Polymer crosslinking controlled by release of catalyst encapsulated in polycarbonate micro-spheres

被引：18

作者：

Deyrail, Y ^{[1
]}

Zydowicz, N ^{[1
]}

Cassagnau, P ^{[1
]}

机构：

[1] Univ Lyon 1, Lab Mat Polymeres & Biomat, UMR5627, F-69622 Villeurbanne, France

来源：

POLYMER | 2004年 / 45卷 / 18期

关键词：

crosslinking; rheology; encapsulation;

D O I：

10.1016/j.polymer.2004.06.064

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

EVA crosslinking by ester-silane exchange reaction, controlled by catalyst released from polycarbonate micro-particles, was studied from rheological experiments. Firstly, dibutyltim dilaurate in polycarbonate (PC) (DBTDL) catalyst was encapsulated in polycarbonate micro-particles by an emulsion process. These PC micro-particles have a trimodal size distribution with a mean diameter around 25 mum. Furthermore, scanning electronic microscopy analysis revealed that the DBTDL catalyst is homogeneously dispersed in PC micro-particles. This was verified by DSC experiments which showed a T-g equal to 72 degreesC for the DBTL micro-particles. Secondly, the deformation and break-up studies of PC micro-particles in molten EVA matrix showed that PC micro-particles can only break up in EVA matrix of high molecular weight (EVA28-03) and for temperatures higher than 200 degreesC. Thirdly, rheological experiments showed that the crosslink reaction is controlled by the diffusion rate of DBTDL from PC micro-particles. However, this diffusion rate was observed to be independent on either the temperature or the PC micro-particles size. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：6123 / 6131

页数：9

共 14 条

[1] MICROSPHERES AND MICROCAPSULES, A SURVEY OF MANUFACTURING TECHNIQUES .3. SOLVENT EVAPORATION [J].

ARSHADY, R .

POLYMER ENGINEERING AND SCIENCE, 1990, 30 (15) :915-924

[2] A PHYSICOCHEMICAL STUDY OF THE MORPHOLOGY OF PROGESTERONE-LOADED POLY (D,L-LACTIDE) MICROSPHERES [J].

BENOIT, JP ;

COURTEILLE, F ;

THIES, C .

INTERNATIONAL JOURNAL OF PHARMACEUTICS, 1986, 29 (2-3) :95-102

[3] SOLVENT SELECTION IN THE PREPARATION OF POLY(DL-LACTIDE) MICROSPHERES PREPARED BY THE SOLVENT EVAPORATION METHOD [J].

BODMEIER, R ;

MCGINITY, JW .

INTERNATIONAL JOURNAL OF PHARMACEUTICS, 1988, 43 (1-2) :179-186

[4] New transesterification between ester and alkoxysilane groups:: application to ethylene-co-vinyl acetate copolymer crosslinking [J].

Bounor-Legaré, V ;

Ferreira, I ;

Verbois, A ;

Cassagnau, P ;

Michel, A .

POLYMER, 2002, 43 (23) :6085-6092

[5] CO-CROSS-LINKING OF ETHYLENE VINYL-ACETATE AND ETHYLENE ACRYLIC ESTER COPOLYMERS BY TRANSESTERIFICATION - CHEMICAL AND RHEOLOGICAL STUDIES OF KINETICS [J].

CASSAGNAU, P ;

BERT, M ;

VERNEY, V ;

MICHEL, A .

POLYMER, 1993, 34 (01) :124-131

[6]

Choi JK, 2001, J IND ENG CHEM, V7, P358

[7] Morphology in immiscible polymer blends during solidification of an amorphous dispersed phase under shearing [J].

Deyrail, Y ;

Michel, A ;

Cassagnau, P .

CANADIAN JOURNAL OF CHEMICAL ENGINEERING, 2002, 80 (06) :1017-1027

[8] CHARACTERIZATION OF CROSS-LINKING OF RANDOM POLYMER NETWORK BY RHEOLOGICAL AND EQUILIBRIUM SWELLING DATA [J].

ESPINASSE, I ;

CASSAGNAU, P ;

BERT, M ;

MICHEL, A .

JOURNAL OF APPLIED POLYMER SCIENCE, 1994, 54 (13) :2083-2089

[9] PDLLA microspheres containing steroids: spray-drying, o/w and w/o/w emulsifications as preparation methods [J].

Giunchedi, P ;

Alpar, HO ;

Conte, U .

JOURNAL OF MICROENCAPSULATION, 1998, 15 (02) :185-195

[10]

MILLER DR, 1988, J POLYM SCI B, V26

← 1 2 →