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제안 방법
- For the development of flame-retardant PBT incorporated with non-halogen compound, in this study, we synthesized a phosphorus comonomer [(6-oxido-6H-dibenz oxaphosphorin-6-yl)methyl]-methyl butanedioate (DOP- MBDA) which does not produce water during the polymeri zation reaction and prepared a series of novel flame retar dant PBTs (FR-PBTs) using this comonomer.
- The reaction mixture was main tained at this condition for 2 hrs to obtain FR-PBTs. The contents of DOP-MBDA in FR-PBTs prepared were 5.5, 8, 10, and 15 wt%. The synthetic route used to prepare the DOP-MBDA comonomer and the typical preparation con ditions of FR-PBT are shown in Scheme I and Table I, respectively.
대상 데이터
- Limited oxygen index (LOI) measurements were performed on the CS-108B instrument from CSI Company. The polymer samples were molded to a size of 100 mm in length, 6.5 mm in width, and 3 mm in thickness. The LOI measurement was performed according to ASTM D2863-1991.
이론/모형
- 5 mm in width, and 3 mm in thickness. The LOI measurement was performed according to ASTM D2863-1991.
- The UL-94 V test was performed according to the UL-94 V standard method with a test specimen of 125 mm in length, 13 mm in width, and 1.6 or 3.2 mm in thickness. Five sample bars suspended verti cally over surgical cotton were ignited by a Bunsen burner; two ignitions with burning times of 10 sec each were applied to each sample bar.
- Differential scanning calorimetry (DSC) data were obtained from 8-15 mg samples in a nitrogen atmosphere at a heating rate of 20°C/min using a Perkin Elmer 7-Series differential scanning calorimeter. The tensile properties of the polymers were measured according to the ASTM D 638 using a Model 4303 Instron from Instron Company. The flexural strength and modulus of the poly mers were measured according to the ASTM D 790 and the impact strength of the polymers was measured following the ASTM D 256 method with ASTM standard samples of the polymers.
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