KM. MEENU, DIBYENDU S. BAG^*, REKHA LAGARKHA^a

Journal of Polymer Materials, Vol.36, No.3, pp. 275-292, 2019, DOI:10.32381/JPM.2019.36.03.7

Abstract Functional photoactive polysilane copolymers of poly(methylphenylsilane) (PMPS) and disperse yellow 7 methacrylate (DY7MA) were synthesized using UV-technique. In the same manner functional polysilane copolymers of poly(methylphenylsilane-co-dimethylsilane) (CPS) and disperse yellow 7 methacrylate (DY7MA) were also synthesized. By the UV irradiation polysilanes (PMPS and CPS) give rise to silyl macroradicals which initiate the polymerization of photoactive monomer (DY7MA). The synthesized samples were characterized by FTIR, NMR, and UV-Vis spectroscopy. The molar mass of synthesized photoactive functional polysilane copolymers is of order of 103 gm/mol. They exhibited multimodal optical and photoluminescence functional properties. Optical absorbance was observed at 336 nm due to… More >

MERYEM KORUYUCU^a, FEHMi SALTAN^a,b, GÖKHAN KÖK^a, HAKAN AKAT^a, YEŞIM SALMAN^a,*

Journal of Polymer Materials, Vol.36, No.3, pp. 207-216, 2019, DOI:10.32381/JPM.2019.36.03.1

Abstract The present study has demonstrated that novel acrylic glycopolymers are successfully prepared by using monosaccharides containing an acrylate group (9-12). For this purpose, sugar based acrylate monomers were synthesized via ring opening method (Method B) and homopolymerization of this sugar oxypropylacrylates was performed using free radical polymerization. The characterization of all the monomers and polymers were verified by ¹HNMR, ¹³CNMR, FTIR and GPC techniques. The Glass transition temperatures and thermal characteristics of the polymers were also analyzed by using DSC and TG techniques. The thermal stability of prepared polymers have changed with the stereochemistry of the carbohydrate moiety. Also, the… More >

AMRITA SHARMA, P. P. PANDE

Journal of Polymer Materials, Vol.36, No.2, pp. 175-194, 2019, DOI:10.32381/JPM.2019.36.02.6

Abstract ‘Comb-like polymers’ are a special class of polymers. These are consisting of two types of chains, first one is the backbone chain and second is long side chains. The structure of such a polymer is very similar to hair comb. Usually, every monomer unit in the backbone has a long n-alkyl side chain. Comb like polymers have an intrinsic ability towards forming ordered structure. Now-a-days, these polymers find wide range of applications because of their excellent physicochemical properties. Some applications are in preparation of polysoaps (polymeric disinfectants), as dispersing agent for ink and paints, textile industry, in surface modification of… More >

ZHIHUI HUANG¹, JIAMIAO CHEN¹, YANPING HUO¹, JINGWEI ZHAO²

Journal of Polymer Materials, Vol.38, No.3-4, pp. 257-269, 2021, DOI:10.32381/JPM.2021.38.3-4.7

Abstract The effect of the ether/keto ratios on the thermal properties, mechanical performances and crystallization behavior of the Poly(aryl ether ketone)s (PAEK) were investigated. A formula was proposed the estimate the melting temperatures of the PAEKs with high accuracy. Glass transition temperatures were affected by the ether/keto ratios and molecular weights, and were related with the brittle-tough transition of the PAEKs. Mechanical performances of tensile, impact, flexural and compressive strength decreased with the increase of ether/keto ratios, while elongation had a trend of increase. The non-isothermal crystallization curves exhibited well linearity when treated with Jeziorny’s model, and two crystallization processes were… More >

NEETU TRIPATHI, DIBYENDU S. BAG^*, MAYANK DWIVEDI

Journal of Polymer Materials, Vol.40, No.3-4, pp. 227-269, 2023, DOI:10.32381/JPM.2023.40.3-4.8

Abstract Over the last three decades, there has been considerable interest in the captivating mechanical properties displayed by auxetic materials, highlighting the advantages stemming from their distinct negative Poisson's ratio. The negative Poisson's ratio observed in auxetic polymeric materials is a result of the distinctive geometries of their unit cells. These unit cells, encompassing structures such as chiral, re-entrant, and rotating rigid configurations, are carefully engineered to collectively generate the desired auxetic behaviour. This comprehensive review article explores the field of auxetic polymeric materials, offering a detailed exploration of their geometries, fabrication methods, mechanical properties, and characterisation. The diverse applications of… More >

PRITI^1,*, RADHA SACHAN², ROLI PURWAR³

Journal of Polymer Materials, Vol.40, No.3-4, pp. 205-214, 2023, DOI:10.32381/JPM.2023.40.3-4.6

