MECHANICAL DYNAMIC PROPERTIES OF A MAIN-CHAIN LIQUID-CRYSTALLINE COPOLYETHER .2. INFLUENCE OF THE MOLECULAR-WEIGHT

被引：1

作者：

ASSMAN, K ^{[1
]}

SCHNEIDER, HA ^{[1
]}

机构：

[1] UNIV FREIBURG,FREIBURGER MAT FORSCHUNGSZENTRUM,W-7800 FREIBURG,GERMANY

来源：

MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1993年 / 231卷

关键词：

NEMATIC MAIN CHAIN COPOLYETHER; RHEOLOGY; STATIONARY STATES; TIME-TEMPERATURE SUPERPOSITION;

D O I：

10.1080/10587259308032491

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The study of the molecular weight dependence of the mechanical dynamic properties of the LC co-polyether-poly(4,4'-dihydroxy-alpha-methylstilbene-hexyl(nonyl)methylene)-has evidenced that the times of adaption for the realization of rheological stationary states increases substantially with the molecular weight of the copolymer: from 2 days for the copolymer with M(n) = 5,800 to 7 days for the copolymer with M(n) = 16,400. The rheological stationary states are characterized by constant and reproducible values of the moduli. The stationary states realized after prolonged annealing show that G' > G'', whereas the stationary states attained after shear show G'' > G'. The time-temperature superposition procedure applies only for the latter data.

引用

页码：45 / 55

页数：11

共 10 条

[1]

ASSMANN K, MOL CRYST LIQ CRYST

[2] NEMATIC ORDER IN POLYESTERS WITH FLEXIBLE MOIETIES IN THE MAIN CHAIN [J].

BLUMSTEIN, A .

POLYMER JOURNAL, 1985, 17 (01) :277-288

[3] INFLUENCE OF MOLECULAR-WEIGHT ON PHASE-TRANSITIONS AND ALIGNMENT OF A THERMOTROPIC NEMATIC POLYESTER [J].

BLUMSTEIN, RB ;

STICKLES, EM ;

GAUTHIER, MM ;

BLUMSTEIN, A ;

VOLINO, F .

MACROMOLECULES, 1984, 17 (02) :177-183

[4]

LENZ RW, 1984, ADV POLYM SCI, V59, P103

[5] SYNTHESIS, CHARACTERIZATION AND RECENT DEVELOPMENTS OF LIQUID-CRYSTALLINE POLYMERS [J].

NOEL, C .

MAKROMOLEKULARE CHEMIE-MACROMOLECULAR SYMPOSIA, 1988, 22 :95-139

[6] FUNCTIONAL POLYMERS AND SEQUENTIAL COPOLYMERS BY PHASE-TRANSFER CATALYSIS .25. TRANSFORMATION OF A MONOTROPIC MESOPHASE INTO AN ENANTIOTROPIC ONE BY INCREASING THE MOLECULAR-WEIGHT OF THE POLYMER AND BY COPOLYMERIZATION [J].

PERCEC, V ;

NAVA, H .

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 1987, 25 (01) :405-431

[7] FUNCTIONAL POLYMERS AND SEQUENTIAL COPOLYMERS BY PHASE-TRANSFER CATALYSIS .10. POLYETHERS OF MESOGENIC BISPHENOLS - A NEW CLASS OF MAIN-CHAIN LIQUID-CRYSTALLINE POLYMERS [J].

PERCEC, V ;

SHAFFER, TD ;

NAVA, H .

JOURNAL OF POLYMER SCIENCE PART C-POLYMER LETTERS, 1984, 22 (12) :637-647

[8] FUNCTIONAL POLYMERS AND SEQUENTIAL COPOLYMERS BY PHASE-TRANSFER CATALYSIS .24. THE INFLUENCE OF MOLECULAR-WEIGHT ON THE THERMOTROPIC PROPERTIES OF A RANDOM COPOLYETHER BASED ON 1,5-DIBROMOPENTANE,1,7-DIBROMOHEPTANE, AND 4,4'-DIHYDROXY-ALPHA-METHYLSTILBENE [J].

PERCEC, V ;

NAVA, H ;

JONSSON, H .

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 1987, 25 (07) :1943-1965

[9] FUNCTIONAL POLYMERS AND SEQUENTIAL COPOLYMERS BY PHASE-TRANSFER CATALYSIS .9. SYNTHESIS AND CHARACTERIZATION OF ALPHA,OMEGA-DI[2-(P-PHENOXY)-2-OXAZOLINE] OLIGOMERS [J].

PERCEC, V ;

NAVA, H ;

RODRIGUEZPARADA, JM .

JOURNAL OF POLYMER SCIENCE PART C-POLYMER LETTERS, 1984, 22 (10) :523-532

[10]

PERCEC V, 1985, MAKROMOL CHEM-RAPID, V6, P97

← 1 →