of one of these polymers(PolymerI) and flexible poly(4-vinyl pyridine) were prepared by using solution blending and semi-interpenetrating network (SIN) formation methods. Both the methods of blends preparation gave rise to completely transparent and clear films over a wide range of composition of polymerI.
520 $a The blends were characterized by thermal, spectroscopic, microscopic and scattering techniques. The amorphous nature of polymerI with no detectable glass transition temperature and small electron density and refractive index difference between two polymers precluded the attempts to get any quantitative information on the size of the phases in the blends. The Fourier-Transform infra-red results showed that there were hydrogen bonding interactions between two polymers.
520 $a A second blend system containing another para-linked polyamide (PolymerII) was studied to obtain information about phase morphology. The flexible polymer used was poly(N-vinylpyrollidone). This system also gave rise to completely transparent films. The FTIR results indicated that there were hydrogen bonding interactions between the two polymers. Light scattering and cloud point measurements were able to detect the phase separation in the system. The light scattering measurements and the theoretical model used to analyze the results did not match very well. The reason for this was believed to be due to mixed composition of the phase separated regimes. The compositions of the phases were measured by comparing the turbidity values obtained from the theoretical model and the UV-transmittance measurements. It was found that composition of one of the phases had to be around 72/28(polymer1/polymer2) to account for the experimentally observed transmittace value. This led to the belief that even the phase separated regimes probably contained both polymers and the final refractive index difference between the phases was not large enough to give rise to cloudy films. TEM results confirmed the presence of phase separation in the system.
590 $a School code: 0118.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Plastics Technology. $3 1023683
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710 2 0 $a University of Massachusetts Amherst. $3 1019433
773 0 $t Dissertation Abstracts International $g 57-02B.
790 $a 0118
790 1 0 $a Stein, Richard S., $e advisor
791 $a Ph.D.
792 $a 1996
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9619436