Manufacture of Syntactic Foams: Pre-Mold Processing

Islam, Mainul; Kim, Ho Sung

doi:10.1080/10426910601015857

Cited by 17 publications

(37 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…They were found to be of approximately Gaussian distribution as previously shown in reference [2]. Particle densities and bulk densities of the two hollow microsphere groups were also measured using a Beckman Air Comparison Pycnometer (Model 930) and a measuring cylinder (capacity 250 cc) respectively.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Syntactic Foams Consolidated with Starch: Mixing Behaviour for Post-Mould Processing

Islam¹,

Kim²

2007

Advanced Materials and Processing IV

Self Cite

View full text Add to dashboard Cite

Abstract. The mixing required for post-mould gelatinisation of syntactic foams using starch as binder was studied. It was found that starch particles tend to adhere to hollow microspheres during mixing, forming agglomerates. A transition in the buoyancy of microsphere-starch phases was found at a particular volume fraction of starch. The transitional point was close to a volume fraction of starch at which a calculated relative density for a system consisting of multiple starch particles per microsphere was unity. Starch-microsphere inter-distance appears to be an important parameter affecting starch content in an agglomeration.

show abstract

Section: Methodsmentioning

confidence: 99%

“…Bulk density was also measured using a measuring cylinder with a tapping device (300 taps were conducted) and an average of five measurements was found to be 0.85 g/cc. SEM images of starch particles employed are reported elsewhere [2]. The gelatinisation temperature range for starch was measured to be 64-69ºC.…”

Section: Methodsmentioning

confidence: 99%

Syntactic Foams Consolidated with Starch: Mixing Behaviour for Post-Mould Processing

Islam¹,

Kim²

2007

Advanced Materials and Processing IV

Self Cite

View full text Add to dashboard Cite

show abstract

“…They were found to be of approximately Gaussian distribution as previously shown in reference (24). Particle densities and bulk densities of the four hollow microsphere groups were also measured using a Beckman Air Comparison Pycnometer (Model 930) and a measuring cylinder (capacity 250cc) respectively.…”

Section: Hollow Microspheresmentioning

confidence: 99%

“…Bulk density was also measured using a measuring cylinder with a tapping device (300 taps were conducted) and an average of five measurements was found to be 0.85g/cc. SEM images of starch particles employed was shown elsewhere (24). Size of starch particles was measured using a Malvern 2600C laser particle size analyser and was found to be of approximately Gaussian distribution as shown in Figure 1.…”

Section: Starch As Bindermentioning

confidence: 99%

“…The consolidating techniques include coating microspheres (10), rotational molding (11), extrusion (12) and ones that use inorganic binder solution and firing (14), dry resin powder for sintering (15)(16)(17)(18), compaction (19,20), liquid resin as binder (21) for in situ reaction injection molding, and buoyancy principle (1,(22)(23)(24)(25)(26). The last method (buoyancy) has recently been demonstrated to be capable of control of a wide range of binder contents at low costs, widening applicability of syntactic foams.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Manufacture of Syntactic Foams Using Starch as Binder: Post-Mold Processing

Islam

Kim

2008

Materials and Manufacturing Processes

Self Cite

View full text Add to dashboard Cite

Syntactic foam manufacturing method, 'post-mold processing', based on the buoyancy of hollow microspheres was studied for potential building material applications. The post-mold processing involves mixing starch particles and ceramic hollow microspheres in water. It was found starch particles tend to adhere to hollow microspheres, forming agglomerations, during mixing. It was also found that 'volume fraction of starch particles on a microsphere making a relative density of 1.0' (VFSMRD) is an indicator for mixture volume transitions. Both the maximum total volume expansion of mixture and a transition in formation, after phase separation, of mixture volume in water referred to as 'top phase' in a mixing container were taken place at a calculated VFSMRD.It was found that hollow microsphere size effect on attracting starch particles was relatively high but IBVMS effect was not significant. Also, no effect of water volume for a given diameter of cylindrical container was found. Starch-microsphere inter-distance was discussed and considered 1 Corresponding author 2 to be an important parameter affecting starch content in an agglomeration. A Simple Cubic cell model for the starch-microsphere inter-distance was adopted to quantitatively explain various effects on starch content in agglomeration such as hollow microsphere size, initial bulk volume of hollow microspheres (IBVMS) and water volume. Further, the following were found for manufactured syntactic foams: (a) volume fraction of starch in foam is of linear relation with starch content before mixing for a given experimental data range and (b) shrinkage is relatively high for small hollow microspheres with high starch content.

show abstract

Rheokinetic studies and compressive response of high performance polybenzoxazine syntactic foams

Ullas

Sharma

Kumar

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polybenzoxazines are finding increasing usage in demanding applications where high temperature stability is required, especially in the field of aerospace. In this work, thermally stable bisphenol F-based polybenzoxazine [poly(BF-a)] syntactic foams containing varying volume fractions (30-60%) of hollow glass microballoons (HGMs) were prepared and their mechanical response in the quasistatic regime was established. The effect of introducing glass microballoons on the curing profile of benzoxazine resin was studied using both nonisothermal differential scanning calorimetry and rheometry. Temperature-sweep experiments were performed to arrive at the optimal processing window of the benzoxazine-glass microballoons formulations, particularly in terms of viscosity, gelation temperature, and time. Thermally accelerated ring-opening polymerization of the benzoxazine resin led to complete curing of the syntactic foam formulations, as assessed by calorimetric studies. The thermal degradation behavior of the poly(BF-a)/HGM was studied using thermogravimetric analysis. As expected, the density of the syntactic foam specimens decreased with increasing microballoon content. Maximal increase in the specific compressive properties of the poly(BF-a)/HGM samples was observed in formulations containing 40% volume fraction of glass microballoons.

show abstract

Manufacture of Syntactic Foams: Pre-Mold Processing

Cited by 17 publications

References 16 publications

Syntactic Foams Consolidated with Starch: Mixing Behaviour for Post-Mould Processing

Syntactic Foams Consolidated with Starch: Mixing Behaviour for Post-Mould Processing

Manufacture of Syntactic Foams Using Starch as Binder: Post-Mold Processing

Rheokinetic studies and compressive response of high performance polybenzoxazine syntactic foams

Contact Info

Product

Resources

About