Use of coupling agents to enhance the interfacial interactions in starch-EVOH/hydroxylapatite composites

被引:63
作者
Vaz, CM [1 ]
Reis, RL [1 ]
Cunha, AM [1 ]
机构
[1] Univ Minho, Dept Polymer Engn, P-4800058 Guimaraes, Portugal
关键词
interface; biomaterials; composites; coupling agents; biodegradable; mechanical properties; bone replacement;
D O I
10.1016/S0142-9612(01)00150-8
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Different zirconate, titanate and silane coupling agents were selected in an effort to improve the mechanical properties of starch and ethylene-vinyl alcohol copolymer (EVOH)/hydroxylapatite (HA) composites, through the enhancement of the filler particles-polymer matrix interactions and the promotion of the interfacial adhesion between these two phases. The mechanical performance was assessed by tensile tests and discussed on the basis of the respective interfacial morphology (evaluated by scanning electron microscopy). The main relevant parameters were found to be the surface properties and reactivity of the filler (non-sintered HA) and the chemical nature (pH and type of metallic centre) of the added coupling agent. Significant improvements in the stiffness were achieved (about 30% increase in the modulus) when using the acidic zirconate coupling agents. The acidic zirconate combined the capability of crosslinking the polymer matrix with the establishment of donor-acceptor interactions and hydrogen bonding between it and the ceramic particles, leading to very good interfacial adhesion. The optimization of these coupling processes associated with the introduction of higher amounts of filler, may be an effective way to produce composites with mechanical properties analogous to those of the human cortical bone. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:629 / 635
页数:7
相关论文
共 35 条
[1]  
ADRIANO KP, 1994, J APPL BIOMATER, V5, P133
[2]  
Chiang WY, 1999, J APPL POLYM SCI, V71, P865, DOI 10.1002/(SICI)1097-4628(19990207)71:6<865::AID-APP2>3.0.CO
[3]  
2-R
[4]   EVALUATION OF ABSORBABLE POLY(ORTHO ESTERS) FAR USE IN SURGICAL IMPLANTS [J].
DANIELS, AU ;
ANDRIANO, KP ;
SMUTZ, WP ;
CHANG, MKO ;
HELLER, J .
JOURNAL OF APPLIED BIOMATERIALS, 1994, 5 (01) :51-64
[5]   Hydroxyapatite polyethylene composites: Effect of grafting and surface treatment of hydroxyapatite [J].
Deb, S ;
Wang, M ;
Tanner, KE ;
Bonfield, W .
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE, 1996, 7 (04) :191-193
[6]   Possible coupling reactions of functional silanes and polypropylene [J].
Demjén, Z ;
Pukánszky, B ;
Nagy, J .
POLYMER, 1999, 40 (07) :1763-1773
[7]  
Dupraz AMP, 1996, J BIOMED MATER RES, V30, P231, DOI 10.1002/(SICI)1097-4636(199602)30:2<231::AID-JBM13>3.0.CO
[8]  
2-P
[9]   Biocompatibility screening of silane-treated hydroxyapatite powders, for use as filler in resorbable composites [J].
Dupraz, AMP ;
vandenMeer, SAT ;
DeWijn, JR ;
Goedemoed, JH .
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE, 1996, 7 (12) :731-738
[10]   APPLYING A CALCIUM-PHOSPHATE LAYER ON PEO/PBT COPOLYMERS AFFECTS BONE-FORMATION IN-VIVO [J].
GAILLARD, ML ;
VANDENBRINK, J ;
VANBLITTERSWIJK, CA ;
LUKLINSKA, ZB .
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE, 1994, 5 (6-7) :424-428