Polymer Bulletin
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Different Crystalline Transition Behavior in Polyamides 12 16,lO 16 and 8 16
Polymer Bulletin - Tập 49 - Trang 387-394 - 2003
Crystalline transition behavior of polyamides 12 16, 10 16 and 8 16 was studied systematically by variable-temperature WAXD and real-time FTIR. It is surprising that the crystalline transition behavior of these polyamides is different from one another. Brill transition was observed before melting on heating for nylon 8 16 in both single crystal and melt-crystallized samples. For nylon 12 16, Bril......
Synthesis and polymerization of 1,5-bis(N-carbazolyl)pentane with its structural and behavioral highlights
Polymer Bulletin - Tập 77 - Trang 1205-1216 - 2019
Carbazole, the well-known electron donor and hole-transporting organic light-emitting molecule was modified into 1,5-bis[N-carbazolyl]pentane (1,5-BNCP) by introducing the saturated pentane spacer. Such insertion fixed the certain space between growing polymer chains and demonstrated π–π stacking effect over its morphology and structure. Its contribution in improving the thermal stability and phot......
Polymerization temperature effects on the properties of l-lactide and ε-caprolactone copolymers
Polymer Bulletin - Tập 25 - Trang 335-341 - 1991
The large difference in reactivity of L-lactide and ε-caprolactone in ring opening polymerization with stannous octoate, leads to the formation of copolymers with blocky structures. By varying the polymerization temperature, copolymers with different average sequence lengths and molecular weights can be synthesized. It is shown that the average monomer sequence length has a large effect on the the......
Preparation, characterization and properties of liquid natural rubber with low non-rubber content via photodegradation
Polymer Bulletin - Tập 78 - Trang 559-575 - 2020
Photodegradation of natural rubber (NR) latex produced low molecular weight liquid natural rubber (LNR). During the photodegradation, organic materials particularly surfactants and non-rubbers also decomposed. The decomposition of surfactants and non-rubbers could influence the stability of the latex. Anionic and non-ionic surfactants were used to stabilize NR latex during the photodegradation. It......
Miscibility of bacterial poly(3-hydroxybutyrate-co-3-hydroxyvalerate) with ester substituted celluloses
Polymer Bulletin - Tập 29 Số 3 - Trang 407-413 - 1992
Blends of bacterial Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) with cellulose acetate butyrate (CAB) and cellulose acetate propionate (CAP) were prepared by melt blending. When CAB or CAP content in the blends is ≥ 50%, the blends are stable, homogeneous mixed glasses, characterized by a glass transition that follows the Fox equation. When the cellulose ester content is lower than 50%, PHBV crys......
Chitosan/calcium phosphate-nanoflakes-based biomaterial: a potential hemostatic wound dressing material
Polymer Bulletin - Tập 80 - Trang 5071-5086 - 2022
The present study describes the synthesis of the calcium phosphate nanoflakes (CaP-NFs) dispersed chitosan (CCP) hemostatic dressing materials. The surface morphology of the CCP-based hemostatic dressing materials was rough and porous, which aided advantages in controlling blood loss. The positively charged CCP-based hemostatic dressing materials lead to strong blood cell adhesion. The efficiency ......
Synthesis of star-shaped poly(vinyl ether)s by living cationic polymerization: Pathway for formation of star-shaped polymers via polymer linking reactions
Polymer Bulletin - Tập 44 - Trang 485-492 - 2000
Star-shaped polymers of isobutyl vinyl ether (IBVE) with a microgel core of an aliphatic divinyl ether (2) were synthesized in high yield on the basis of the living cationic polymerization with the HCl/ZnCl2 initiating system. GPC analysis demonstrated that linear coupling products ("two-armed" polymers) and three-armed star polymers formed during the early stages of the linking reaction, and tha......
Effect of succinonitrile and nano-hydroxyapatite on ionic conductivity and interfacial stability of polyether-based plasticized nanocomposite polymer electrolytes (PNCSPE)
Polymer Bulletin - Tập 70 - Trang 2531-2545 - 2013
A series of novel plasticized nanocomposite solid polymer electrolytes (PNCSPE) consisting of polyethylene oxide as polymer host, lithium bisoxalatoborate as salt with different weight ratios of succinonitrile and nano-hydroxyapatite was prepared by membrane hot-press technique. The electrical property of PNCSPE was investigated by AC impedance analysis. The migration of lithium ion in the polymer......
Effect of layered silicates and reactive compatibilization on structure and properties of melt-drawn HDPE/PA6 microfibrillar composites
Polymer Bulletin - Tập 73 - Trang 1673-1688 - 2015
Microfibrillar composites (MFCs) of HDPE matrix with PA6 reinforcing fibrils formed in situ by melt drawing were modified by ethylene/glycidyl methacrylate copolymer (PEGMA) and addition of layered silicates using different mixing protocols. The goal was enhancement of adhesion between fibrils and matrix, their reinforcement by clay, and evaluation of the effect of clay on the MFC morphology, espe......
Optical rotation of branched polysaccharides
Polymer Bulletin - Tập 16 - Trang 175-180 - 1986
Correlation between optical activity and conformational behavior is attempted for the series of oligomannosides and pure mannan polysaccharide. Then, the principle of decomposing the contribution to optical rotation into some basic components is extended to the case of branched polymers. It is shown that the derived relationship fits the experimental rotation data gathered for this series. Conclus......
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