BINARY BLENDS OF NYLONS WITH ETHYLENE VINYL ALCOHOL COPOLYMERS - MORPHOLOGICAL, THERMAL, RHEOLOGICAL, AND MECHANICAL-BEHAVIOR

被引:35
作者
AHN, TO
KIM, CK
KIM, BK
JEONG, HM
HUH, JD
机构
[1] PUSAN NATL UNIV,DEPT POLYMER SCI & ENGN,PUSAN 609735,SOUTH KOREA
[2] UNIV ULSAN,DEPT CHEM,ULSAN 680749,SOUTH KOREA
[3] POHANG INST SCI & TECHNOL,DEPT CHEM ENGN,POHANG 790600,SOUTH KOREA
关键词
D O I
10.1002/pen.760300605
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Binary blends of ethylene vinyl alcohol copolymers, containing 62 (EVOH‐62) and 71 (EVOH‐71) mole percent vinyl alcohols, with nylons (nylon‐6, nylon‐6/12, and nylon‐12) have been prepared from melt mixing in a twin screw compounding machine. Morphological, thermal, rheological, and mechanical properties were determined. EVOH‐62/nylon‐6 and EVOH‐71/nylon‐6 blends showed homogeneous phase morphologies in the nylon‐6‐rich region, and fine phase separations (c.a. 2 × 10−7 m) in the EVOH‐rich region. Melting point depression, positive deviations in viscosity and flexural modulus, and negative deviation in impact strength from the simple additive rule were generally observed. And the results were possibly interpreted in terms of compatibility and increased nylon/EVOH interactions over the nylon/nylon interactions. On the contrary, clean phase separations in large domains were observed from EVOH‐71/nylon‐6/12 and EVOH‐71 /nylon‐12 blends. Fibrillation was also obtained from EVOH rich blends. Probably due to the incompatible nature of these blends, yield at low rate of shear and a mechanical property drop were also observed. Copyright © 1990 Society of Plastics Engineers
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页码:341 / 349
页数:9
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