A facile preparation of epoxy-polydimethylsiloxane (EP-PDMS) polymer coatings for marine applications
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A facile preparation of epoxy-polydimethylsiloxane (EP-PDMS) polymer coatings for marine applications Shatakshi Verma1,a), Sonalee Das2, Smita Mohanty3, Sanjay Kumar Nayak3 1
Department of Plastic Technology, Central Institute of Plastics Engineering and Technology (CIPET), Chennai, Tamil Nadu 600 032, India Research and Development, Laboratory for Advanced Research in Polymeric Materials (LARPM), Bhubaneswar, Odisha 751024, India 3 Department of Plastic Technology, Central Institute of Plastics Engineering and Technology (CIPET), Chennai, Tamil Nadu 600 032, India; and Research and Development, Laboratory for Advanced Research in Polymeric Materials (LARPM), Bhubaneswar, Odisha 751024, India a) Address all correspondence to this author. e-mail: [email protected] 2
Received: 16 January 2019; accepted: 2 July 2019
Chemically modified polymer coatings have been synthesized using a blend of soft polymeric material polydimethylsiloxane (h-PDMS) incorporated with stiff polymer epoxy resin (EP) and was cross-linked using silane compatibilizer 3-aminopropyltriethoxysilane (APTES). A comparative analysis has been carried out between neat epoxy coating (N-EP) and epoxy–hydroxy-terminated polydimethylsiloxane (EP-hPD) blends to study the influence of blending ratio on various properties to cater marine applications. An increase of 144.4% in the Young’s modulus (E) and 37.5% increment in adhesion strength at 30 wt% h-PDMS content was observed as compared with N-EP. The water contact angle results demonstrated a substantial increase in contact angle from 52.3° to 90.1° at 30 wt% h-PDMS content as compared to N-EP. Taber abrasion results revealed a decrease in weight loss (mg/1000 cycles) by 24.1 and 17.7% at 10 and 30 wt% loading of h-PDMS in comparison to N-EP. The surface roughness of N-EP and 30 wt% EP-hPD blend were found to be 33.4 nm and 41.4 nm, respectively. To determine the applicability of the developed blend coatings obligatory tests such as field immersion study and chemical resistance evaluation were conducted, and optimum performance was manifested by EP-hPD blend at an EP:h-PDMS ratio of 70:30.
Introduction Recent trends have witnessed attention toward the development of robust marine coatings with outstanding mechanical properties, excellent adhesion to the substrates, good drag resistance to hydrodynamic force, and barrier properties [1, 2, 3]. With the ban of tributyltin (TBT)-based coatings by the International Maritime Organization (IMO) [4, 5], scientists and researchers have focused toward eco-friendly marine coatings. Among the various resins, polydimethylsiloxane (PDMS) has become one of the explored binder materials for the synthesis of antifouling marine coatings [6]. The tremendous interests behind using PDMS are its excellent chemical stability, non-toxicity, outstanding flexibility, and lower surface energy [7, 8, 9]. However, the main limitation of PDMS is its poor-adhesion to substrate and lower mechanical properties, which limits its application in the field of functional marine coating
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