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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Characteristics and Nomenclature of Homopolymers01:00

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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Nonisocyanate Polyurethane Segmented Copolymers from Bis-Carbonylimidazolides.

Jose I Sintas1, Ren H Bean1, Rui Zhang2

  • 1School of Molecular Sciences & Biodesign Center for Sustainable Macromolecular Materials and Manufacturing (SM3), Arizona State University, Tempe, AZ, 85287, USA.

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Bis-carbonylimidazolide (BCI) functionalization provides an efficient route to high molecular weight segmented nonisocyanate polyurethanes (NIPUs). This study demonstrates nanophase separation in BCI-derived NIPUs, comparable to traditional polyurethanes.

Keywords:
engineering polymersgreen chemistrynonisocyanatesustainabilitythermoplastic polyurethane

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Traditional polyurethanes (PUs) synthesis relies on hazardous isocyanates.
  • Nonisocyanate polyurethanes (NIPUs) offer a safer alternative but require efficient synthetic strategies.
  • Developing high molecular weight segmented NIPUs with controlled properties is crucial for advanced applications.

Purpose of the Study:

  • To demonstrate the feasibility of using Bis-carbonylimidazolide (BCI) functionalization for synthesizing high molecular weight segmented NIPUs.
  • To investigate the effect of hard segment concentration on the phase behavior and morphology of BCI-derived NIPUs.
  • To compare the nanophase separation in BCI-derived NIPUs with conventional isocyanate-based PUs.

Main Methods:

  • Melt phase polymerization utilizing ED-2003 Jeffamine, 4,4'-methylenebis(cyclohexylamine), and a BCI monomer.
  • Dynamic Mechanical Analysis (DMA) and Differential Scanning Calorimetry (DSC) for thermal transition analysis.
  • Atomic Force Microscopy (AFM) and Small-Angle X-ray Scattering (SAXS) for morphological and nanophase separation characterization.

Main Results:

  • Segmented polyether NIPUs with 40-80 wt.% hard segments were successfully synthesized.
  • DMA and DSC revealed distinct thermal transitions (Tg, Tm) corresponding to soft, hard, and mixed phases.
  • AFM and SAXS confirmed nanophase separation, with nanoscale rod-like hard segment assemblies observed.
  • Phase separation in BCI-derived NIPUs was found to be comparable to isocyanate-derived analogues.

Conclusions:

  • BCI functionalization is an effective nonisocyanate pathway for producing high molecular weight segmented NIPUs.
  • The synthesized NIPUs exhibit controlled nanophase separation, crucial for tailoring material properties.
  • This approach offers a promising route for developing safer, high-performance polyurethane materials.