JP2005036240A - 分子量分布の狭いスチレン系共重合体の製造方法 - Google Patents
分子量分布の狭いスチレン系共重合体の製造方法 Download PDFInfo
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- JP2005036240A JP2005036240A JP2004274768A JP2004274768A JP2005036240A JP 2005036240 A JP2005036240 A JP 2005036240A JP 2004274768 A JP2004274768 A JP 2004274768A JP 2004274768 A JP2004274768 A JP 2004274768A JP 2005036240 A JP2005036240 A JP 2005036240A
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- styrene
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Abstract
【解決手段】以下の要件を満足することを特徴とするスチレン系共重合体および安定なニトロオキサイド系ラジカル化合物とラジカル重合用開始剤とから得られる化合物存在下で、スチレンおよび他の不飽和単量体をラジカル重合して前記スチレン系共重合体を得る方法。
(1) ゲルパーミェーションクロマトグラフ法(以下GPCという)により測定されるポリスチレン換算分子量において、重量平均分子量が3000〜100000の範囲である。
(2) GPCにより測定されるポリスチレン換算分子量において、重量平均分子量/数平均分子量が1.1 〜1.3 の範囲である。
(3) 共重合体中に、スチレン及びスチレン誘導体を30〜99モル%およびその他の不飽和単量体の中から選ばれる1種または2種以上を1〜70モル%含む。
【選択図】なし
Description
[1]全ての重合開始剤が同時に重合反応を開始すること
[2]ポリマー生長末端が停止反応、連鎖移動反応などを起こさないこと
[3]開始剤由来でない重合(熱重合など)を起こさないこと
[1]ラジカル重合開始剤としてベンゾイルパーオキサイド、安定なフリーラジカル化合物として2,2,6,6−テトラメチル−1−ピペリジニルオキシを用い、アクリル酸エチルやアクリロニトリルなどの単独重合を重合温度125℃において行った場合、ポリマーは得られず、上記のM−Y結合の解裂が起こらないと推定された。
[2]ラジカル重合開始剤としてベンゾイルパーオキサイド、安定なフリーラジカル化合物として2,2,6,6−テトラメチル−1−ピペリジニルオキシを用い、第一段目の反応としてスチレンの単独重合を重合温度125 ℃において行い、その後、反応系内にアクリル酸エチルを添加しブロック化を検討したところ、重合時間の経過に伴う重量平均分子量の増加分は初期にアクリル酸エステル単位30〜40個程度を付加したところで停止してしまうことを見いだした。これは、第一段目の反応後の分子鎖末端である(スチレン)−Y間の結合が熱的に解裂し、生成したポリマーラジカル末端にアクリル酸エチルが一回の解裂の際に30〜40個付加し、その後Y・が末端と再結合するが、(アクリル酸エチル)−Y間の結合が解裂しないため、重合がそこで停止してしまうことによると推定された。
(1) ゲルパーミェーションクロマトグラフ法(以下GPCという)により測定されるポリスチレン換算分子量において、重量平均分子量が3000〜100000の範囲である。
(2) GPCにより測定されるポリスチレン換算分子量において、重量平均分子量/数平均分子量が1.1 〜1.3 の範囲である。
(3) 共重合体中に、スチレン及びスチレン誘導体を30〜99モル%およびその他の不飽和単量体の中から選ばれる1種または2種以上を1〜70モル%含む。
[1]−(スチレン)−(スチレン)−Y
[2]−(スチレン)−(アクリル酸エステル)−Y
[3]−(アクリル酸エステル)−(スチレン)−Y
[4]−(アクリル酸エステル)−(アクリル酸エステル)−Y
このうちの[1]、[3]については(スチレン)−Y間の結合の解離が起こり、分子量分布の狭いポリマーが得られる場合の生長末端と同一であり、目的とする重合形態で重合が進むと考えられる。これに対して[2]については本来は目的とする重合形態で重合が進まないと考えられるが、実際には分子量分布の狭いコポリマーが生成していることから、生長末端の一つ前のモノマーの影響(前末端効果)を受け、[1]、[3]と同様な重合形態で重合が進んだものと推定される。[4]については目的とする重合形態で重合が進まないので分子量分布を狭くすることは困難であるが、このような生長末端については、(末端スチレンポリマーラジカル数)/(全ラジカル数)>0.8を満たすような条件下で重合を行うことにより生成を回避できる。末端スチレンポリマーラジカル数及び全ラジカル数は、スチレン(ST)とアクリル酸エステル(EA)の共重合の場合、以下の式により得られる。
(末端スチレンポリマーラジカル数)=rST ・fST /k11
(全ラジカル数)=rST ・fST /k11 + rEA ・fEA /k22
(式中、rST, rEAはSTとEAの共重合の場合のそれぞれの反応性比、fST, fEAはそれぞれの仕込み量、k11, k22はそれぞれの単独重合速度定数を指す)
(1)数平均分子量、重量平均分子量、重量平均分子量/数平均分子量:試料10mgをテトラヒドロフラン20ccに溶解し、GPC-LALLS 装置低角度光散乱高度計LS-8000 (東ソー株式会社製、テトラヒドロフラン溶媒、リファレンス:ポリスチレン)で測定した。また、重量平均分子量/数平均分子量(Mw/Mn )は、得られた数平均分子量(Mn)と重量平均分子量(Mw)から求めた。
(2)重合率:GPCにより検量線を作成し、残存モノマー量を測定して求めた。
(3)共重合組成の決定:13C-NMR により組成を決定した。
Claims (1)
- 安定なニトロオキサイド系ラジカル化合物が有するラジカル量/ラジカル重合用開始剤から発生するラジカル量がモル比で0.9 〜1.3 の割合で混合・加熱して得られた化合物存在下で、スチレンおよび他の不飽和単量体を重合温度100 〜180 ℃の範囲においてラジカル重合を行い得られることを特徴とする、
以下の要件を満足することを特徴とするスチレン系共重合体の製造方法。
(1) ゲルパーミェーションクロマトグラフ法(以下GPCという)により測定されるポリスチレン換算分子量において、重量平均分子量が3000〜100000の範囲である。
(2) GPCにより測定されるポリスチレン換算分子量において、重量平均分子量/数平均分子量が1.1 〜1.3 の範囲である。
(3) 共重合体中に、スチレン及びスチレン誘導体を30〜99モル%およびその他の不飽和単量体の中から選ばれる1種または2種以上を1〜70モル%含む。
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