Abstract In current research work, we have studied the blending effect of non-mulberry silk fibroin (10% weight/volume basis) and gelatin (20% weight/volume basis) in formic acid. Several blends as SF10G0, SF2G8, SF3G7, SF5G5 and SF0G10 have been made and their rheological behaviour was investigated. The blend solutions were subjected to a steady shear rheological study in the variety of range of shear rates, namely 0.01–500 sec-1 and the viscosities of blend solutions were noticed to decrease in comparison to pure silk solution. The frequency sweep was employed in dynamic rheological tests to determine complex viscosity of these solutions from range of… More >

DIBYENDU S. BAG^*, SHILPI TIWARI, AKANSHA DIXIT, KM. MEENU

Journal of Polymer Materials, Vol.40, No.1-2, pp. 105-123, 2023, DOI:10.32381/JPM.2023.40.1-2.9

Abstract In this paper, we report the microstructural investigation and influence of H-bonding on the thermal behavior e.g., glass transition (T_g ) and thermal degradation of chiral copolymers of (R)- N-(1-phenyl-ethyl) methacrylamide (R-NPEMAM) and 2-hydroxy ethyl methacrylate (HEMA). The T_g increases with the increase of chiral unit content in the copolymers and then attains optimum at around 25 mole % of chiral content. Thereafter it decreases with the increase of chiral content. The effect of copolymer composition and secondary interaction associated with the Hbonding on the thermal properties of these copolymers was also studied. Secondary interaction, specifically H-bonding has been interpreted… More >

Hao Hu^1,2,3, Jian Guan⁴, Shanfa Tang^1,2,3,*, Jialuo Rong^1,2,3, Yuanpeng Cheng^1,2,3

FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.2, pp. 325-335, 2024, DOI:10.32604/fdmp.2023.042055

Abstract Different drilling fluid systems are designed according to mineral composition, lithology and wellbore stability of different strata. In the present study, the conversion of a non-dispersed polymer drilling fluid into a low potassium anti-collapsing drilling fluid is investigated. Since the two drilling fluids belong to completely different types, the key to this conversion is represented by new inhibitors, dispersants and water-loss agents by which a non-dispersed drilling fluid can be turned into a dispersed drilling fluid while ensuring wellbore stability and reasonable rheology (carrying sand—inhibiting cuttings dispersion). In particular, the (QYZ-1) inhibitors and (FSJSS-2) dispersants are used. The former can… More >

Henky Muljana^*, Ivana Hasjem, Merianawati Sinatra, Dicky Joshua Pesireron, Michael Wilbert Puradisastra, Ryan Hartono, Kevin Yovan Hermanto, Tony Handoko

Journal of Renewable Materials, Vol.11, No.12, pp. 4039-4060, 2023, DOI:10.32604/jrm.2023.031261

Abstract This research paper describes the synthesis of thermo-reversible cross-linking of sago starch by grafting a furan pendant group (methyl 2-furoate) onto the starch backbone, followed by a Diels-Alder (DA) reaction of the furan functional group with 1,1′-(methylenedi-4,1-phenylene) bismaleimide (BM). The proof of principles was provided by FTIR and ¹H-NMR analyses. The relevant FTIR peaks are the carbonyl peak (υ C=O sym) at 1721 cm⁻¹ ; the two peaks appeared after DA cross-linking, i.e., at 1510 cm⁻¹ (corresponding to υ CH=CH BM aromatic rings, stretching vibrations), and at 1173 cm⁻¹ (assigned to cycloadduct (C-O-C, δ DA ring)) while the ¹H-NMR result… More > Graphic Abstract

Yuhui Huang¹, Zhiyuan Yin^1,2, Ming Liu¹, Meng Li¹, Yingfeng Zuo¹, Yan Qing¹, Yiqiang Wu^1,*

Journal of Renewable Materials, Vol.11, No.9, pp. 3417-3431, 2023, DOI:10.32604/jrm.2023.028511

Abstract The poor bonding performance between aqueous adhesives represented by melamine-urea formaldehyde (MUF) resins and reed straw hinders their applications in the field of non-wood-based panels. Multi-hydroxyl polymers are highly reactive and are often used as crosslinkers. This study fabricated a resin with a strengthened cross-linked structure by combining a multi-hydroxyl polymer and MUF resin prepolymer. The reed particleboard was prepared by using this resin as an adhesive and reed stalk as the matrix. The results show that neighboring molecules combined to form C–O–C bonds that strengthened the cross-linked structure of the resin. In addition, the viscosity of the resin was… More >