Synthesis and thermal properties of poly(methyl methacrylate)‐poly(<scp>L</scp>‐lactic acid)‐poly(methyl methacrylate) tri‐block copolymer

Shen, Jun; Jiang, Wei; Liu, Ying; Wei, Rongqing; Liu, Xiaoning; Zhong, Yu; Xu, Jie; Li, Linling; Xue, Gi

doi:10.1002/app.35503

Cited by 5 publications

(7 citation statements)

References 30 publications

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“…When compared curves a and b, the notable difference between them is the strong absorption peak at 1370 cm −1 , which corresponding to stretching vibration of v BO. Another difference is that there are two weak absorption peaks at 890 cm −1 and 677cm −1 in curve a, which corresponds to stretching vibration of v BOSi and in‐plane shear vibration of δ BOSi, respectively . These results suggest that boron atom has been successfully doped into the silicone resin chain in the form of SiOB bond by the method of hydrolysis‐polycondensation …”

Section: Resultsmentioning

confidence: 97%

Synthesis and thermal stability properties of boron‐doped silicone resin

Hao

Zhang

et al. 2014

J of Applied Polymer Sci

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In this article, a novel boron‐doped silicone resin (BSR) was synthesized by hydrolysis‐polycondensation method, with propyl‐triethoxysilane (PTES), dimethyl‐diethoxysilane (DMDES), and boric acid (BA) as starting materials, using absolute ethyl alcohol as solvent and hydrochloric acid as catalyst. The structures of the BSR were characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), X‐ray photoelectron spectroscopy (XPS), and gel permeation chromatography (GPC). FTIR spectra showed characteristic BOSi and SiOSi stretching modes. XPS and NMR results confirmed further that boron element was doped successfully into the main chains of the silicone resin as SiOB bond motifs, and hydroxyl groups from BA were condensed properly with SiOH or SiOR to form cross‐linked structure of BSR with narrowed molecular weight distributions in optimum experimental condition. The thermal stability of the BSR was studied by thermogravimetry analysis and derivative thermogravimetry. The thermal degradation temperature of the silicone resin improved greatly after doping element boron into the main chain, and the thermal stability of the BSR was influenced by the content of boron. The thermal degradation mechanism of this BSR was also discussed. The degradation process can be divided into two stages, the weight loss in the first stages may be corresponding to the loss of the small groups and weaker bonds in the chains, such as CH3, and C3H7, the weight loss in the second stage may be corresponding to the loss of the group as OC2H5. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40934.

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Section: Resultsmentioning

confidence: 97%

Synthesis and thermal stability properties of boron‐doped silicone resin

Hao

Zhang

et al. 2014

J of Applied Polymer Sci

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“…This approach was also used to synthesize BAB copolymers with a polycaprolactone (PCL) central core and PDMAEMA outer blocks 34,35 and with a PLLA central core and poly(methyl methacrylate) (PMMA) outer blocks. 36 Preparation of Thick Films and Isothermal Crystallization in the POM Hot Stage. Films of 2−3 μm in thickness, denoted as thick films, were prepared by drop-casting 10 mg/mL copolymer solutions in CHCl 3 onto glass slides that had been cleaned with a freshly prepared piranha solution (1 mL of 98% H 2 SO 4 + 1 mL of 30% H 2 O 2 ).…”

Section: ■ Introductionmentioning

confidence: 99%

PLLA Crystallization in Linear AB and BAB Copolymers ofl-Lactide and 2-Dimethylaminoethyl Methacrylate

et al. 2016

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Well-defined poly(L-lactide-b-2-dimethylaminoethyl methacrylate) (PLLA-b-PDMAEMA) linear AB block copolymers and BAB block copolymers with PLLA as the central block (PDMAEMA-b-PLLA-b-PDMAEMA) were synthesized by combined ring-opening polymerization and atom transfer radical polymerization. Molar masses of the PLLA block vary from 13K to 19K and the PDMAEMA block from 5K to 35K. Thermal properties, morphology, and crystallization kinetics of the copolymers were analyzed for crystallization conducted in the bulk, in thick and thin films, and in solution as well as for a limited number of stereocomplexes of diblock and triblock copolymers with poly(D-lactide) in thin films and of partially quaternized diblock copolymers. In the bulk, it is shown that crystallization rates are reduced and morphologies disordered when adding a PDMAEMA block to PLLA; these tendencies are more pronounced in the triblock compared to diblock copolymers of the same PDMAEMA content. Usually, G, the local growth rate, and K, the overall growth rate, vary in the same direction (with temperature or PDMAEMA content): the addition of a PDMAEMA block decreases both G and K more or less similarly. However, an inverse effect is seen upon quaternization: G decreases (slightly) as expected, due to the decreased mobility of the molecules, but K still increases due to the formation of a larger number of nuclei in the system. This antagonist effect between G and K is also seen, to a smaller extent, when comparing diblock and triblock copolymers. For the same PDMAEMA content, G is smaller in the triblock polymer while K remains almost constant, again compensating the decrease of G, by the creation of more nuclei. In terms of morphology, crystallization in thin films (30 nm) and in solution leads to single crystals that are more disordered (or distorted) for the triblock copolymers than for the diblock copolymers. The addition of PDLA homopolymer also leads to single crystals in thin films with the diblock as well as the triblock copolymers. If the enantiomeric compositions lead to hexagonal-shape crystals in blends with diblock copolymers, whereas nonenantiomeric compositions give triangular-shape crystals, the stereocomplexes involving triblock copolymers also give triangular-shape crystals even at enantiomeric compositions; an excess of copolymer is needed to regenerate the hexagonal single crystals.

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“…[31][32][33] The absorption band at around 677 cm -1 corresponds to stretching vibration of B-O-Si. [34][35][36] This result suggests that boron atom has been successfully doped into the silicone resin chain in the form of Si-O-B bond by the method of hydrolysis-polycondensation. The characteristic absorption peaks of KH550 are not obvious in curve B because of trace amount of KH550 existing in Qf/BSR-KH550 composites.…”

Section: Resultsmentioning

confidence: 88%

Effect of Surface Modification on Mechanical Properties of Quartz Fiber Reinforced Boron Doped Silicone Resin Composites

Yu¹,

Pei²,

Chen³

2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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Abstract. 3-triethoxysilylpropylamine (KH550) polymer was coated on quartz fibers by a simple dipping process without any complex chemical treatments in order to increase the bonding strength between quartz fibers and boron doped silicone resin matrix. The effect of coating on the interface of quartz fiber reinforced composites was evaluated by scanning electron microscope (SEM), FTIR, DTA-TG and flexural strength of unidirectional composites. Results indicated that the coating played an important role in improving the interfacial adhesion and thermal stability of quartz fibers composites. The FTIR result showed that Si-O-B bonds in silicone resin chain decomposed when the heat treatment temperature increased to 500. The composites with KH550 coatings exhibited better ℃ room temperature and high temperature flexural strength than those of the composites without KH550 coatings.

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Synthesis and thermal properties of poly(methyl methacrylate)‐poly(L‐lactic acid)‐poly(methyl methacrylate) tri‐block copolymer

Cited by 5 publications

References 30 publications

Synthesis and thermal stability properties of boron‐doped silicone resin

Synthesis and thermal stability properties of boron‐doped silicone resin

PLLA Crystallization in Linear AB and BAB Copolymers ofl-Lactide and 2-Dimethylaminoethyl Methacrylate

Effect of Surface Modification on Mechanical Properties of Quartz Fiber Reinforced Boron Doped Silicone Resin Composites

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