Comparative performance of linear, cross-linked, and plasma-deposited PMMA capacitive humidity sensors

Ralston, A.R.K.; Tobin, Jeffrey A.; Bajikar, Sateesh S.; Denton, Denice D.

doi:10.1016/0925-4005(94)87013-6

Cited by 38 publications

(31 citation statements)

References 16 publications

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“…PMMA with diamine compounds can be produced by condensation reactions among the carbonyl group (>C=O) with Amine group (-NH), These reactions may be used for to improve PMMA properties mainly thermal steadiness and texture behavior by means of normal chemical action by the use of aliphatic and aromatic diamines in several ratios as cross-linking agents as shown in Figure 2 [12]. [12] Tensile strength Increase [13] surface hardness Increase [14] Mechanical stability Greatly improved [15] flame retardant Increase [16] Elasticity slightly increase [17] solvent resistance Increase [10] chemical resistance Increase [14] Small-molecule cross-linking Some Small-molecules considered as a cross-linker and used potentially to obtain cross-linked polymer such as: formaldehyde, glutaraldehyde, potassium dichromate, osmium tetroxide, and potassium permanganate, other than the multifunctional (bi, tri, or tetra) cross-linking agent [20,21]. This technique is used mostly for the polymers containing, carboxylic acid, hydroxyl and amine grounded functionality, and it is used extensively like addition or condensation polymerization by free radical polymerization polystyrene (PS) and PMMA amide functionalized were produced.…”

Section: Cross-linking Through Condensation Reactionsmentioning

confidence: 99%

“…In most cases, chemical modifications enhance the total performance of PMMA and lead to unexpected new type of application that can be utilized for the new products. Table 1 summarize the most promoted characterizations after crosslinking occurs [10,[12][13][14][15][16][17].…”

Section: The Cross-linking Effect On Various Characteristicsmentioning

confidence: 99%

“…Unfortunately, the hydrophobic nature and lack of triggered organic groups on PMMA, its low mechanical -dynamical properties under high temperature circumstances and thermal steadiness considered as drawbacks of PMMA that restricted its applications. There is an important well known method used to improve the properties of PMMA radically such as: its influence in the chemical, thermal, physical, morphological, and mechanical behavior of a polymer, which made it used potentially in different fields such as electronic applications [9], humidity sensors [10] batteries [11]. This method is called Cross-linking in which it tends to polymer modification by the process of interlinking the polymer chains through ionic or covalent bonds, in which it confines the polymer chains to slide past each other by impeding their free movement and produces elasticity in amorphous polymers at the same time, and this process can be carried out by using (i) chemical cross-linking or (ii) physical procedures.…”

Section: Introductionmentioning

confidence: 99%

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Role of Cross-Linking Process on the Performance of PMMA

Albeladi¹,

Al-Romaizan²,

Hussein³

2017

IJBSBE

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In order to encounter the necessities of the application, cross-linking of poly(methyl methacrylate) (PMMA) has been emerged and become an interesting issue, due to the unsatisfied results that result by the neat poly(methyl methacrylate) itself. Numerous facets make cross-linked PMMA superior and preferred than uncross polymer like the enhanced heat performance, the outstanding mechanical properties, its chemical resistance and good abrasion resistance. UV radiation, Cross-linking by free radical, small-molecule cross-linking, and condensation are discoursed concisely in the following review, also the effects of cross-linker on polymer properties are discussed. Importantly, present the review discusses the different important applications of cross-linked PMMA.

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Section: Cross-linking Through Condensation Reactionsmentioning

confidence: 99%

Section: The Cross-linking Effect On Various Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Role of Cross-Linking Process on the Performance of PMMA

Albeladi¹,

Al-Romaizan²,

Hussein³

2017

IJBSBE

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“…This type of behavior has been observed for poly(pyrrole) conducting polymer vapor sensors, 38 and for vapor sensors that monitor the capacitance change of dielectric polymer films in response to the presence of vapor analytes, where again the response is a linear function of the analyte concentration. 39 " 41 Polymer films that are exposed to analytes that either bind very strongly to the polymer, or that induce significant structural distortions in the chains of the polymeric material, could certainly produce a saturation of the detector response at concentrations well below the saturated vapor pressure of the analyte; however, such behavior was not observed for any of the solvents or detectors explored in this work.…”

