Evaluation of the degree of exfoliation in poly(ε-caprolactone)/organoclay nanocomposites based on viscoelastic relaxation

被引：11

作者：

Chung, Jae Woo ^{[1
]}

Oh, Kwang Sei ^{[1
]}

Kwak, Seung-Yeop ^{[1
]}

机构：

[1] Seoul Natl Univ, Sch Mat Sci & Engn, HOMRC, Seoul 151744, South Korea

来源：

MACROMOLECULAR MATERIALS AND ENGINEERING | 2007年 / 292卷 / 05期

关键词：

activation energy; dynamic mechanical measurement; linear viscoelastic behavior; nanocomposite; poly(epsilon-caprolactone);

D O I：

10.1002/mame.200600451

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Poly(epsilon-caprolactone) nanocomposites, PCLOC25A and PCLOC30B, with organoclays (M) having nonpolar and polar organic modifiers, respectively, were prepared by the melt mixing method and additional heat treatment. WXRD analysis revealed that both nanocomposites were exfoliated, irrespective of the OC polarity. However, WXRD failed to show the degree of exfoliation of the nanocomposites, because the d(001) peaks disappeared. Thus, dynamic mechanical analysis (DMA) was carried out to compare the degree of exfoliation of the PCL nanocomposites. From DMA, PCLOC30B showed higher elasticity, storage moduli, viscosity, and activation energy than PCLOC25A, indicating that PCLOC30B had a more exfoliated structure than PCLOC25A. This is due to the polar interaction in PCLOC30B, as verified by the plots of a(T) versus temperature. Thus, it was confirmed that DMA provides an alternative approach to evaluating the degree of exfoliation of nanocomposites.

引用

页码：627 / 633

页数：7

共 16 条

[1]

[Anonymous], 1980, VISCOELASTIC PROPERT

[2] A thermotropic main-chain random copolyester containing flexible spacers of differing lengths .2. Rheological behavior [J].

Chang, S ;

Han, CD .

MACROMOLECULES, 1997, 30 (06) :1656-1669

[3]

Giannelis EP, 1999, ADV POLYM SCI, V138, P107

[4] DETERMINATION OF THE ORDER-DISORDER TRANSITION-TEMPERATURE OF BLOCK COPOLYMERS [J].

HAN, CD ;

KIM, JW ;

KIM, JK .

MACROMOLECULES, 1989, 22 (01) :383-394

[5] Poly (L-lactic acid)/layered silicate nanocomposite: Fabrication, characterization, and properties [J].

Krikorian, V ;

Pochan, DJ .

CHEMISTRY OF MATERIALS, 2003, 15 (22) :4317-4324

[6] Rheology of end-tethered polymer layered silicate nanocomposites [J].

Krishnamoorti, R ;

Giannelis, EP .

MACROMOLECULES, 1997, 30 (14) :4097-4102

[7] Effect of thermal history on structural changes in melt-intercalated poly(ε-caprolactone)/organoclay nanocomposites investigated by dynamic viscoelastic relaxation measurements [J].

Kwak, SY ;

Oh, KS .

MACROMOLECULAR MATERIALS AND ENGINEERING, 2003, 288 (06) :503-508

[8] Rheology of organoclay nanocomposites: Effects of polymer matrix/organoclay compatibility and the gallery distance of organoclay [J].

Lee, KM ;

Han, CD .

MACROMOLECULES, 2003, 36 (19) :7165-7178

[9] Preparation and interaction characteristics of organically modified montmorillonite nanocomposite with miscible polymer blend of poly(ethylene oxide) and poly(methyl methacrylate) [J].

Lim, SK ;

Kim, JW ;

Chin, I ;

Kwon, YK ;

Choi, HJ .

CHEMISTRY OF MATERIALS, 2002, 14 (05) :1989-1994

[10] Structure-property relationship in biodegradable poly(butylene succinate)/layered silicate nanocomposites [J].

Ray, SS ;

Okamoto, K ;

Okamoto, M .

MACROMOLECULES, 2003, 36 (07) :2355-2367

← 1 2 →