Juniper Publishers Journal of Polymer science

  Abstract Significant research and developments are taking place in the field of synthetic polyamides (Nylons). One of the most investigated members of this family of polymers is poly (ε-caprolactam) (PCL, Polyamide 6, PA6, Nylon 6). Herein, a brief overview will be presented on the major recent advancements in the anionic ringopening polymerization (AROP) of ε-caprolactam (CL) by the initiating combinations of metal lactamates and carbamoyl caprolactams and by some other initiating systems, e.g. protected N-heterocyclic carbenes , NaHMDI and σ-borane-barium complexes. The in situ polymerization of CL in the presence of additives, such as flame retardants, reinforcing agents and fillers, is also discussed. Examples are presented on the determination of the molecular weight distributions (MWD) and average molecular weights of Polyamide 6 by GPC (SEC) measurements with 1,1,1-trifluoroethanol as eluent used routinely in our laboratories. Finally, a glimpse will be provided into the o...

                                                                                           JUNIPER PUBLISHERS-   ACADEMIC JOURNAL OF POLYMER SCIENCE Abstract Deep Eutectic Solvents (DESs), a subclass of ionic liquids, have emerged as sustainable and green solvents in chemical reactions. In this mini-review article, deep eutectic solvents utilization in the polymer synthesis will be discussed briefly. Keywords: Deep eutectic solvents; Polymer synthesis; Green chemistry Abbrevations: DES: Deep Eutectic Solvents; HBA: Hydrogen Bond Acceptor; HBD: Hydrogen Bond Donor; PDCs: Poly Diol-Co-Citrates; PAAc: Poly (Acrylic Acid); PMAAc: Poly Methacrylic Acid; APS: Ammonium Persulfate; EM: Eutectic Mixture; FP: Frontal polymerization  ...

JUNIPER PUBLISHERS- ACADEMIC JOURNAL OF POLYMER SCIENCE Abstract Thermoplastic copolyesters (TPE-Es) are multi-block copolymers commonly incorporating hard (polyester) and soft (polyether) blocks. Multifunctional epoxy-based chain extenders (TGDDM) are one of the additives that serve to reverse molecular weight (M W ) damage caused by the process of hydrolysis of TPE-E. There are two functional groups that are capable of additional reactions on the terminal hydroxyl and carboxyl groups of TPE-E. Considering the hydrogen bonded hard segments in hard domains are less susceptible to hydrolysis compared to the non-hydrogen bonded equivalents, the phase separated morphology of polyether-polyester copolymers based TGDDM also provides to the long-term stability. The molecular weight of TPE-E was determined by GPC and the thermal and tensile behaviors were investigated. Keywords: Thermoplastic copolyester; Crosslinking; Hydrolysis; Mechanical properties Abbrevations: ...