Surface Modification of Poly(3-hydroxybutyrate) (PHB) by Photografting and Its Properties Evaluation

Cai, Zengxuan; Cheng, Guangcun; Mingming, Geng; Tang, Zhiyuan

doi:10.1023/b:jpol.0000031065.88526.92

Cited by 18 publications

(8 citation statements)

References 28 publications

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“…It is known for longer time that the UV irradiation generates radicals on the film surface 17 and/or can also initiate HEMA polymerization. We have demonstrated that 20 min of irradiation (native PHBHV film immersed in a monomer solution 5% v/v) didn't occurred grafting of PHEMA onto PHBHV.…”

Section: Resultsmentioning

confidence: 99%

“…Control of the films surface properties, such as wettability, adsorption, chemistry, charge, roughness, and rigidity 10,11 is important when polymeric material is in contact with cells. To trigger the cell-matrix adhesion on polymer surfaces, several surface modification techniques have been recently applied, including alkaline hydrolysis, 12,13 implantation, 14 gamma irradiation, 15 oxygen plasma treatment, 16 UV, 17 or ozone 18 followed by chemical grafting. 19 Surface modification of polymer films offers versatile means for incorporating new functionalities.…”

Section: Introductionmentioning

confidence: 99%

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Surface functionalization of PHBV by HEMA grafting via UV treatment: Comparison with thermal free radical polymerization

Lao

Renard

Langlois

et al. 2009

J of Applied Polymer Sci

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ABSTRACT:The photochemical grafting HEMA onto poly(3-hydroxybutyrate-co-3-hydroxyvalerate) PHBHV films using benzophenone (BP) or H 2 O 2 as initiator was investigated to develop a route of grafting restricted to the surface. The effect of various parameters, such as monomer concentration, initiator, and reaction time, on grafting yield was studied and compared with results obtained when using benzoyl peroxide (BPO) as initiator. The morphology and structure of grafted films were characterized by Fourier Transform Infrared spectroscopy with attenuated reflexion, scanning electron microscope and Energy Dispersive X-ray Analysis. The results show that BP and H 2 O 2 are very efficient for the grafting on the surface PHBV. The process is very fast and easy and the results are reproducible in a wide range. Photoinitiation grafted only on the surface in comparison with BPO, where the grafting is located in all the bulk of film. The films grafted by UV in presence of H 2 O 2 are totally biodegradable when the graft level was low (less than 10%).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface functionalization of PHBV by HEMA grafting via UV treatment: Comparison with thermal free radical polymerization

Lao

Renard

Langlois

et al. 2009

J of Applied Polymer Sci

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“…Thus, the surface modification of these polymers is important for all applications involving their contact with physiological components [69,70]. The influence of the oxygen and nitrogen plasmas on the hydrophilicity of the PLLA and PHBV was studied.…”

Section: Oxygen In Plasma Gas and The Surface Wettability Of Modifiedmentioning

confidence: 99%

Wettability and Other Surface Properties of Modified Polymers

Kasálková¹,

Slepička²,

Kolská³

et al. 2015

Wetting and Wettability

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Surface wettability is one of the crucial characteristics for determining of a material's use in specific application. Determination of wettability is based on the measurement of the material surface contact angle. Contact angle is the main parameter that characterizes the drop shape on the solid surface and is also one of the directly measurable properties of the phase interface. In this chapter, the wettability and its related properties of pristine and modified polymer foils will be described. The wettability depends on surface roughness and chemical composition. Changes of these parameters can adjust the values of contact angle and, therefore, wettability. In the case of pristine polymer materials, their wettability is unsuitable for a wide range of applications (such as tissue engineering, printing, and coating). Polymer surfaces can easily be modified by, e.g., plasma discharge, whereas the bulk properties remain unchanged. This modification leads to oxidation of the treated layer and creation of new chemical groups that mainly contain oxygen. Immediately after plasma treatment, the values of the contact angles of the modified polymer significantly decrease.In the case of a specific polymer, the strongly hydrophilic surface is created and leads to total spreading of the water drop. Wettability is strongly dependent on time from modification.Wettability plays a key role, e.g., in the development of biomaterials in tissue engineering and regenerative medicine. Biocompatibility tests of the cell adhesion, proliferation and viability are performed in an aqueous medium, and it is necessary to control the surface wettability. Various cell types have different requirements on surface properties, but while maintaining suitable parameters, the optimal value of © 2015 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.water contact angle for cell adhesion is in the interval of 50-70°. In the case of polymers, which have usually higher values of contact angles, the decrease in water contact angle and adjustment of the surface may be accomplished by introducing selected chemical groups (by plasma treatment), chemical compounds (by grafting, i.e., chemical bath deposition), or nanoparticles. In the case of grafting of polyethylene glycol (PEG) on the plasma activated high-density polyethylene was under "properly" selected conditions of modification (molecular weight of PEG, concentration of PEG in solution) prepared layers that positively influenced the cell adhesion. In addition, low concentration of gold nanoparticles increased the number of adhered cells without decreasing cell viability.Whether the surface of the polymeric substrate is attractive for the adhesion and proliferation of cells is determined not only by wettability but also by a range of other surface properties...

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“…Due to environmental issues and rising oil prices, researchers from academia and industry have been encouraged to develop biodegradable polymers. Biodegradable polymers have the potential to be biomaterials in medical application [1,2]. Avérous (2004) has classified of biodegradable polymers into four families based on the origin different.…”

Section: Introductionmentioning

confidence: 99%

Crystallization behavior of poly(lactic acid)/elastomer blends

et al. 2012

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Differential Scanning Calorimetry (DSC) was used to evaluate the crystallization behavior of poly(lactic acid) and its blends with elastomer. It has been observed that the cold crystallization temperature of the blends decreased as the weight fraction of elastomer increased as well as the onset temperature of cold crystallization also shifted to lower temperature. In non-isothermal crystallization experiments, the crystallinity of poly(lactic acid) increased with a decrease in the heating and cooling rate. The melt crystallization of poly (lactic acid) appeared in the low cooling rate (1, 5 and 7.5°C/ min). The presence of low elastomer tends also to increase the crystallinity of poly (lactic acid). The DSC thermogram at ramp of 10°C/min showed the maximum crystallinity of poly(lactic acid) is 36.95% with 20 wt% elastomer contents in blends. In isothermal crystallization, the cold crystallization rate increased with increasing crystallization temperature in the blends. The Avrami analysis showed that the cold crystallization was in two stages process and it was clearly seen at low temperature. The Avrami exponent (n) at first stage was varying from 1.59 to 2 which described a one-dimensional crystallization growth with homogeneous nucleation, whereas at second stage was varying from 2.09 to 2.71 which described the transitional mechanism to three dimensional crystallization growth with heterogeneous nucleation mechanism. The equilibrium melting point of poly (lactic acid) was also evaluated at 176°C.

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Surface Modification of Poly(3-hydroxybutyrate) (PHB) by Photografting and Its Properties Evaluation

Cited by 18 publications

References 28 publications

Surface functionalization of PHBV by HEMA grafting via UV treatment: Comparison with thermal free radical polymerization

Surface functionalization of PHBV by HEMA grafting via UV treatment: Comparison with thermal free radical polymerization

Wettability and Other Surface Properties of Modified Polymers

Crystallization behavior of poly(lactic acid)/elastomer blends

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