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The melting behavior and crystallization kinetics of PBNT copolyesters were studied using differential scanning calorimetry (d.s.c.) The Avrami exponent, n, increased from 2.5 to 3.0 with increasing of annealing temperature between 161°C and 170°C. The Avrami rate constant K increased with...
The synthesis and characterization of 2,2′-dimethyl-4-methoxy-((11-vinyloxy)undecanyloxy-4-bezoyl)ester biphenyl ( 7 ), its cationic polymerization to side chain liquid crystalline polymers with relative number average degrees of polymerization (DP) of 2, 8 and 19 are presented. The mesogenic...
New heterophasic copolymers with high rubber content have been synthesized by combining heterogeneous Ti-based catalysts with metallocenes. The molecular, morphological and mechanical features of these materials were evaluated: it was pointed out that the new copolymers, having more than 60Wt.%...
A series of polyacrylamide (PAAm) gels were prepared by free-radical crosslinking copolymerization of acrylamide and N,N′-methylenebis(acrylamide) (BAAm) in water at various crosslinker (BAAm) and chain transfer agent (isopropyl alcohol, IPA) concentrations. It was shown that only 5 % of the...
Liquid crystalline poly(heptene sulphone)s containing cholesteryl undecylenic ester and cholestanyl undecylenic ester were synthesized. The polymers displayed cholesteric mesophases during thermal transition. The clearing temperatures were from 114 to 172°C depending on the molar ratio of...
This paper presents the fracture behaviour of a thermoplastic elastomer, HYTREL 5556. Since with this material it is not possible to successfully apply the LEFM nor the EPFM, it has been studied by following the ESIS protocol for determining the essential work of fracture in plane stress and...
A nematic liquid crystalline polymalonate has been synthesized by melt polycondensation of a nonlinear optical (NLO) monomer and a liquid crystalline (LC) monomer. The polymer was characterized by VPO, FTIR, DSC, WAXD, UV-visible spectroscopy and polarized optical microscopy. The LC temperature...
A new method for the determination of the volume fraction v ƒ of fibrils formed inside the crazes in polymers before their brittle fracture has been proposed. The method utilizes small-angle X-ray scattering measured on an absolute scale in combination with the precise measurement of the sample...
The rotational isomeric state (RIS) model was used to calculate the molecular dimensions of poly(ethylene isophthalate) (PEI) and poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) by introducing new description for aromatic segments and by adopting the statistical weight parameters of PET. The...
The free radical copolymerization of N-maleyl glycine (MG) with vinylpyrrolidone (NVP) was studied in the range from 10 to 90 mol% in the feed. Copolymer compositions obtained by elemental analysis reflect the monomer feed concentrations. The r 1 and r 2 were determined by the Fineman-Ross and...
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