A novel method of making PVF porous foam without using the pore forming agent

Chang, Yu‐Wei; Cheng, Wei-You; Jang, Larry K.

doi:10.1002/app.41270

Cited by 30 publications

(10 citation statements)

References 15 publications

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“…Figure shows that the pore size increases with increasing formaldehyde dosage. Chang reported that decreasing the PVA reactant solid contents is a major cause of pore size increase . The effect of formaldehyde dosage on PVF foam pore sizes prepared using PVA‐0588 is the opposite of that using PVA‐1799.…”

Section: Resultsmentioning

confidence: 99%

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Porous poly(vinyl formal) foam prepared using poly(vinyl alcohol) of low degree of polymerization

Deng

Zhang

2018

Polymer International

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Poly(vinyl formal) (PVF) foams are usually prepared using poly(vinyl alcohol) (PVA) of high degree of polymerization, the most reported degree of polymerization being 1700. In the work reported, PVA of low degree of polymerization of 500 was used to prepare PVF foams, which is a great challenge because of the weaker hydrogen bond interaction than that for a higher degree of polymerization. By changing the concentration (from 10 to 20 wt%) of PVA solution, PVF foams were successfully obtained. It was found that a higher PVA concentration prevented foam volume shrinkage and the best concentration was 16 wt%. Scanning electron microscopy showed that the PVF foams had two kinds of pore structures, closed and open cell. The water absorption capacity and thermal properties of the PVF foams were carefully investigated. RESULTS AND DISCUSSION Effect of PVA concentration on PVF foamsGenerally, it is difficult to produce PVF foam using PVA of low degree of polymerization due to significant volume shrinkage probably because of weaker hydrogen bond interaction than that for PVA of higher degree of polymerization, as shown in Fig. 1. Low hydrogen bondsLow concentration High hydrogen bonds High concentration Figure 1. Effect of PVA concentration on formation of PVF foam.

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Section: Resultsmentioning

confidence: 99%

“…Because of hydroxyl activity, PVA with a high degree of polymerization is easier to react with aldehydes. The high acetal products obtained with formaldehyde are usually poly(vinyl formal) (PVF) foams with open‐cell structure . By introducing different foaming methods, PVF with different pore sizes (more than 20 µm) can be prepared .…”

Section: Introductionmentioning

confidence: 99%

Porous poly(vinyl formal) foam prepared using poly(vinyl alcohol) of low degree of polymerization

Deng

Zhang

2018

Polymer International

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“…Commercial polyvinyl alcohol (BF-17) with averaged polymerization degree of 1700 and hydrolysis degree of 98.5-99.2 mol % were obtained from Chang-Chun Petrochemical Co., Ltd, Taiwan [8].…”

Section: Experimental Materialsmentioning

confidence: 99%

“…Polyvinyl alcohol foam (PVAF) is synthesized with polyvinyl alcohol (PVA) and formaldehyde [8][9][10][11][12][13][14]. A novel polyvinyl alcohol foam (PVAF) with fully open cells and channels was designed by using a super clean bioimmic airfoaming process [8][9][10][11][12][13][14].…”

Section: Preparation Of Polyvinyl Alcohol Foam (Pvaf) By Using Two Traditional Foaming Process and A Super Clean Bioimmic Air-foaming Promentioning

confidence: 99%

“…Selections of suitable materials for biomedical and clinical applications such as polyvinyl alcohol, polyelectrolyte, polycarboxybetaine, polysulfobetaine, polyurethane, polynorbornene, polyester, polymethacrylate, natural polymer, and polymeric resins could be substantially considered and further employed [1][2][3][4][5][6]. The surface modification could be considered to change the surface characteristic and microenvironment of materials for specific clinical demands [7][8]. High permeability of protecting medical matrix such as polyurethane matrix or non-woven matrix could be employed for the clinical application of masks.…”

Section: Introductionmentioning

confidence: 99%

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Creative Contributions of the Methods of a Biomimetic Inventive Design of Novel Medical Drainage Materials Derived From Polyvinyl Alcohol Foam with Air Cavities Bioinspired by Avian Skeleton and Feather Rachises

Huang¹

2022

AABSc

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Traditional drainage materials used in a surgical treatment or in wound management are not good enough in both the effectiveness and efficiency because they may cause infection due to their characteristics. Therefore, a novel drainage material should be essential and designed to solve the problem. Avian skeleton and feather rachises may be good reference objects to mimic in designing a novel drainage material because its good cell structure which support a bird to fly safe and efficient. The term “nature-Bioinspired” is associated with a sequence of efforts to understand, synthesize and imitate any natural object or phenomenon either in a tangible or intangible form, which allows us to obtain improved insights into nature. Such inspirations can come through materials, processes, or designs. In this study, a new medical matrix derived from polyvinyl alcohol foam with air cavities inspired by avian skeleton and feather rachises for drainage medical treatments was designed, prepared, and characterized. Establishment of biomimetic biomedical inventive principles and a bio-inspired design-thinking method for innovative design of biomimetic medical devices and biomaterials were achieved. Also, the medical device (MD) unified problem-driven bioinspired evaluating approach was established to guide biomimetic design of biomaterials and the corresponding medical devices for various clinic applications.

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Morphological control of porous membranes based on aromatic polyether/water soluble polymers

Karamessini

Lainioti

Deimede

et al. 2016

J of Applied Polymer Sci

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This work describes the development of porous membranes based on blends of an aromatic polyether bearing main and side chain pyridine units (AP) with hydrophilic ionic polymers, like poly(sodium 4-styrenesulfonate) (PSSNa) and its acid form (PSSH), or non-ionic like polyvinylpyrrolidone and polyethylene glycol. Porous membranes were obtained after the removal of the water soluble polymers from the respective blend. The effect of various parameters such as water soluble polymer used (pore former), blend composition, casting solvent, and solvent evaporation level on porous structure formation was studied thoroughly. Specifically, SEM examination for the aforementioned systems indicated various porous morphologies depending on experimental conditions as well as thermodynamic and kinetic parameters occurring during their formation. The thermal properties of the membranes were influenced by the kind of the pore former, as revealed by thermogravimetric analysis. Special attention was paid to the systems AP/ PSSNa and AP/PSSH to evaluate their miscibility via dynamic mechanical analysis and ATR-FTIR spectroscopy. AP/PSSNa membranes have been preliminary used to test the water permeability for water purification. The tests revealed high water flux values at increased PSSNa concentrations.

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A novel method of making PVF porous foam without using the pore forming agent

Cited by 30 publications

References 15 publications

Porous poly(vinyl formal) foam prepared using poly(vinyl alcohol) of low degree of polymerization

Porous poly(vinyl formal) foam prepared using poly(vinyl alcohol) of low degree of polymerization

Creative Contributions of the Methods of a Biomimetic Inventive Design of Novel Medical Drainage Materials Derived From Polyvinyl Alcohol Foam with Air Cavities Bioinspired by Avian Skeleton and Feather Rachises

Morphological control of porous membranes based on aromatic polyether/water soluble polymers

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