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Carbon fiber reinforced epoxy composites are of great interest in advanced components which require light weight and high thermal conductivity (TC). However, the epoxy-rich interlayer makes even highly thermal conductive mesophase pitch-based carbon fibers (MPCF) less effective in the out-of-plane direction. In this study, boron nitride (BN) particles are incorporated in MPCF/epoxy composites with...
A novel linear polyester with acid-labile β-thiopropionate groups was synthesized via the direct lipase-catalyzed polycondensation of methyl 3-((2-hydroxyethyl)thio)propanoate (MHETP) using immobilized lipase B from Candida antarctica (CALB). The influences of reaction conditions such as polymerization temperature and time on the molecular weight of the poly(β-thioether ester) (PTE) were studied....
Polyethersulphone (PES) is an important special engineering plastic. In order to broaden its applications in automobile and sports fields etc., its mechanical properties have to be enhanced. This paper reports the effectively enhanced tensile and flexural properties of injection molded graphene oxide (GO)-coated short carbon fiber reinforced PES composites by GO coating. The GO content varies in a...
In this paper we describe the fabrication of honeycomb-shaped polyurethane films from dendritic side-chain polymers presenting reactive pendent units. Two novel functional polyurethanes, poly(urethane-co-acylurea) (PU-PACY) and polyurethane-co-azetidine-2,4-dione containing polyurethane (PU-PAZ), were synthesized. The waxy dendrons featured focal urea/malonamide linkages favorable for hydrogen bonding...
Rational design and successful synthesis of a novel double side-chain liquid crystalline (SCLC) diblock copolymer bearing a common flexible polyether backbone were achieved via sequential anionic polymerization. The distinct differences in transition temperatures as well as phase ranges of the constituting blocks counterparts merited the full exploration of complex phase structures of the diblock...
Side-chain liquid crystalline (SCLC) polyethers with different spacers are successfully synthesized via anionic polymerization for the first time. The molecular weights of the polymers can range up to ∼53 kg/mol with M w /M n <1.1. The precise chemical structures including end groups have been characterized by employing Matrix-Assisted Laser Desorption/Ionization-Time of Flight...
A series of donor(D)-acceptor(A)-based polyfluorene derivatives, which contain carrier-transporting units of carbazole and oxadiazole as the substitutes of the C-9 position of fluorene and are end-capped with the red-emitting iridium bi(phenylisoquilonato)(picolinato) unit by unconjugated linkage, were synthesized and characterized. The molar ratios between the donor of carbazole and the acceptor of...
Several non-metallocene-type titanium(IV) complexes containing phenoxy-phosphine or thiophenoxy-phosphine ligands of type, (2-R 1 -4-R 2 -6-PPh 2 -C 6 H 2 X) 2 TiCl 2 (2a: X = O, R 1 = R 2 = t-Bu; 2b: X = O, R 1 = R 2 = cumyl; 2c: X = S, R 1 = SiMe 3 , R 2 = H) have been synthesized...
A series of novel half-metallocene-type titanium complexes CpTiCl 2 [PhNC(R 2 )CHC(R 1 )O] (2a, R 1 = Cy, R 2 = CF 3 ; 2b, R 1 = t Bu, R 2 = CF 3 ; 2c, R 1 = Ph, R 2 = CF 3 ; 2d, R 1 = Ph, R 2 = CH 3 ) have been synthesized by treating CpTiCl 3 with the corresponding...
The copolymerizations of ethylene with polar hydroxyl monomers such as 10-undecen-1-ol, 5-hexen-1-ol and 3-buten-1-ol were investigated by the vanadium(III) catalysts bearing bidentate [N,O] ligands (1, [PhNC(CH 3 )CHC(Ph)O]VCl 2 (THF) 2 ; 2, [PhNCHC 6 H 4 O]VCl 2 (THF) 2 ; 3, [PhNCHC(Ph)CHO]VCl 2 (THF) 2 ). The polar monomers...
Hyper-branched polyethylenimine grafted polycaprolactone block mono-methoxyl poly (ethylene glycol) copolymer (hy-PEI-g-PCL-b-mPEG) was obtained through the conjugation of mPEG–PCL with hyper-branched PEI (hy-PEI) based on the Michael addition. mPEG–PCL was synthesized by ring-opening polymerization of caprolactone using mPEG as the initiator. Compared earlier syntheses, this method offered a reduced...
Two types of new fluorinated diamine monomer, [1,4-(4-amino-2-trifluoromethyl-phenoxy)-2-(3′-trifluoromethylphenyl) benzene (III)] and [1,4-(4-amino-2-trifluoromethyl-phenoxy)-2-(3′-methylphenyl) benzene (IV)] were synthesized and polymerized with aromatic dianhydrides. A series of soluble poly(ether imide)s (PEIs) were prepared from the diamines and dianhydrides by two-step chemical imidization methods...
Curing kinetics and mechanism of liquid lignin based epoxy resin (LEPL)–maleic anhydride (MA) system accelerated with benzyldimethylamine (BDMA) were studied by Fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC). In order to investigate the difference in the curing process, heating FTIR was used to study the change of the functional group. Complete consumption...
Full atomistic molecular dynamics simulations have been used to study the diffusion of alkane molecule in single wall carbon nanotube (SWCNT), with different alkane chain lengths and nanotube diameters. In this paper, we calculated the self-diffusion coefficient, mean-square gyration and bond-orientation order parameter of alkane molecule and the average intermolecular interaction energy per segment...
Binary blend membranes of biodegradable poly(l-lactide) (PLLA) with poly(tetramethylene adipate-co-terephthalate) (PTAT) copolymer were prepared by solution casting via air evaporation. The miscibility of PLLA/PTAT blends was studied by dynamic mechanical analysis (DMA) and thermal mechanical analysis (TMA) in a tensile mode. Differential scanning calorimetry (DSC) measurement was carried out. The...
Fe(II) pyridinebisimine complexes activated with trialkylaluminium or modified methylaluminoxane (MMAO) as catalysts were employed for the polymerization of methyl methacrylate. Polymer yields, activities and polymer molecular weights as well as molecular weight distributions can be controlled over a wide range by the variation of the structures of the Fe(II) pyridinebisimine complexes and the reaction...
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