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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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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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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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Biosourced All-Acrylic ABA Block Copolymers with Lactic Acid-Based Soft Phase.

Nabil Bensabeh1, Ana Jiménez-Alesanco2, Ilme Liblikas3

  • 1Laboratory of Sustainable Polymers, Department of Analytical Chemistry and Organic Chemistry, University Rovira i Virgili, 43007 Tarragona, Spain.

Molecules (Basel, Switzerland)
|December 9, 2020
PubMed
Summary

This study introduces sustainable, biobased all-acrylic ABA copolymers using poly(butyl lactate acrylate) as a rubbery middle block. These materials show promising performance comparable to commercial pressure-sensitive tapes.

Keywords:
PSARAFTalkyl lactateblock copolymersrenewable resources

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Area of Science:

  • Polymer Chemistry
  • Sustainable Materials Science
  • Biobased Chemicals

Background:

  • Lactic acid is a versatile biobased building block derived from sugars.
  • Developing sustainable polymers from biobased monomers is crucial for reducing reliance on petrochemicals.

Purpose of the Study:

  • To synthesize well-defined, rubbery polymers from butyl lactate acrylate via RAFT polymerization.
  • To create sustainable all-acrylic ABA copolymers using these biobased polymers as middle blocks.
  • To evaluate the thermal, morphological, and mechanical properties of these novel copolymers.

Main Methods:

  • Reversible Addition-Fragmentation chain Transfer (RAFT) polymerization of butyl lactate acrylate.
  • Synthesis of ABA copolymers with poly(butyl lactate acrylate) as the soft segment and glassy polyacrylates as hard segments.
  • Characterization of copolymer properties including thermal stability, glass transition temperature (Tg), morphology, and mechanical performance (e.g., peel adhesion).

Main Results:

  • Successfully prepared poly(butyl lactate acrylate) with controlled molecular weight and narrow molecular weight distribution.
  • Synthesized ABA copolymers exhibiting a low Tg (-20 °C) for the poly(butyl lactate acrylate) block, good thermal stability, and low toxicity.
  • Demonstrated that copolymers with <20 wt% hard segments possess suitable properties for functional materials, with peel adhesion comparable to commercial tapes.

Conclusions:

  • Rubbery poly(alkyl lactate)s are effective sustainable building blocks for developing functional all-acrylic ABA copolymers.
  • The synthesized biosourced copolymers offer competitive performance for applications like pressure-sensitive tapes.
  • This work highlights the potential of lactic acid derivatives in creating advanced, eco-friendly materials.