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STRENGTHENING POLYMER INTERFACES OF ...

Cornell University.

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STRENGTHENING POLYMER INTERFACES OF IMMISCIBLE HOMOPOLYMERS WITH COPOLYMER ADDITIVES.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	STRENGTHENING POLYMER INTERFACES OF IMMISCIBLE HOMOPOLYMERS WITH COPOLYMER ADDITIVES./
Author:	Dai, Chi-An.
Description:	195 p.
Notes:	Source: Dissertation Abstracts International, Volume: 57-04, Section: B, page: 2795.
Contained By:	Dissertation Abstracts International57-04B.
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=9625303

STRENGTHENING POLYMER INTERFACES OF IMMISCIBLE HOMOPOLYMERS WITH COPOLYMER ADDITIVES.
Dai, Chi-An.

STRENGTHENING POLYMER INTERFACES OF IMMISCIBLE HOMOPOLYMERS WITH COPOLYMER ADDITIVES. - 195 p.

Source: Dissertation Abstracts International, Volume: 57-04, Section: B, page: 2795.

Thesis (Ph.D.)--Cornell University, 1996.

The effect of addition of diblock copolymers, triblock copolymers and random copolymers on the fracture toughness, Subjects--Topical Terms:

560527
Chemistry, Physical.

STRENGTHENING POLYMER INTERFACES OF IMMISCIBLE HOMOPOLYMERS WITH COPOLYMER ADDITIVES.
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035 $a AAI9625303
040 $a UMI $c UMI
100 1 $a Dai, Chi-An. $3 1025066
245 1 0 $a STRENGTHENING POLYMER INTERFACES OF IMMISCIBLE HOMOPOLYMERS WITH COPOLYMER ADDITIVES.
300 $a 195 p.
500 $a Source: Dissertation Abstracts International, Volume: 57-04, Section: B, page: 2795.
502 $a Thesis (Ph.D.)--Cornell University, 1996.
520 $a The effect of addition of diblock copolymers, triblock copolymers and random copolymers on the fracture toughness, $g \sb{c}$ of an interface between the immiscible homopolymers polystyrene (PS) and poly(2-vinylpyridine) (PVP) was studied as a function of the areal chain density, $\Sigma$, the molecular weight and monomer ratio, f of the copolymer at the interface. Mechanisms of interfacial failure included chain pull-out or chain scission of the copolymers (low $g \sb{c}$ values) and crazing of the homopolymer (high $g \sb{c}$ values). The failure mechanisms deduced from forward recoil spectrometry (FRES) and transmission electron microscopy (TEM) measurement were used to deduce chain conformation of the copolymer chains at the interface.
520 $a We show that most of the triblock copolymers form a "staple" structure at the interface with the PS block forming a loop on the PS side of the interface and the PVP ends anchoring the "staple" in the PVP side. The transition from chain scission to crazing for triblock copolymers occurs at a $\Sigma\sp*$ = 0.015 chains/nm$\sp2$, half that for diblock copolymers. At high $\Sigma$, the triblock copolymers reinforce the craze fibrils at the crack tip better than the corresponding diblock copolymers leading to an interface $g \sb{c}$ approaching that of the PS homopolymer itself.
520 $a Long symmetric random copolymers ( $f \approx 0.48$) are shown to be effective in strengthening the interfaces. The effectiveness of the random copolymer at low areal chain densities results from each chain establishing multiple covalent connections across the interface. The high fracture toughness of the polymerization is likely to be due to the composition drift during the polymerization of the random copolymer. The effectiveness of the random copolymer decreases significantly as f deviates from 0.5.
520 $a In the crazing regime, the $g \sb{c}$ of an interface strengthened with long diblock copolymers increases sharply with number average molecular weight $\=M\sb{n}$ of the homopolymer PS around $\=M\sb{n}\approx 100,000$, leveling off at higher $\=M\sb{n}$. By comparing polydisperse and monodisperse PS, $\=M\sb{n}$ is shown to be the controlling parameter.
590 $a School code: 0058.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Plastics Technology. $3 1023683
690 $a 0494
690 $a 0495
690 $a 0794
690 $a 0795
710 2 $a Cornell University. $3 530586
773 0 $t Dissertation Abstracts International $g 57-04B.
790 $a 0058
791 $a Ph.D.
792 $a 1996
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=9625303