Preparation and Characterization of Poly(Lactic Acid)-g-Maleic Anhydride plus Starch Blends

被引：95

作者：

Orozco, Victor H. ^{[1
,2
]}

Brostow, Witold ^{[2
]}

Chonkaew, Wunpen ^{[2
]}

Lopez, Betty L. ^{[1
]}

机构：

[1] Univ Antioquia, Grp Ciencia Mat, Antioquia, Colombia

[2] Univ N Texas, Dept Mat Sci & Engn, LAPOM, Denton, TX 76203 USA

来源：

MACROMOLECULAR SYMPOSIA | 2009年 / 277卷

关键词：

blends; brittleness; dynamical mechanical analysis; grafting; polylactic acid; starch; tribological properties; PEROXY DERIVATIVES; EPOXY; ACID); RESINS; POLYMERIZATION; CRYSTALS; POLYMERS; FRICTION; DEPTH; WEAR;

D O I：

10.1002/masy.200950309

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 [高分子化学与物理];

摘要：

Poly(lactic acid) (PLA) and starch copolymers are obtained by reactive blending - varying the starch compositions from 0 to 60%. PLA is functionalized with maleic anhydride (MA), obtaining PLA-g-MA copolymers using dicumyl peroxide as an initiator of grafting in order to improve the compatibility and interfacial adhesion between the constituents. PLA + starch blends without a compatibilizer do not have sufficient interfacial adhesion. Decomposition temperature of PLA is not affected by grafting. Glass transition temperatures and dynamic mechanical properties are affected since MA has a plasticizing effect. Along with an increasing starch content friction decreases while wear loss volume in pin-on-disk tribometry has a minimum at nominal 15% wt. starch but increases at higher starch concentrations. The residual depth in scratching and sliding wear testing has a maximum at 15% starch; there is a minimum of storage modulus E' determined in dynamic mechanical testing at the same concentration. Microhardness results also reflect the plasticization by MA.

引用

页码：69 / 80

页数：12

共 45 条

[1]

Peroxy derivatives of epoxy resins based on bisphenol A: Effects of quaternary ammonium salts [J].