Crab and prawn shell utilization as a source of bio-based thermoplastics through graft polymerization with acrylate monomers
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To recycle crab and prawn shell wastes and prepare environment friendly thermoplastics, various acrylate monomers—methyl (meth)acrylates, ethyl (meth)acrylates, and butyl (meth)acrylates were grafted onto molecular chains of chitin and crude protein in shells. The acrylates were proved to be successfully grafted onto the demineralized shells through FTIR characterization and grafting parameters of the shell-g-polyacrylates were obtained through titration and Soxhlet extraction. Then, effects of grafting ratio and molecular structure of acrylate monomers on tensile properties and water resistance of the grafted shell thermoplastic films were surveyed. With the increase in grafting ratio of the demineralized shell-g-PMMA, tensile strength of the thermoplastic films initially increased, reached the maximum when the ratio was 31.86%, and then leveled off while both the elongation and water resistance of the film showed an increasing trend. In addition, with the increase in the alkyl chain length of ester group in acrylate unit, tensile strength and water resistance of the grafted shell film decreased continuously while tensile elongation kept increasing. As for α-methyl in methacrylate unit, the film prepared from the shells grafted with methacrylates had higher tensile strength and water resistance but lower elongation than the ones grafted with corresponding acrylates.
KeywordsCrab and prawn shells Thermoplastics Graft polymerization Acrylates Molecular structure
The work was supported financially by Technological Research Project for Public Welfare of Zhejiang Province [No. 2016C34009; No. 2017C34009] and Scientific Research Program of Zhejiang Province Department of Education [No. Y201533919]. Financial sponsors do not endorse the views expressed in this publication.
- 3.Jin EQ, Li ML, Zhang LY (2014) Effect of polymerization conditions on grafting of methyl methacrylate onto feather keratin for thermoplastic applications. J Polym Mater 31:169–183Google Scholar
- 4.Shi J (2011) Studies on shrimp and crab shell waste of the resource utilization. Dissertation, Hainan UniversityGoogle Scholar
- 6.Draczynski Z, Bogun M, Rabiej S, Mikolajczyk T, Szparaga G, Krol P (2013) New generation butyric-acetate copolymer of chitin (BOC) fibres with ceramic HAp and TCP nanoadditives for the manufacture of fibrous composite materials. Fiber Polym 14:1107–1117. doi: 10.1007/s12221-013-1107-2 CrossRefGoogle Scholar
- 8.Imtiaz T, Lee KK, Munro CA, MacCallum DM, Shankland GS, Johnson EM, MacGregor MS, Bal AM (2012) Echinocandin resistance due to simultaneous FKS mutation and increased cell wall chitin in a Candida albicans bloodstream isolate following brief exposure to caspofungin. J Med Microbiol 61:1330–1334. doi: 10.1099/jmm.0.045047-0 CrossRefGoogle Scholar
- 13.Tsukada M, Shiozaki H, Freddi G, Crighton JS (1997) Graft copolymerization of benzyl methacrylate onto wool fibers. J Appl Polym Sci 64:343–350. doi: 10.1002/(SICI)1097-4628(19970411)64:2<343::AID-APP15>3.0.CO;2-1 CrossRefGoogle Scholar
- 17.James EM (1999) Polymer data handbook. Oxford University Press, New York, pp 642–643Google Scholar
- 19.Trimnell D, Fanta GF, Salch JH (1996) Graft polymerization of methyl acrylate onto granular starch: comparison of the Fe2+/H2O2 and ceric initiating systems. J Appl Polym Sci 60:285–292. doi: 10.1002/(SICI)1097-4628(19960418)60:3<285::AID-APP1>3.0.CO;2-H CrossRefGoogle Scholar
- 23.Rubinson KA, Rubinson JF (2003) Contemporary instrumental analysis. Science Press, Beijing, pp 467–468Google Scholar
- 24.Sun YY, Shao ZZ, Zhou L, Yu TY (1998) Compatibilization of acrylic polymer-silk fibroin blend fibers. 1. Graft copolymerization of acrylonitrile onto silk fibroin. J Appl Polym Sci 69:1089–1097. doi: 10.1002/(SICI)1097-4628(19980808)69:6<1089::AID-APP5>3.0.CO;2-C CrossRefGoogle Scholar