The effect of side chains on the reactive rate and surface wettability of pentablock copolymers by ATRP

Abstract

The reactive rate and surface wettability of three pentablock copolymers PDMS-b-(PMMA-b-PR) 2 (R 5 3FMA, 12FMA, and MPS) obtained via ATRP for coatings are discussed. Poly(dimethylsiloxane) (PDMS) is used as difunctional macroinitiator, poly(methyl methacrylate) (PMMA) as the middle block, while poly(trifluoroethyl methacrylate) (P3FMA), poly(dodecafluoroheptyl methacrylate) (P12FMA) and poly(3-(trimethoxysilyl)propyl methacrylate) (PMPS) as the end block, respectively. Their reactive rates obtained by gas chromatography (GC) analysis indicate that 3FMA gains 8.053 3 10 25 s 21 reactive rate and 75% conversion, higher than 12FMA (4.417 3 10 25 s 21 , 35%), but MPS has 1.9389 3 10 24 s 21 reactive rate and 96% conversion. The wettability of pentablock copolymer films is characterized by water contact angles (WCA) and hexadecane contact angles (HCA). The PDMS-b-(PMMA-b-P12FMA) 2 film behaves much higher advancing and receding WAC (120 and 116 ) and HCA (60 and 56 ) than PDMS-b-(PMMA-b-P3FMA) 2 film (110 and 106 for WAC, 38 and 32 for HAC) because of its fluorine-rich surface (20.9 wt % F). However, PDMS-b-(PMMA-b-PMPS) 2 film obtains 8 hysteretic contact angle in WAC (114 -106 ) and HAC (32 -24 ) due to its higher surface roughness (138 nm). Therefore, the fluorine-rich and higher roughness surface could produce the lower water and oil wettability, but silicon-rich surface will produce lower water wettability.

Preparation, Structure, and Properties of Silk Fabric Grafted with 2-Hydroxypropyl Methacrylate Using the HRP Biocatalyzed ATRP Method

“…The XPS C1s spectra of silk fabric are shown in Figure 3 . The C1s spectrum of the control silk fabric contains three distinct peaks at 284.5 (C–C), 286.0 (C–OH/C–N), and 288.1 eV (N–C=O) [ 22 ], while the C1s spectrum of HC-silk-g-PHPMA contains three distinct peaks at 284.5 (C–C), 286.3 (C–OH), and 288.6 eV (O–C=O). The C–OH (286.3 eV) and O–C=O (288.6 eV) mainly originated from the hydroxyl and ether of HPMA.…”

Toward Hybrid Materials: Group Transfer Polymerization of 3‐(Trimethoxysilyl)propyl Methacrylate

“…In 2008, TMSPMA was polymerized using 1,2‐bis(bromoisobutyryloxy)ethane as an initiator and a homopolymer with a M w / M n = 1.13 was produced, which was then used as a precursor for the formation of an ABA triblock with a M w / M n = 1.34 . Later on, more triblock as well as pentablock copolymers containing TMSPMA were synthesized by ATRP with D s ranging from 1.16 to 1.46.…”