Section: Linearity Of Detector Response Vs Analyte Concentrationmentioning

confidence: 42%

A Conducting Polymer-Based Electronic Nose for Landmine Detection

Lewis¹,

Goodman²,

Grubbs³

2001

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collectior of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT DATE (DD-MM-YYYY) SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Sponsor: Defense Advanced Research Projects Agency (DARPA) Advanced Technology Office (Regina Dugan) 3701 North Fairfax Drive Arlington, VA 22203-1714 SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S)NATICK/TR-02/002 DISTRIBUTION/AVAILABILITY STATEMENTApproved for Public Release; Distribution Unlimited SUPPLEMENTARY NOTESMonitor: US Army Soldier and Biological Chemical Command, Soldier Systems Center, ATTN: AMSSB-RSS-D(N) (H. Girolamo), Natick, MA 01760-5020 ABSTRACTThis program was part of DARPA's "Dog Nose" initiative to develop landmine detection technology based upon the chemical signature of the mine explosive charge. The focus of this DARPA-sponsored project was to exploit the exciting breakthrough technology developed recently at Caltech that forms the basis for a low power, simple , manufacturable "electronic nose." This nose-on-a-chip involves chemically sensitive resistors, whose signals reveal the identification and concentration of vapors in a fashion analogous to that of the mammalian olfactory system. This technology has been developed into a landmine detection system, based on the characteristic chemical signature of mines, that operates in real-time through a VLSI-compatible Si process.

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“…Sensor resistif didasarkan pada perubahan sifat konduksi listrik material sensor terhadap kelembaban, sedangkan sensor kapasitif didasarkan pada perubahan nilai kapasitansi material terhadap kelembaban [1]. Sensor kelembaban resistif biasanya menggunakan bahan-bahan oksida keramik seperti TiO 2 [2,3], sedangkan sensor kelembaban kapasitif menggunakan bahan-bahan polimer seperti PMMA [4].…”

Section: Pendahuluanunclassified

Pengembangan Probe Sensor Kelembaban Serat Optik Dengan Cladding Gelatin

Maddu¹,

Modjahidin²,

Sardy³

et al. 2010

MST

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AbstrakTelah dikembangkan probe sensor kelembaban menggunakan serat optik dengan cladding gelatin. Pada probe sensor kelembaban ini, cladding asli serat optik diganti dengan lapisan gelatin sebagai cladding sensitif kelembaban. Untuk menguji respon sensor serat optik yang dibuat, dilakukan pengukuran intensitas cahaya yang ditransmisikan pada probe serat optik untuk setiap variasi perlakuan kelembaban berbeda. Respon probe sensor serat optik ini diukur dari kelembaban 42% hingga 99% RH, hasilnya memperlihatkan kurva transmisi optik berbavariasi terhadap nilai kelembaban relatif (RH). Transmisi optik di dalam probe serat optik meningkat terhadap kenaikan nilai RH pada suatu rentang panjang gelombang spesifik, yaitu pada spektrum pita hijau hingga merah (500 nm -700 nm), dengan variasi signifikan pada rentang 600 nm sampai 650 nm atau dalam pita spektrum kuning hingga merah. Panjang gelombang dimana intensitas maksimum transmisi optik terjadi pada panjang gelombang 610 nm. Dengan demikian, probe sensor kelembaban serat optik ini dapat merespon kelembaban dari 42 %R hingga 99%H dengan respon terbaik pada rentang kelembaban 60%RH hingga 72%R yang memiliki linieritas dan sensitifitas yang cukup baik. AbstractDevelopment of Fiber-Optic Humidity Sensor Probe with Gelatin Cladding. Humidity sensor based on optical fiber with gelatin cladding has been developed. In this humidity sensor probe, the origin cladding of optical fiber is replaced by gelatin coating as humidity sensitive cladding. Testing of the optical fiber sensor probe was conducted by measuring of light intensity transmitted on the optical fiber probe for each variation of different humidity treatments. Response of the optical fiber sensor probe measured from 42%RH to 99%RH, the results show an optical transmission curve varied with relative humidity (RH). Optical transmission in the optical fiber probe increase with RH value at a specific wavelength range, that is from green to red spectrum bands (500 nm -700 nm), where a significant variation from 600 nm to 650 nm in yellow to red spectrum bands. Wavelength where is a maximum intensity of optical transmission occurs at 610 nm. Therefore, the optical fiber humidity sensor probe could response humidity form 42%RH to 99%RH with the best response in humidity range of 60%RH to 72%RH that is have a good linearity and sensitivity.

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Comparative performance of linear, cross-linked, and plasma-deposited PMMA capacitive humidity sensors

Cited by 38 publications

References 16 publications

Role of Cross-Linking Process on the Performance of PMMA

Role of Cross-Linking Process on the Performance of PMMA

A Conducting Polymer-Based Electronic Nose for Landmine Detection

Pengembangan Probe Sensor Kelembaban Serat Optik Dengan Cladding Gelatin

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