title: Silane crosslinking of electrospun poly (lactic acid)/nanocrystalline cellulose bionanocomposite.
abstract: Biodegradable nanofibrous mats fabricated by electrospinning are commonly used in tissue engineering, however, lack of essential mechanical properties of such nanofibers is a challenging issue. In this work, vinyltrimethoxysilane (VTMS) was grafted onto poly (lactic acid) (PLA) and the silane grafted PLA was subsequently applied in electrospinning process. Electrospun nanofibrous mats based on PLA/nanocrystalline cellulose (NCC) and PLA-g-silane/NCC nanocomposites were fabricated and immersed in hot water (70°C) for crosslinking of silane grafted PLA. It was found that introducing NCC to the samples cause to reduction in fiber diameter and the other hand the silane crosslinking of PLA increase the mean fiber diameter. DSC thermograms also revealed that silane grafting caused a reduction in mobility of polymer segments, and consequently reduction of crystallinity. On the contrary, the NCC in the PLA-g-silane samples effectively influenced the crystal nucleation, while in the PLA nanofibers the nucleation was lower. The impact of NCC on tensile strength enhancement of samples was notable. The results suggested that the chemical crosslinking remarkably improves the mechanical properties of PLA nanofibers. Furthermore, biocompatibility of such modified nanofibers was also evaluated through cytotoxicity results, therefore the modified PLA nanocomposite can be considered as a practical candidate for hard tissue engineering applications.
authors: Department of Plastics, Iran Polymer and Petrochemical Institute, P.O. Box: 14965/115, Tehran, Iran.
authors: M
authors: M
authors: Rahmat
authors: Department of Rubber, Iran Polymer and Petrochemical Institute, Nano and Smart Polymers Center of Excellence, P.O. Box: 14965/115, Tehran, Iran. Electronic address: M.karabi@ippi.ac.ir.
authors: M
authors: M
authors: Karrabi
authors: Department of Plastics, Iran Polymer and Petrochemical Institute, P.O. Box: 14965/115, Tehran, Iran.
authors: I
authors: I
authors: Ghasemi
authors: Department of Biomaterial, Iran Polymer and Petrochemical Institute, P.O. Box: 14965/115, Tehran, Iran.
authors: M
authors: M
authors: Zandi
authors: Department of Plastics, Iran Polymer and Petrochemical Institute, P.O. Box: 14965/115, Tehran, Iran.
authors: H
authors: H
authors: Azizi
mesh_terms: D000818:Animals; D002460:Cell Line; D002482:Cellulose / Q000737:chemistry / Q000494:pharmacology; D003432:Cross-Linking Reagents / Q000737:chemistry*; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism*; D051379:Mice; D053761:Nanocomposites / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry / Q000494:pharmacology; D012821:Silanes / Q000737:chemistry*
chemical_list: D003432:Cross-Linking Reagents; D011091:Polyesters; D012821:Silanes; C033616:poly(lactide); D002482:Cellulose
keywords: Biocomposites; Cellulose nanocrystals; Electrospinning; Poly (lactic acid); Silane crosslinking; Tissue engineering