Bio‐based and Degradable Block Polyester Pressure‐Sensitive Adhesives

Abstract

A new class of bio-based and fully degradable block polyesters are pressure-sensitive adhesives. Bio-based monomers are efficiently polymerized to make block polyesters with controlled compositions. They show moderate to high peel adhesions (4-13 N cm-1), controllable storage and loss moduli and are removed by adhesive failure. Their properties compare favorably with commercial adhesives or bio-based polyester formulations but without need for tackifier or additives.

Polymer Pressure‐Sensitive Adhesive with A Temperature‐Insensitive Loss Factor Operating Under Water and Oil

“…At the debonding frequency, enough moduli (≥1 × 10 3 Pa) were required to resist shear. [18] Temperature-sweep from 0 to 100 °C showed flowing and wetting properties of PMEA-PATU at a bonding frequency of 0.1 Hz, and the PSA exhibited enough moduli above a frequency of 1 Hz (Figure 2H). Base on the suitable rheological properties from 0 to 100 °C, the PMEA-PATU could lift a glass cube in both ice water and boiling water (Figure 2I; Video S1, Supporting Information).…”

“…That depends on the PAS thickness, the contact rate, and the peel rate. [3,18,22] Adhesion stress was also measured at different strain rates (Figure 2G1), and a logarithmic linear change of adhesive stress σ ad from 66±10 to 155±14 kPa with the strain rate from 0.083 to 25.000 s −1 at room temperature is shown in Figure 2G2. 180° peel test also showed the same change of peel force as a function of peel speed, and the peel force is 2.0±0.1 N cm −1 at a standard test rate of 300 mm min −1 (Figure S6, Supporting Information).…”

“…Temperature-insensitive tan δ was uncommon for polymer materials, such as block polyester PSAs, [18] acrylate PSAs, [31] commercial styrene-isoprene-styrene/styreneisoprene PSAs, [32] thermoplastic polyurethane (TPU) PSA, [33] poly(methacrylamide-co-methacrylic acid) (P(Mam-co-PMAc)) gel, [34] Fe 3+ -2,6-pyridinedicarboxamide-poly(dimethylsiloxane) (Fe-Hpdca-PDMS) elastomer, [35] block copolymer doublenetwork (B-DN) gel, [36] polyampholytes (PA) gel, [37] and polyurethane-urea (PPGTD-IDA) elastomer [38] (Figure S9, Supporting Information). Master curves of frequency dependence of the storage modulus G′, loss modulus G′′, and loss factor tan δ of PMEA-PATU by time-temperature superposition shifts at a reference temperature of 20 °C were shown in Figure 3A1.…”

“…[15][16][17] However, the temperature sensitiveness also limits the operating condition of PSA and most of the PSAs were designed to be operated only at room temperature, or limited temperature range. [18,19] For example, some extremely low temperature adhesives work at low temperature but are operated at room temperature or even higher temperature. [19] Antifreezing gels with repeatable adhesion ability over a wide temperature range from −60 to 60 °C were developed by incorporating ethylene glycol.…”

Controllable preparation and performance of bio-based poly(lactic acid-iminodiacetic acid) as sustained-release Pb2+ chelating agent

“…Owing to the irreversibility constraint of the materials from petrochemical resources ( Giraud et al., 2020 ), making use of biomass, the most abundant renewable carbon feedstock in the world ( Liao et al., 2020 ) as an important way to the circular sustainable economy ( Faveere et al., 2020 ) has great potential to replace or even surpass petrochemical feedstocks in most cases ( Wang et al., 2020a , 2020b ). Bio-based materials derived from biomass have been proved to be applicable to vaccine carriers ( Fruk et al., 2021 ), electronic products ( Maiti et al., 2019 ), industrial products ( Hu et al., 2020 ), daily necessities ( Chen et al., 2020 ), fuels ( Sherkhanov et al., 2020 ), and many other fields ( Byun and Han, 2020 ). Among them, polylactic acid (PLA), as the most widely used bio-based polymer ( Hermann et al., 2020 ), has been recognized by the US Food and Drug Administration because of its good biocompatibility ( Massoumi et al., 2020 ; Shin et al., 2019 ) and biodegradability ( Luo et al., 2017 ; He et al., 2019a , 2019b ).…”